Re: Multiple Questions from a SysAdmin
Bryan Berry wrote: 2. Does Avahi work together w/ Telepathy (local mesh) and EJabber (multiple meshes) for the presence service? If so, how? There are two modes for collaboration: link local (mesh) or server (Jabber). Link local uses telepathy-salut, which uses avahi (multicast) to announce presence and shared activities. Server uses telepathy-gabble, which uses loudmouth to connect to the jabber server (unicast). See http://wiki.laptop.org/go/Shared_Sugar_Activities, http://wiki.laptop.org/go/Presence_Service and http://wiki.laptop.org/go/Category:Collaboration for current wiki documentation. Feel free to ask further questions - the documentation is a work in progress... I would appreciate if someone could point me to a good resource to learn more about how avahi works. I have only found a little bit of info about it on the web. Or does it simply handle network interface configuration? 3. What aspects of the mesh does Jabber enable that aren't there by default? At this point, scalability. We should handle presence and collaboration for 100+ XOs on the jabber server, but on link local mesh there are issues with saturation, and also multicast not working with the aggressive suspending. 4. When I turn on an XO it always shows Mesh Networks 1, 6, and 11 even if there are no other XO's around. Why is this? I have always presumed that Network 1 was the XO's own instance of the mesh in case it didn't see a school server. But what about the other two? That's a UI feature, to allow you to select those wifi channels. It doesn't mean there is anything on them. It's possible to run some XOs on each channel, although they will only see those on their channel. Regards Morgan ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: storing Activity parameters
On Sun, Mar 2, 2008 at 1:51 PM, Gary C Martin [EMAIL PROTECTED] wrote: I'm having some indecision about my own (very simple) activity state saving. Just had a though that may add another possibility to this thread. What if both journal and file-system were used to store the activity state, with the journal settings overriding the file-system settings. This way a new activity start-up could inherit the last used activity settings, and a specific journal start-up would inherit the settings used for that specific entry. So in the case of Speak I could have separate favourite journal entries for '3 eyed alien' and another for 'Mr square eyes', then if I also just started the activity from fresh I'd pick-up whatever the last used setting were (picked up from the FS). I like this idea a lot. Thanks for sharing. [...] On 2 Mar 2008, at 01:29, Joshua Minor wrote: I implemented the save/load feature of Speak without fully understanding the other options. Now that I've seen the recent discussion about data vs instance vs the journal I think it would make more sense to have Speak save its state in a different way. On the other hand, the new frame redesign makes it much easier to resume an Activity, which would mean that parameters saved to the Journal, like Speak does now, would naturally be restored when you resume the Activity. A nice best practices document would be very handy. Yeah, storing some settings both in the fs and in the datastore would be suggested by these best practices document. Any activity author would like to start it? I'm sure many interesting discussions will come from this effort. Thanks, Tomeu ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Multiple Questions from a SysAdmin
1. How can I cryptographically sign my own custom NAND image? We will need to do custom images for our pilot. For example, we need to include the Nepali activities we have built, Gcompris, and SocialCalc, that are not part of the standard build. The 6th graders at our pilot schools will require a different image than the 2nd graders. I have looked at the wiki page on building custom images and it looks fairly difficult. http://wiki.laptop.org/go/Building_custom_images Is there a way to cheat hard labor by using nandwrite or nanddump to simply copy customized image from an existing XO to a blank USB key? First get into the usb. I think U: stands for usb drive. Then you can simply use nand-copy and nand-save commands to do that. 4. When I turn on an XO it always shows Mesh Networks 1, 6, and 11 even if there are no other XO's around. Why is this? I have always presumed that Network 1 was the XO's own instance of the mesh in case it didn't see a school server. But what about the other two? Just to add a few points: channel 1,6,11 are used by the mesh. These are the three channels with least overlap. I guess we can associate a XO with one of them to always look at that channel first. All three appear even though thre is no mesh associated with it. - talk to you later sulochan ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Server-devel] Testing 200 XO's in two weeks time for Nepal's pilot
[EMAIL PROTECTED] wrote on 03/03/2008 02:38:00 AM: Questions: How many XO's can a single active antenna support? We only have two active antennas at the moment. The answer is always traffic depedent. Given the current status of the collaboration software on the XO and assuming that the school server's ejabberd works correctly (shutting off multicast traffic on the XOs), you should be able to put 30-40 laptops per active antenna. You should always keep in mind that in dense deployments (classrooms), mesh is sub-optimal compared to standard access points (assuming that every XO can talk to the AP). That is because, you have all the path discovery control traffic overhead in mesh mode that you don't have in infrastructure mode. Should we buy extra regular access points to back up our active antennas? Again, would love to know if particular AP is preferred and how many XO's one can support. I read in the devel list today that the WRT54G is not preferred. Yes, if you can afford them, APs will give you much better performance in schools. The issue with the stock firmware in the WRT54Gs is that it tries to establish WDS peer links with every other WDS capable node in the vicinity. So if you have a few of them in a school, you can end up with multiple WDS tunnels between them. Add to that the multicast traffic from the XOs and you end up with no spectrum at all, due to multicast/broadcast retransmissions. The solution to that problem is to be able to turn off WDS. The stock Linksys firmware doesn't do it, however OpenWRT and its variants can do it. So the answer to whether you should/can use WRT54Gx APs is only if you can upgrade them to an OpenWRT variant. We are working on HostAP support for the active antennas, so that for small schools, the school server is all that you need. In the meantime, APs with controllable WDS behavior are recommended. We will have two pilot schools. One w/ 110 students and the other w/ 50 students. I would use 3 APs on the first and two on the second. In the future 2 and 1 will suffice, however as of now we are wasting a lot of airtime in all layers of the network stack. M. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Today's mesh testing.
Great! Thanks for the update, Chris. Kim On Sun, Mar 2, 2008 at 7:05 PM, Chris Ball [EMAIL PROTECTED] wrote: Hi, Daf and I got the school server jabberd/shared roster working today. We connected/registered 32 laptops to it with mesh TTL set to 1 for broadcast, and they were all able to see and join a shared chat session with each other. The workload on the spectrum analyzer increased from 18% (no-one connected) to 26% (all connected). The chat session is consistent -- no-one is dropping out and new messages are seen by each laptop, with a few seconds of lag. With the mass chat session still running, we shared a 500KiB PDF. First we joined the shared Read session with one laptop, and the download took 16 seconds to complete. We then joined two more laptops at once, the first download took 26 seconds and the second finished at 30 seconds. Five more at once: all finished around 1m00s. Ten more at once: the first finished at 2m18s, the last finished at 2m40s. There were no failures downloading the PDF. The sharing was unicast TCP, with mesh TTL set to 1, which explains the slightly worse than linear increase in download time for more laptops downloading at once. This is much more anecdotal than the full test plan, but we thought the testers currently in Peru would want to know what they can expect from the school server setup ASAP. We don't have more laptops upgraded and ready to join the network yet, but we don't have any reason to believe we've saturated the network -- with the PDFs downloaded and Chat still running, the duty cycle on the spectrum analyzer is now at 28%. (In general, wireless networks seem to start degrading around 40%.) - Chris and Daf. -- Chris Ball [EMAIL PROTECTED] ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Today's mesh testing.
Wonderful stuff! - Jim On Sun, 2008-03-02 at 19:05 -0500, Chris Ball wrote: Hi, Daf and I got the school server jabberd/shared roster working today. We connected/registered 32 laptops to it with mesh TTL set to 1 for broadcast, and they were all able to see and join a shared chat session with each other. The workload on the spectrum analyzer increased from 18% (no-one connected) to 26% (all connected). The chat session is consistent -- no-one is dropping out and new messages are seen by each laptop, with a few seconds of lag. With the mass chat session still running, we shared a 500KiB PDF. First we joined the shared Read session with one laptop, and the download took 16 seconds to complete. We then joined two more laptops at once, the first download took 26 seconds and the second finished at 30 seconds. Five more at once: all finished around 1m00s. Ten more at once: the first finished at 2m18s, the last finished at 2m40s. There were no failures downloading the PDF. The sharing was unicast TCP, with mesh TTL set to 1, which explains the slightly worse than linear increase in download time for more laptops downloading at once. This is much more anecdotal than the full test plan, but we thought the testers currently in Peru would want to know what they can expect from the school server setup ASAP. We don't have more laptops upgraded and ready to join the network yet, but we don't have any reason to believe we've saturated the network -- with the PDFs downloaded and Chat still running, the duty cycle on the spectrum analyzer is now at 28%. (In general, wireless networks seem to start degrading around 40%.) - Chris and Daf. -- Jim Gettys One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [sugar] Journal: two quick suggestions
On Fri, Feb 29, 2008 at 11:56 AM, Tomeu Vizoso [EMAIL PROTECTED] wrote: On Fri, Feb 29, 2008 at 5:17 PM, Christoph Derndorfer [EMAIL PROTECTED] wrote: One can imagine that the subject of an activity is actually subjectively defined, and even when it's relatively clear, we might wind up with some for each of math, geometry, trigonometry, algebra, etc. To make a similar functionality available, though, we've chosen to allow developers to supply a list of tags within the .info file for any given activities, which could include several subject related words, as well as more abstract or general terms like game, simulation, or language. We hope that the ability to search by broad terms such as math or games will then turn up a list of appropriately related activities. Having just typed this and then reviewing the wiki, I notice that this part of the spec doesn't appear to be there yet! Can those familiar with this respond about the presence or absence of this capability? If this isn't there, it should get a ticket. It should be a pretty straightforward addition and simple to implement, it seems. Ahhh, that's indeed interesting, I hadn't been aware of this functionality before... Per Eben's question: Does anyone happen to know whether this is already implemented or not? Don't think that the implementation of this has been discussed before. Eben, can you enter a ticket pointing to a spec? I now see that this was never given a ticket, but has been hidden in the HIG since the early days. I've opened ticket #6634 on the subject, generalizing it as a way for content providers to tag any bundle as appropriate. - Eben ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [PyCON-Organizers] event scheduling: Board Game Social room and time.
On Sun, Mar 2, 2008 at 4:41 PM, DeanG [EMAIL PROTECTED] wrote: While the notes are open getting the Lab setup, can I ask for a recommendation on a designated room for the Board Game Event? Based on interest this year I don't expect needing a large room, especially as overflow can move to other open spaces. Can we set up some XOs for people to play networked board games on? See http://wiki.laptop.org/go/Games for the current selection. As far as time, I understand the event will be the same tme as the Open Spaces on Friday and Saturday. I don't see this on the schedule. When are the Open Spaces sheduled? Thanks, Dean ___ Pycon-organizers mailing list [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/pycon-organizers -- Edward Cherlin End Poverty at a Profit by teaching children business http://www.EarthTreasury.org/ The best way to predict the future is to invent it.--Alan Kay ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: WDS problems observed in today's testing
These were WRT54GL's running OpenWRT, just to ask the exact configuration? Note that (the last I heard) some of the newer WRT54G's have too little RAM to run OpenWRT, which is why the WRT54GL model was introduced, IIRC. - Jim On Mon, 2008-03-03 at 16:47 +1030, Kim Hawtin wrote: Javier Cardona wrote: What I recall is 50% duty cycle and a channel grade of 22/100. The channel grade takes into account not only the duty cycle but also the noise floor. I did not re-check those numbers after turning the AP off, but there was a drastic improvement of the channel energy profile. The limit of concurrent users for a low-end AP like the WRT54G is ~30. these APs are capable of ~65 concurrent users. at linux.conf.au this year we had associated clients regularly hitting over 60 clients *per* WRT54GL. we had about 25 installed around the venue. the maximum associated clients we saw on one AP was 68. we were using the default install of OpenWRT 7.09. But in the capture we see that the AP is wasting most of its time transmitting WDS frames at low rates. That is very likely to be the reason why we could not get more than 17 laptops associated. regards, Kim ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Jim Gettys One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [OLPC Networking] Issues with the wireless mesh devices
Kim wrote: ...The network admin guys are quiet concerned about the DDOS possibilities. I comment, Hi Kim, I am very intested in the networking issue... because I am mounting a small lab to emulate the enviroment of the XOs Acces Point wireless work... About DDOS: At the end of this message the definition of a DDOS (distributed Denial of Service Attack... for those that need to know) Comments: a) DDOS is possibe ONLY if you are connected to the Internet (technically is possible in any enviroment, but lets analyze the most possible common source of problems). b) I imagine the next scenary: 1) Only the School Server (if exists) will be directly connected to the Internet 2) The XOs will have private address, not public internet address. So only the School Server is available for a DDOS. This lead us to 2 other possibilities: I) The S.Server is directly connected to the Internet by... (wich provider? VSAT? wich service?) II) The S.Server is getting the Internet from a tunnel that connects the S.Server with the OLPC foundation Internet connection. III) The S.Server is connected to the Internet by local connections to local internet providers, directly. The S.Server has its own public IP. IV) The S.Server use a dial up to connect to the Internet. Each time it dials the S.Server gets a dynamic public IP address (that comes from a pool that the Internet service provider will assign). The S.Server is a server for the XOs... not a server for the Internet. If you want to deploy an Internet Server and get rid of the problems with DDOS then you can hire (or the OLPC can provide) space in their servers to mount any server service (!) that a kid in Peru (bravo!) want to mount and put at the service of the whole world (super bravo! here we come, naked internet at the root... are coming back to the 80's??? sorry... it is a dream... dangerous dream!) IV) The S.Server is connected to the Internet by other methods, like a USB mule (since I am in Peru I will call it from this moment a USB llama !!!) Each of this scenary can be build with some protection against DDOS (and nothing is perfect), and using NATs will put the responsability of working against DDOS (a daily task, permanent) in the hands of the people/team/company that provide the first internet public ip address in the other side of the NAT. Each of this options (I to V) has its own ways to work against DDOS. I don't think that the network admins should be too worry about DDOS because depending on the networking design this should not be a problem at all. If someone can tell me what is the official network design in this moment, then I can analyze more this DDOS possibility and tell more about measures to avoid. Best regards, Javier Rodriguez Lima, Peru - distributed denial-of-service attack DEFINITION - On the Internet, a distributed denial-of-service (DDoS) attack is one in which a multitude of compromised systems attack a single target, thereby causing denial of service for users of the targeted system. The flood of incoming messages to the target system essentially forces it to shut down, thereby denying service to the system to legitimate users. A hacker (or, if you prefer, cracker) begins a DDoS attack by exploiting a vulnerability in one computer system and making it the DDoS master. It is from the master system that the intruder identifies and communicates with other systems that can be compromised. The intruder loads cracking tools available on the Internet on multiple -- sometimes thousands of -- compromised systems. With a single command, the intruder instructs the controlled machines to launch one of many flood attacks against a specified target. The inundation of packets to the target causes a denial of service. While the press tends to focus on the target of DDoS attacks as the victim, in reality there are many victims in a DDoS attack -- the final target and as well the systems controlled by the intruder. http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci557336,00.html - Kim Hawtin wrote: Forwarding due to the quietness over on [EMAIL PROTECTED] =) Kim Hawtin wrote: Is this the correct forum to post questions around the wireless mesh devices? I took an XO to a community wireless[1] monthly meeting this week. We had a number of problems with other wireless devices, we believe directly related, to the XO being turned on, then stopped when the XO was turned off. I purchased some kit the same as in the APs that we use and hope to either confirm or discount the XO as the culprit. The network admin guys are quiet concerned about the DDOS possibilities. The access point is a Alix router board with a pair Atheros wireless minipci NICs. Here is a snippet from the log on the host; ath1: device timeout ath1: hardware error;
Re: [OLPC Networking] Issues with the wireless mesh devices
Are there any tools that I can use to determine whats going on here? I noticed there was a wireshark patch is that for the XO itself? Yes, capturing traffic and analyzing in wireshark is a good way to understand what is going on. The patch you mentioned will help wireshark in decoding and displaying the mesh traffic properly. Could you make this capture files available? -- Ricardo Carrano ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: WDS problems observed in today's testing
Jim, On 3/3/08, Jim Gettys [EMAIL PROTECTED] wrote: These were WRT54GL's running OpenWRT, just to ask the exact configuration? Not sure if it was a WRT54G or WRT54GL, but I'm certain that it was running the original Linksys firmware. Javier -- Javier Cardona cozybit Inc. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: WDS problems observed in today's testing
I believe it is a WRT54Gv8 model (which, btw has not enough memory to run some of the openwrt variants around). It is brand new AP (bought it at BestBuy) with stock LInksys firmware. It is still at 1cc (I brought another (same model) with me so not to disturb the tests in place). On Mon, Mar 3, 2008 at 3:22 PM, Javier Cardona [EMAIL PROTECTED] wrote: Jim, On 3/3/08, Jim Gettys [EMAIL PROTECTED] wrote: These were WRT54GL's running OpenWRT, just to ask the exact configuration? Not sure if it was a WRT54G or WRT54GL, but I'm certain that it was running the original Linksys firmware. Javier -- Javier Cardona cozybit Inc. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: WDS problems observed in today's testing
On Mon, 2008-03-03 at 10:22 -0800, Javier Cardona wrote: Jim, On 3/3/08, Jim Gettys [EMAIL PROTECTED] wrote: These were WRT54GL's running OpenWRT, just to ask the exact configuration? Not sure if it was a WRT54G or WRT54GL, but I'm certain that it was running the original Linksys firmware. Yup. They will always have the problem. My point was that if you see a WRT54G (as opposed to the WRT54GL), you have to dig deeper to figure out if they can run OpenWRT or not. Some can; some cannot Nothing like changing hardware in a significant way without changing the model number. This has details: http://wiki.openwrt.org/OpenWrtDocs/Hardware/Linksys/WRT54G?highlight=(OpenWrtDocs/Hardware) - Jim -- Jim Gettys One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
RE: WDS problems observed in today's testing
We encountered this problem elsewhere and found out that the latest version of the firmware from Linksys (only works on the WRT54G v8 routers btw; might also work for the WAP54G as well) resolves the WDS problem. http://www.linksys.com/servlet/Satellite?blobcol=urldatablobheadername1 =Content-Typeblobheadername2=Content-Dispositionblobheadervalue1=text% 2Fplainblobheadervalue2=inline%3B+filename%3DWRT54G-v8_v8.00.5_fwReleas eNotes.txtblobkey=idblobtable=MungoBlobsblobwhere=1193773201628ssbin ary=truelid=8663037401B159 (Please paste the above link on your browser; clicking on the above link somehow didn't work for me). In the firmware version 8.00.5, it specifically mentions: Resolves issue with using a WAP54G in repeater mode. This looks to be a fairly recent version of the firmware. Regards, Ronak -Original Message- From: [EMAIL PROTECTED] [mailto:devel- [EMAIL PROTECTED] On Behalf Of Jim Gettys Sent: Monday, March 03, 2008 10:38 AM To: [EMAIL PROTECTED] Cc: OLPC Developer's List Subject: Re: WDS problems observed in today's testing On Mon, 2008-03-03 at 10:22 -0800, Javier Cardona wrote: Jim, On 3/3/08, Jim Gettys [EMAIL PROTECTED] wrote: These were WRT54GL's running OpenWRT, just to ask the exact configuration? Not sure if it was a WRT54G or WRT54GL, but I'm certain that it was running the original Linksys firmware. Yup. They will always have the problem. My point was that if you see a WRT54G (as opposed to the WRT54GL), you have to dig deeper to figure out if they can run OpenWRT or not. Some can; some cannot Nothing like changing hardware in a significant way without changing the model number. This has details: http://wiki.openwrt.org/OpenWrtDocs/Hardware/Linksys/WRT54G?highlight=(O pe nWrtDocs/Hardware) - Jim -- Jim Gettys One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Testing 200 XO's in two weeks time for Nepal's pilot
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 John Gilmore wrote: | I recommend that once you have developer keys, you leave the machines | unlocked. You are going to be running a lot of unsigned builds in the | future -- you're customizing your builds. Eventually, there must be a way for countries (and even trials) to get signed custom builds. Either they get their own signing keys, or OLPC offers to sign a nepal.1 branch of tweaked releases. I understand why this infrastructure has not yet been built, but it will be needed in order for Bitfrost to be used at all. - --Ben -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHzGK8UJT6e6HFtqQRAgrlAJ9t3RWJ0Iy41UB1HG9/QdcgTFfzYACglaxN oyGyaZ/pTCRANRT7ARB4eVc= =wuVO -END PGP SIGNATURE- ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [OLPC Networking] Issues with the wireless mesh devices
[EMAIL PROTECTED] wrote: Kim wrote: ...The network admin guys are quiet concerned about the DDOS possibilities. I comment, Hi Kim, I am very intested in the networking issue... because I am mounting a small lab to emulate the enviroment of the XOs Acces Point wireless work... About DDOS: At the end of this message the definition of a DDOS (distributed Denial of Service Attack... for those that need to know) Given that a pair of XOs shut down the local access point and the AP on the other end of the backbone link connected to the local AP there was more than enough justification to do extra digging. If some one was malicious enough to find a number of backbone nodes on the WAN then you see the problem here. Internet connected or not, the DoS problems remain. Your or my definition of DDos is not relevant in the big scheme of things, until the problem is better understood. regards, Kim ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Today's mesh testing.
On Sun, Mar 2, 2008 at 7:05 PM, Chris Ball [EMAIL PROTECTED] wrote: broadcast, and they were all able to see and join a shared chat session with each other. The workload on the spectrum analyzer increased from 18% (no-one connected) to 26% (all connected). The chat session is consistent -- no-one is dropping out and new messages are seen by each laptop, with a few seconds of lag. I would interpret this as, packets are being dropped like crazy, but retransmits assure that the chat message gets through by the time a few seconds elapse. Is there any reason why chat would not be instantaneous otherwise? With the mass chat session still running, we shared a 500KiB PDF. First we joined the shared Read session with one laptop, and the download took 16 seconds to complete. We then joined two more laptops at once, the first download took 26 seconds and the second finished at 30 seconds. Five more at once: all finished around 1m00s. Ten more at once: the first finished at 2m18s, the last finished at 2m40s. There were no failures downloading the PDF. The sharing was unicast TCP, with mesh TTL set to 1, which explains the slightly worse than linear increase in download time for more laptops downloading at once. How did you get sharing to use unicast? Was this a special patch, or is this actually the default? (My understanding is that sharing is multicast.) Just for reference, a 500kB file transmits over the media lab 802.11 network here in 1cc in just under 4 tenths of a second. I tested and it easily scaled up to 10 simultaneous downloads in 4-5 seconds. So somehow we're running 40-65 times slower than this on the mesh, depending on the number of clients. This is much more anecdotal than the full test plan, but we thought the testers currently in Peru would want to know what they can expect from the school server setup ASAP. We don't have more laptops upgraded and ready to join the network yet, but we don't have any reason to believe we've saturated the network -- with the PDFs downloaded and Chat still running, the duty cycle on the spectrum analyzer is now at 28%. (In general, wireless networks seem to start degrading around 40%.) Based on my reading of the numbers above, it does seem like you're pushing the network pretty hard. But, as wad pointed out, if we can do 32 clients on one channel of a school server, we can support the 100-laptop school scenario with three active antennas. --scott -- ( http://cscott.net/ ) ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [OLPC Networking] Issues with the wireless mesh devices
Some ideas: a) Google and other intense information providers have set up their servers to refuse too many requests from the same user in a short period of time. b) filtering (nat or caching software) will be a tool to do the same not only with http but with all the TCP/IP protocols. c) If a pair of XOs turn down an AP... it is an internal DOS. But, in my humble opinion, I wont call it a DOS because there is no intentional attack to the server. Regards, Javier Kim Hawtin wrote: [EMAIL PROTECTED] wrote: Kim wrote: ...The network admin guys are quiet concerned about the DDOS possibilities. I comment, Hi Kim, I am very intested in the networking issue... because I am mounting a small lab to emulate the enviroment of the XOs Acces Point wireless work... About DDOS: At the end of this message the definition of a DDOS (distributed Denial of Service Attack... for those that need to know) Given that a pair of XOs shut down the local access point and the AP on the other end of the backbone link connected to the local AP there was more than enough justification to do extra digging. If some one was malicious enough to find a number of backbone nodes on the WAN then you see the problem here. Internet connected or not, the DoS problems remain. Your or my definition of DDos is not relevant in the big scheme of things, until the problem is better understood. regards, Kim ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Testing 200 XO's in two weeks time for Nepal's pilot
Bryan Berry wrote: Here is the Rough Test Plan I have in mind 1. Boot into firmware and run test-all Note that the current shipping firmware can sometimes report false positives for sticky keys in the keyboard test. So if you think you have sticky keys upgrade the firmware to Q2D13 and also duplicate the test under Linux to verify you really have a sticky key. I appreciate any other ideas on testing the XO's, particularly testing the batteries and the network. All the battery failures I've seen can be detected with a full charge/discharge cycle. Unplug the laptop from ext power and let it run down until you get a red led or it shuts off then plug up to ext power and recharge. Re-charge should take at least 1.5 hours. Then unplug again. Build 656 should run in idle for 3 to 3.5 hours. If you get a green LED in less than 1.5h or the XO shuts off pre-maturely, or if the Red light flashes, then RMA that unit. If you get an early shutoff you might repeat the test. At least one report of a battery getting better after a few cycles. Not sure if this was just user error or really valid. If the battery-won't-charge problem is there then the charge time drops to 10's of minutes so its a quick re-test. Right now I'm only interested in units that have _flashing_ red led. So if you get a flashing LED contact me please. I have plenty of data for the other problem. But if you are curious or think you are getting confusing results you can run olpc-logbat and watch the numbers or send them to me and we can analyze any issues. -- Richard Smith [EMAIL PROTECTED] One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Testing 200 XO's in two weeks time for Nepal's pilot
On Sun, Mar 2, 2008 at 11:38 PM, Bryan Berry [EMAIL PROTECTED] wrote: Hey guys, Nepal should receive its shipment of 200 XO's in roughly 14 days from today. Here is the Rough Test Plan I have in mind 1. Boot into firmware and run test-all 2. Load customized image based on 656 build 3. Test localization on each XO (read Nepali, type in Nepali) You're talking about testing the keyboard layout and fonts. What about localization of software? According to Pootle, except possibly for XO-Bundled (89%), the Nepali localization is not in good shape. The rest of the modules are less than half translated, and Etoys less than 1%. Sayamindu, how many people do we have working on this? What organizations are involved? Why aren't there more? 4. Test that basic activities like browse, E-Paati, EToys work 5. Associate XO's w/ school server via active antenna, test basic school services, cache, moodle, file downloads, chat ... We will have two pilot schools. One w/ 110 students and the other w/ 50 students. And 40 spares? Any idea what you want to do with them? Notes: These XO's may have been tested thoroughly at the factory but I would prefer to at least run the firmware's test-all command after the XO's arrive in Nepal. I have been a sysadmin for about 10 years and I have always run some kind of diagnostics on new hardware before I put it into production. Quite right. Thanks in advance for everyone's help. -- Bryan W. Berry Systems Engineer OLE Nepal, http://www.olenepal.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Edward Cherlin End Poverty at a Profit by teaching children business http://www.EarthTreasury.org/ The best way to predict the future is to invent it.--Alan Kay ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Testing 200 XO's in two weeks time for Nepal's pilot
We need to do a lot of work on the localization, a lot. There hopefully will be a renewed effort on this from our team starting next week. There aren't 40 spare XO's. A chunk of those will go to the teachers (10-15) leaving some for spares and we may have a special class for kids not in the lucky grades 2 6 can learn how to use the XO. Bryan OLE Nepal http://www.olenepal.org On Mon, 2008-03-03 at 18:49 -0800, Edward Cherlin wrote: On Sun, Mar 2, 2008 at 11:38 PM, Bryan Berry [EMAIL PROTECTED] wrote: Hey guys, Nepal should receive its shipment of 200 XO's in roughly 14 days from today. Here is the Rough Test Plan I have in mind 1. Boot into firmware and run test-all 2. Load customized image based on 656 build 3. Test localization on each XO (read Nepali, type in Nepali) You're talking about testing the keyboard layout and fonts. What about localization of software? According to Pootle, except possibly for XO-Bundled (89%), the Nepali localization is not in good shape. The rest of the modules are less than half translated, and Etoys less than 1%. Sayamindu, how many people do we have working on this? What organizations are involved? Why aren't there more? 4. Test that basic activities like browse, E-Paati, EToys work 5. Associate XO's w/ school server via active antenna, test basic school services, cache, moodle, file downloads, chat ... We will have two pilot schools. One w/ 110 students and the other w/ 50 students. And 40 spares? Any idea what you want to do with them? Notes: These XO's may have been tested thoroughly at the factory but I would prefer to at least run the firmware's test-all command after the XO's arrive in Nepal. I have been a sysadmin for about 10 years and I have always run some kind of diagnostics on new hardware before I put it into production. Quite right. Thanks in advance for everyone's help. -- Bryan W. Berry Systems Engineer OLE Nepal, http://www.olenepal.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [OLPC Networking] Issues with the wireless mesh devices
[EMAIL PROTECTED] wrote: Some ideas: a) Google and other intense information providers have set up their servers to refuse too many requests from the same user in a short period of time. b) filtering (nat or caching software) will be a tool to do the same not only with http but with all the TCP/IP protocols. c) If a pair of XOs turn down an AP... it is an internal DOS. But, in my humble opinion, I wont call it a DOS because there is no intentional attack to the server. perhaps you miss-read my earlier post. the atheros radios stops working and need to be reset by a kernel module reload on most occasions or power cycle. i expect that IP filtering would not help. i've not been able to predictably repeat it yet. below is the info from the network admins as to what was running on the AP[1] running FreeBSD[2]. we have also had the same problem on some cisco APs using atheros with virtual ESSID support at work. more info as i find it. regards, kim -- [1] system: WRAP2 geode 266mhz AP interface: Senao 8602 PLUS (FCC) 400mw abg Backbone interface: Senao 8602 (ETSI) LFP 100mw abg [2] kern.version: FreeBSD 6.2-RELEASE-p5 #1: Tue Jul 24 20:41:51 CST 2007 hw.ath.hal.version: 0.9.17.2 ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: WDS problems observed in today's testing
Yup. They will always have the problem. My point was that if you see a WRT54G (as opposed to the WRT54GL), you have to dig deeper to figure out if they can run OpenWRT or not. Some can; some cannot A simple rule of thumb. Recent units can't. Nothing like changing hardware in a significant way without changing the model number. Be thankful that they made the L version for hackers like us. -- These are my opinions, not necessarily my employer's. I hate spam. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Need Help
Hello All, I am having a problem and unable to find any solution regarding that, I have written an activity in using GTK and glade, and have sugarized it according to the hello world tutorial in wiki. but still i dont know what is going on as the icon of the activity stays in the ring and then disappears after some time, i have rechecked my code again and again and cant find any thing that is of Coding error can anybody please see the log i am attaching and tell me is rainbow stoping it ?? regards -- Waqas Toor org.laptop.sugar.QiratActivity-2.log Description: Binary data ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Testing 200 XO's in two weeks time for Nepal's pilot
On 3/4/08, Edward Cherlin [EMAIL PROTECTED] wrote: .snipped You're talking about testing the keyboard layout and fonts. What about localization of software? According to Pootle, except possibly for XO-Bundled (89%), the Nepali localization is not in good shape. The rest of the modules are less than half translated, and Etoys less than 1%. Sayamindu, how many people do we have working on this? What organizations are involved? Why aren't there more? As per user account stats in Pootle, we have five people signed up for Nepali translations. Thanks, Sayamindu -- Sayamindu Dasgupta [http://sayamindu.randomink.org/ramblings] ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Need Help
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Waqas Toor wrote: | Hello All, | | I am having a problem and unable to find any solution regarding that, | I have written an activity in using GTK and glade, and have sugarized | it according to the hello world tutorial in wiki. but still i dont | know what is going on as the icon of the activity stays in the ring | and then disappears after some time, i have rechecked my code again | and again and cant find any thing that is of Coding error | | | can anybody please see the log i am attaching and tell me is rainbow | stoping it ?? You appear to have discovered a bug in Rainbow, which is dying with an assertion failure. Until Rainbow is fixed, you should do as Walter suggested and disable Rainbow. - --Ben -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHzOQBUJT6e6HFtqQRAp/UAJ43nJwJBbCSbZdBEOnPU9KAG7UAuQCfasdz J571RBiFo6T5quGBz4BSAW8= =2hyy -END PGP SIGNATURE- ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
uucp for sneakernet (was Re: Emulating the School...]
2008-03-03T05:50:31 [EMAIL PROTECTED]: We are studying the Wizzy and all the UUCP related issues. Don't know what Wizzy is, but _very_ glad to hear uucp is being looked at for sneakernet[1]. It's been 10 years since I used uucp, and that was for a truly baroque firewall; 20 years since I've wielded uucp in anger; but it's the first place I'd turn for sneaker-netting posix-ish systems together. Usenet was born on uucp, and a _bunch_ of us olde beezers enjoyed hours-latency email via polling dialup uucp via modems before we got internet connectivity. In its dying days I remember doing uucp between MS-DOS and unix over dialup with free software, so there's a lot of possibly helpful dried-out bits we can probably dredge out of the storage bins for re-assembling today. If this (uucp exploration) goes anywhere, do please Cc me (or [EMAIL PROTECTED] of course). -Bennett [1] sneakernet == delivering network transport over offline media carried between disconnected computers pgpMMy2KU4oYj.pgp Description: PGP signature ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Testing 200 XO's in two weeks time for Nepal's pilot
On Mon, Mar 3, 2008 at 10:41 PM, Sayamindu Dasgupta [EMAIL PROTECTED] wrote: On 3/4/08, Edward Cherlin [EMAIL PROTECTED] wrote: .snipped You're talking about testing the keyboard layout and fonts. What about localization of software? According to Pootle, except possibly for XO-Bundled (89%), the Nepali localization is not in good shape. The rest of the modules are less than half translated, and Etoys less than 1%. Sayamindu, how many people do we have working on this? As per user account stats in Pootle, we have five people signed up for Nepali translations. Is there a way for me to find out these things, or do I have to ask you each time? Is there a way for me to communicate with these five other than a blast to the whole localization mailing list? I asked two other questions: What organizations are involved? Why aren't there more? Please take a look at the Recruiting Localizers section of the Localization Wiki page. I want to see the same information for Nepali. Do I need to do it myself, as I did for Khmer, or can I get some help? Actually, I want to see the same kind of information for the 60 or so languages in Pootle, and quite a few more. Is anybody willing? Having some of you for each language and country spend a little of your time on gathering information and recruiting others to the cause will get us through much faster than keeping all your heads down and doing the work with the few people we have now. Thanks, Sayamindu -- Sayamindu Dasgupta [http://sayamindu.randomink.org/ramblings] -- Edward Cherlin End Poverty at a Profit by teaching children business http://www.EarthTreasury.org/ The best way to predict the future is to invent it.--Alan Kay ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
squid problem
Hey Adrian, I have a small problem with squid offline mode. I was hoping that you would point me to right direction. 1. I can not access pages in offline_mode. Here is what i did: on squid.conf i added cachemgr_passwd none offline_toggle then squidclient mgr:offline_toggle---it said this HTTP/1.0 200 OK Server: squid/2.6.STABLE16 Date: Tue, 04 Mar 2008 06:53:39 GMT Content-Type: text/plain Expires: Tue, 04 Mar 2008 06:53:39 GMT Last-Modified: Tue, 04 Mar 2008 06:53:39 GMT X-Cache: MISS from sugaroffice.ole X-Cache-Lookup: MISS from sugaroffice.ole:3128 Via: 1.0 sugaroffice.ole:3128 (squid/2.6.STABLE16) Proxy-Connection: close offline_mode is now ON I closed my internet connection, and tried to access a page that i was viewing earlier but no result So, what am i missing? Is it something to do with routing? or cache-lookup not being available. Thanks in advance. best, Sulochan. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
