Re: 14.4kbps PPP link?
* Brian May [EMAIL PROTECTED] writes: Sometimes pinging the remote host seems to provoke the data transfer to start again (or is this coincidence?) I have seen this as well, with the 14.4k of my parents (Doze´95). At my parents, I had multiple Netscape connections open, and all of them would stall. Then, Stopping transfer and reloading it would make all connections react again. I have not pinged or anything, but maybe any new request tells the remote host you are alive. It seems that the remote host thinks that since you are accept things so slowly, it just pauses for a while. I seem to remember I was using different locations back then with the 14.4k, and all of them became respondent again after a reload request on *one* location. So it could have been a host on the route that was shared by my connections that was stalling transfer, i.e. one close to me, *if* I remember correctly. [...] Good point. However, I am worried I would have the same problems with a faster modem, too. With 56k all goes well for me. But then, it´s Debian this time. If it doesn´t go well, I´m usually thinking that my provider´s machines just have short-term problems. Colin -- | Re: Kernel size is 666K! I kid you not! | by Anonymous Coward on Tuesday January 26, @08:50AM | I came home from a Barry Manilow concert once and had 666 burned into | my forehead! I shit you not![Kernel 2.2.0 is announced on /.]
Re: 14.4kbps PPP link?
On Mon, Nov 15, 1999 at 11:28:11PM -0800, aphro wrote: On Tue, 16 Nov 1999, Brian May wrote: bam Anyone got any suggestions how to fix this problem? I have tcpdumped my bam side of the connection, and the problem seems to be my computer waiting bam ages for remote data. bam bam This problem is driving me up the wall - as I have 14.4kbps, I feel bam that I should be able to get close to 14.4kbps... bam next time it happens run a traceroute ..if it is timing out while in route to the site..then the isp/routers are havin trouble if you get time outs at hop 1 chances are your connection is screwed. id also suggest an Thank you for the suggestion - during a break while nothing was being transmitted, I tried to ping to the source computer. I don't understand the results. When data is not being transmitted (but should be), ping reports small RTT values (ie no congestion), but when data is being transmitted, I get high RTT values (as expected). traceroute reports similar results. However, something has to be going wrong somewhere, otherwise my modem would be receiving data at 14.4kbs continuously until the file is transferred (or aborted). Sometimes pinging the remote host seems to provoke the data transfer to start again (or is this coincidence?) Also, I don't recall ever mentioning the word timeout in my previous post. (I think another poster was confused). While, yes, this problem is reponsible for aborting transfers due to time out errors (especially with apt-get), I want to make it clear that is *not* the problem I am talking about here. The problem I have is when transferring a file over a uncongested PPP link, the modem receive light stays off for extended periods of time, wasting time which could be used transferring the current file. Sometimes this lasts several minutes. This is my modem setup: ATV ACTIVE PROFILE: B0 E1 L2 M1 N1 Q0 T V1 W2 X4 Y0 C1 D2 G0 J0 K3 Q5 R1 S1 T4 X0 Y0 S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:004 S07:030 S08:004 S09:006 S10:018 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:000 S44:000 S46:138 S48:007 S95:000 Anything look wrong here? Anything dumb, like XON/XOFF flow control enabled when it shouldn't be? I can't find a manually right now to tell my what these codes mean :-( upgrade to a faster modem :) a good 56k pci/isa modem can be had for about $35 ..even if your lines dont support 56k you can at least do 28.8/33.6 ..you might try different INIT strings too ..the one i use for my 56k modem is about 50 characters long :/ i programmed it into the ROM now tho so when i hit ATZ it uses that string. Good point. However, I am worried I would have the same problems with a faster modem, too. -- Brian May [EMAIL PROTECTED]
Re: 14.4kbps PPP link?
On Wed, 17 Nov 1999, Brian May wrote: bam Sometimes pinging the remote host seems to provoke the data transfer bam to start again (or is this coincidence?) so, it seems its more of a modem connection problem then a network protocol/performance problem..Do you have a shell or ftp access to a machine on your isp's network? its a good test to try to d/l something off the isp's network..i bet the admins there would be willing to throw something up on anonymous ftp for you to get for testing. bam ATV bam ACTIVE PROFILE: bam B0 E1 L2 M1 N1 Q0 T V1 W2 X4 Y0 C1 D2 G0 J0 K3 Q5 R1 S1 T4 X0 Y0 bam S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:004 S07:030 S08:004 S09:006 bam S10:018 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:000 S44:000 bam S46:138 S48:007 S95:000 bam bam Anything look wrong here? Anything dumb, like XON/XOFF flow control bam enabled when it shouldn't be? I can't find a manually right now to tell bam my what these codes mean :-( to be honest i dont know :/ its been S LONG since i used a 14.4k (~1994) this is the init string i use for my k56flex/v90 modem(i know it wont help you int his case but others may want, i found it makes for a VERY stable and fast connection) AT +MS=12,1,4,56000 E0 V1 D2 C1 W1 S0=0 S95=47 S202=32 (S202 is an undocumented feature) as for the AT commands, i got a PDF file here you can download and read.. http://www.firetrail.com/~aphro/atmodem.pdf it explains everything rpretty much. the admin at my local isp here helped me out a lot in getting a good string goin, im lucky to have such a good admin down here :) i forgot most of my modem stuff when i quot BBS'n back in '95. bam Good point. However, I am worried I would have the same problems with a bam faster modem, too. that is possible ..i can personally report very good results with USR and Zoomtel and GVC modems under linux. sorry i cant help much more : nate [mailto:[EMAIL PROTECTED] ]-- Vice President Network Operations http://www.firetrail.com/ Firetrail Internet Services Limited http://www.aphroland.org/ Everett, WA 425-348-7336http://www.linuxpowered.net/ Powered By:http://comedy.aphroland.org/ Debian 2.1 Linux 2.0.36 SMPhttp://yahoo.aphroland.org/ -[mailto:[EMAIL PROTECTED] ]-- 9:49pm up 89 days, 9:23, 2 users, load average: 1.44, 1.53, 1.57
Re: 14.4kbps PPP link?
On Tue, Nov 16, 1999 at 10:20:17PM -0800, aphro wrote: so, it seems its more of a modem connection problem then a network protocol/performance problem..Do you have a shell or ftp access to a Nothing seems to make much sense (too me). *If* it was a modem problem, then I would expect ping to return high RTT values. Perhaps the problem is because of transmission errors: ifconfig reports RX packets:5931 errors:295 dropped:0 overruns:0 frame:295 This is rather large number of errors, assuming the count reset when I reset the PPP connection several hours ago. Perhaps a new set of modems would help ;-) Still, I thought PPP was meant to be able to handle errors internally? I think the statistics above mention the number of packet errors that need to be fixed by TCP retransmitting it, but please correct me if I am wrong. Does tcpdump show currupted packets? machine on your isp's network? its a good test to try to d/l something off the isp's network..i bet the admins there would be willing to throw something up on anonymous ftp for you to get for testing. Thats what I was doing (apana.org.au isn't a ISP in the usual sense, is based on work provided by volunteers, and has mirrors of Debian). bam ATV bam ACTIVE PROFILE: bam B0 E1 L2 M1 N1 Q0 T V1 W2 X4 Y0 C1 D2 G0 J0 K3 Q5 R1 S1 T4 X0 Y0 bam S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:004 S07:030 S08:004 S09:006 bam S10:018 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:000 S44:000 bam S46:138 S48:007 S95:000 bam bam Anything look wrong here? Anything dumb, like XON/XOFF flow control bam enabled when it shouldn't be? I can't find a manually right now to tell bam my what these codes mean :-( to be honest i dont know :/ its been S LONG since i used a 14.4k (~1994) this is the init string i use for my k56flex/v90 modem(i know it wont help you int his case but others may want, i found it makes for a VERY stable and fast connection) AT +MS=12,1,4,56000 E0 V1 D2 C1 W1 S0=0 S95=47 S202=32 Main differences to my setup seem to be +MS=... - SELECT MODULATION E0 - disable command echo W1 - CONNECT MESSAGE CONTROL S95=47 - EXTENDED RESULT CODES as for the AT commands, i got a PDF file here you can download and read.. http://www.firetrail.com/~aphro/atmodem.pdf it explains everything rpretty much. the admin at my local isp here helped me out a lot in getting a good string goin, im lucky to have such a good admin down here :) i forgot most of my modem stuff when i quot BBS'n back in '95. Thanks for the URL - will try that latter. Have found some documentation on a supplied disk for now, seems OK, but were some errors on the disk :-(. -- Brian May [EMAIL PROTECTED]
Re: 14.4kbps PPP link?
On Tue, Nov 16, 1999 at 01:15:04PM -0800, aphro wrote: On Tue, 16 Nov 1999, Brad wrote: lists Make sure to check the Linux Modem Compatibility Knowledge Base before you lists buy, so you don't end up with a modem that won't work with Linux. lists http://www.o2.net/~gromitkc/winmodem.html i have yet to find a standard modem that does not work with linux. as long as its a normal modem .. and preferrably able to hard code it to a com port ..it should work..ive used about 10 different modems in linux never had a prob.. Then you likely know enough to avoid buying a winmodem. Some people don't even realize there is a difference, and instead of letting them risk wasting time and money trying to get a winmodem working i point them to that website. IIRC there're only a small number (5?) of PCI modems that are not winmodems. This number is increasing, but not excessivly rapidly. -- finger for GPG public key. 16 Nov 1999 - new key generated, please stop using the old. pgpMHHGnXwKom.pgp Description: PGP signature
Re: 14.4kbps PPP link?
On Wed, 17 Nov 1999, Brian May wrote: bam Still, I thought PPP was meant to be able to handle errors internally? bam I think the statistics above mention the number of packet errors bam that need to be fixed by TCP retransmitting it, but please correct bam me if I am wrong. those are packet errors, the modem connection protocol V42BIS (?) will attempt internal error correction when possible..i dont know of any way to view those stats. when i used NT(before i saw the light) a few years back the DUN there had modem stats: CRC, Timeout, Alignment, Framing, Hardware overruns, buffer overruns. bam Thats what I was doing (apana.org.au isn't a ISP in the usual sense, is bam based on work provided by volunteers, and has mirrors of Debian). ok bam Thanks for the URL - will try that latter. Have found some documentation bam on a supplied disk for now, seems OK, but were some errors on the disk bam :-(. doh! ok nate [mailto:[EMAIL PROTECTED] ]-- Vice President Network Operations http://www.firetrail.com/ Firetrail Internet Services Limited http://www.aphroland.org/ Everett, WA 425-348-7336http://www.linuxpowered.net/ Powered By:http://comedy.aphroland.org/ Debian 2.1 Linux 2.0.36 SMPhttp://yahoo.aphroland.org/ -[mailto:[EMAIL PROTECTED] ]-- 7:01am up 89 days, 18:35, 1 user, load average: 1.92, 1.87, 1.80
Re: 14.4kbps PPP link?
On Wed, 17 Nov 1999 [EMAIL PROTECTED] wrote: lists Then you likely know enough to avoid buying a winmodem. Some people lists don't even realize there is a difference, and instead of letting them lists risk wasting time and money trying to get a winmodem working i point lists them to that website. yeah, i cant stand winmodems even under windows, their concept was nice back when the average 56k modem was over $100 ..but with real modems dropping to less then $40 (in some cases less then $30 for real shit real modem) its just not worth it.. lists IIRC there're only a small number (5?) of PCI modems that are not lists winmodems. This number is increasing, but not excessivly rapidly. yeah, i stick to Diamond's line of modems for the past year or so(for both linux and win*). nate [mailto:[EMAIL PROTECTED] ]-- Vice President Network Operations http://www.firetrail.com/ Firetrail Internet Services Limited http://www.aphroland.org/ Everett, WA 425-348-7336http://www.linuxpowered.net/ Powered By:http://comedy.aphroland.org/ Debian 2.1 Linux 2.0.36 SMPhttp://yahoo.aphroland.org/ -[mailto:[EMAIL PROTECTED] ]-- 7:01am up 89 days, 18:35, 1 user, load average: 1.92, 1.87, 1.80
Re: 14.4kbps PPP link?
On Tue, 16 Nov 1999, Brian May wrote: bam Anyone got any suggestions how to fix this problem? I have tcpdumped my bam side of the connection, and the problem seems to be my computer waiting bam ages for remote data. bam bam This problem is driving me up the wall - as I have 14.4kbps, I feel bam that I should be able to get close to 14.4kbps... bam next time it happens run a traceroute ..if it is timing out while in route to the site..then the isp/routers are havin trouble if you get time outs at hop 1 chances are your connection is screwed. id also suggest an upgrade to a faster modem :) a good 56k pci/isa modem can be had for about $35 ..even if your lines dont support 56k you can at least do 28.8/33.6 ..you might try different INIT strings too ..the one i use for my 56k modem is about 50 characters long :/ i programmed it into the ROM now tho so when i hit ATZ it uses that string. nate [mailto:[EMAIL PROTECTED] ]-- Vice President Network Operations http://www.firetrail.com/ Firetrail Internet Services Limited http://www.aphroland.org/ Everett, WA 425-348-7336http://www.linuxpowered.net/ Powered By:http://comedy.aphroland.org/ Debian 2.1 Linux 2.0.36 SMPhttp://yahoo.aphroland.org/ -[mailto:[EMAIL PROTECTED] ]-- 11:23pm up 88 days, 10:56, 1 user, load average: 1.68, 1.60, 1.72
Re: 14.4kbps PPP link?
On Mon, 15 Nov 1999, aphro wrote: ..you might try different INIT strings too ..the one i use for my 56k modem is about 50 characters long :/ i programmed it into the ROM now tho so when i hit ATZ it uses that string. could you share some info on init strings with me? I'm trying to do simple things but w/o success. For example, I'd like to set the ring to be silent as well as the modems conversation. Where should I put such commands? I guess the commands are M0L0 but I'm not sure. Any hints/suggestion/URL/HOWTO/etc is welcome. Thanks, Mario O.de MenezesMany are the plans in a man's heart, but IPEN-CNEN/SP is the Lord's purpose that prevails http://curiango.ipen.br/~mario Prov. 19.21 http://www.revistalinux.com.br
Re: 14.4kbps PPP link?
-BEGIN PGP SIGNED MESSAGE- On Mon, 15 Nov 1999, aphro wrote: id also suggest an upgrade to a faster modem :) a good 56k pci/isa modem can be had for about $35 ..even if your lines dont support 56k you can at least do 28.8/33.6 Make sure to check the Linux Modem Compatibility Knowledge Base before you buy, so you don't end up with a modem that won't work with Linux. http://www.o2.net/~gromitkc/winmodem.html - -- finger for PGP public key. -BEGIN PGP SIGNATURE- Version: 2.6.3ia Charset: noconv iQCVAwUBODGzVr7M/9WKZLW5AQHelAP+LwI9mVV7sUCG044IOjALXqUnQzDg4N2v GnTa8ik9k3QsY/hlf9077A+jQDtnuyhrTazhF2t4nuzUCPGnIeui6XHUJF4WIVMI EIevS9LcCAthnzODMg3BMHFe0g4W03qZBm5zMu6YkAurJO+ssRlqAy8chNzHkmmq BUtRjYoLE1I= =RhSa -END PGP SIGNATURE-
Re: 14.4kbps PPP link?
On Tue, Nov 16, 1999 at 06:12:36PM +1100, Brian May wrote On Mon, Nov 15, 1999 at 05:12:41AM +, John Hasler wrote: apt-get dist-upgrade Over a 28.8 dialup? ROTFL. I do it over 14.4 kbs... (sorry I couldn't resist). Of course, it would be nice if transfer rates would maintain 14.4kbs, but something seems to be wrong with my PPP (or ISPs) setup. The modem is often idle with nothing being transferred - so the transfer rate (according to apt-get drops to below 300 bytes/second). Anyone got any suggestions how to fix this problem? I have tcpdumped my side of the connection, and the problem seems to be my computer waiting ages for remote data. This problem is driving me up the wall - as I have 14.4kbps, I feel that I should be able to get close to 14.4kbps... It sounds like you may want to adjust the Timeout setting for the protocol you're using (http or ftp) in /etc/apt.conf; from looking at /usr/doc/apt/examples/apt.conf.gz I assume that the default tiemout is 120 seconds, which seems reasonable, but if you're losing a lot of packets it may help to reduce it; but if you reduce it too far, you'll lose out by abandoning connections that are just slow. If you're connecting via a proxy, you probably want to see if you can fix it there first. John P. -- [EMAIL PROTECTED] [EMAIL PROTECTED] Oh - I - you know - my job is to fear everything. - Bill Gates in Denmark
Re: 14.4kbps PPP link?
On Tue, 16 Nov 1999, Brad wrote: lists Make sure to check the Linux Modem Compatibility Knowledge Base before you lists buy, so you don't end up with a modem that won't work with Linux. lists http://www.o2.net/~gromitkc/winmodem.html i have yet to find a standard modem that does not work with linux. as long as its a normal modem .. and preferrably able to hard code it to a com port ..it should work..ive used about 10 different modems in linux never had a prob.. nate [mailto:[EMAIL PROTECTED] ]-- Vice President Network Operations http://www.firetrail.com/ Firetrail Internet Services Limited http://www.aphroland.org/ Everett, WA 425-348-7336http://www.linuxpowered.net/ Powered By:http://comedy.aphroland.org/ Debian 2.1 Linux 2.0.36 SMPhttp://yahoo.aphroland.org/ -[mailto:[EMAIL PROTECTED] ]-- 1:12pm up 89 days, 45 min, 1 user, load average: 1.51, 1.70, 1.68
