Re: [Server-devel] Technical questions

2010-01-27 Thread Eustace Amah
Am trying to reflash an XO but it quits after few lines with an error like this

Net 516.6s 98KiB/s
CRC mismatch for block #330: want 6ebdc7ac got 15f49d1b
OLPC C2,256 MiB memory installed,S/N SHC837006DD
OpenFirmware CL1 Q2E41 Q2E

Use poer button to power off.

I need your help.

Rgds
Eustace Amah
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Re: [Server-devel] Technical questions

2010-01-21 Thread Eustace Amah
One of the problem that am experiencing now is that I configured the 15 APs 
with same ESSID, different channels(1,6,11) shared among them and located all 
around the school. Remember that the APs are configured with different subnet 
from the lease of DHCP server but when more than 3 XO tries to connect it 
knocks everyone out immediately. The APs are PoE enabled. The models are Cisco 
Small Business Model WAP4410N. I have increased the power to the APs.

Any solution to this?


-Original Message-
From: Martin Langhoff [mailto:martin.langh...@gmail.com] 
Sent: Thursday, January 21, 2010 1:09 PM
To: James Cameron; aklei...@sonic.net; Reuben K. Caron; taiwo.alabi; Eustace 
Amah; server-devel@lists.laptop.org; Emeka Lewis Nwankwo; kene.ijezie
Subject: Re: [Server-devel] Technical questions

On Thu, Jan 21, 2010 at 12:28 PM, Martin Langhoff
martin.langh...@gmail.com wrote:
 3 - Define how many users you can connect to an AP -- some APs have
 configured hard limits in the software they ship. If you have to
 guess, assume ~40 as the upper limit.

Let's reword that as: assume 30, which is where most APs start having
problems. If you are using OpenWRT, you can probably support 40. If
you have tested your AP, then you'll know for real.

In general, it is very hard to go over 40 active nodes per channel;
this is mainly due to limitations of sharing the commons of the
radio spectrum.

High end APs may be able to operate different antennas in different
channels -- so one AP acts as if it were 3, working on 1, 6 and 11.

cheers,



m
-- 
 martin.langh...@gmail.com
 mar...@laptop.org -- School Server Architect
 - ask interesting questions
 - don't get distracted with shiny stuff  - working code first
 - http://wiki.laptop.org/go/User:Martinlanghoff
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Re: [Server-devel] Technical questions

2010-01-20 Thread Eustace Amah
Hi Martin,
Thanks for the prompt reply. I need to know what to configure on t he eth1?The 
client XO needs to get their IP Lease from eth1 and connect to the internet 
while eth0 will serve as the outbound connections.
Also I have about 15 Access points installed in the school. Must I have them on 
channel 1,6 and 11 or can I leave them on Auto? Should I configure the Access 
points to lease their IP from the DHCP server or it should be fixed?


Rgds
Eustace Amah

From: martin.langhoff.o...@gmail.com [mailto:martin.langhoff.o...@gmail.com] On 
Behalf Of Martin Langhoff
Sent: Tuesday, January 19, 2010 9:40 PM
To: Reuben K. Caron
Cc: Eustace Amah; caron.reuben; Emeka Lewis Nwankwo; taiwo.alabi; kene.ijezie
Subject: Re: Technical questions

Hi Eustace,

I will try to answer your questions -- if you think you will need more help, 
please do post your questions to 
server-devel@lists.laptop.orgmailto:server-devel@lists.laptop.org -- I will 
set the list so that your messages come through, and we'll help you there.

First - the ISP info sounds reasonable, you will need to put those IP addresses 
 netmasks in the eth0 configuration -- see notes here 
http://wiki.laptop.org/go/XS_Techniques_and_Configuration#Setting_a_static_IP_address_for_eth0

If you want to use OpenDNS, you will have to _ignore_ the ISPs own DNS servers. 
They may prevent you from doing that - so my recommendation is: get things 
started using the ISPs DNS servers. Once it's all going (so you know you're 
configuring things right), try to switch to the OpenDNS servers -- if it 
doesn't work... well... it's probably that the ISP is blocking it.

In some cases, it makes sense for an ISP to block this traffic (there some 
malicious DNS servers out there). Consider asking them to make an exception for 
OpenDNS -- which is a well known non-malicious DNS service.

Under linux - and specifically because this is a server that in itself provides 
DNS services -- you have to set the DNS servers in a special config file. See 
the notes here 
http://wiki.laptop.org/go/XS_Techniques_and_Configuration#Use_OpenDNS

On Tue, Jan 19, 2010 at 9:04 PM, Reuben K. Caron 
reu...@laptop.orgmailto:reu...@laptop.org wrote:

I wish to use the following IPaddr as the server IPss for the two separate 
sites 204.14.46.10 and 204.14.46.14respectively.

I don't understand this part. Are those the IP addresses the ISP is telling you 
to use?


The Servers has two network interface card each eth0 and eth1. Eth0 will serve 
for the external communications while Eth1 will serve for the internal 
communication for the DHCP server.

The DHCP lease will be private IP address like 172.0.0.1 and so on. This will 
be loop of IPss released to the XO to either connect to each other or to the 
internet. So I guess that the netmodem IP will server as the Gateway address. 
Correct me if am wrong.

The XS is preconfigured to run the network in the 178.x segment. Let it do its 
thing as it is a very specific setup.

 Can you help me with the list of files that I need to edit and what are the 
steps.

Yes, you need to read the Installation guide, and then pick and choose what 
parts of the techniques and configuration page you want to use / apply.

http://wiki.laptop.org/go/XS_Installing_Software
http://wiki.laptop.org/go/XS_Techniques_and_Configuration

cheers,


m
--
mar...@laptop.orgmailto:mar...@laptop.org -- School Server Architect
- ask interesting questions
- don't get distracted with shiny stuff  - working code first
- http://wiki.laptop.org/go/User:Martinlanghoff
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