Re: Strange problem accessing Virgin.net servers

From: Chris Gordon-Smith (use.address_at_my.homepage)
Date: 04/16/05 

Date: Sat, 16 Apr 2005 11:55:30 +0100

David Schwartz wrote:

>
> "Chris Gordon-Smith" <use.address@my.homepage> wrote in message
> news:3cand2F6lgdolU1@individual.net...
>> Can anyone suggest what might be causing this very strange problem.
>>
>> I have a SuSE 9.2 desktop PC that I connect to the Internet using an ADSL
>> modem / router. Currently my Internet access is all working fine, except
>> that I am not able to access the website www.virgin.net, and I am also
>> unable to access my Virgin pop account on their server pop.virgin.net.
>>
>> I am also unable to ping either of these addresses, although ping is able
>> to
>> resolve the corresponding TCP/IP addresses.
>>
>> My broadband connection is from another ISP (not Virgin). I have spoken
>> to Virgin's technical people. They say that all their servers are
>> currently working fine, and my brother in law also says that his Virgin
>> email account
>> is working fine.
>>
>> How is this possible? I can ping Google or the BBC website and access any
>> other site I can think of, except Virgin.
>>
>> Can anyone explain?
>
> Just as a guess, do you have ECN enabled? (Explicit Congestion
> Notification)
>
> DS

I don't think I have ECN enabled, and have in any case manually disabled it
with
echo "0" > /proc/sys/net/ipv4/tcp_ecn

as mentioned on SuSE's website

Here is what I get from tcpdump -p -i any port 80

when I try to access www.virgin.net with the lynx text web browser and
specify 'unset http_proxy' :-

listening on any, link-type LINUX_SLL (Linux cooked), capture size 96 bytes
11:49:31.067426 IP 192.168.0.3.ff-sm > www.virgin.net.http: S
2301224435:2301224435(0) win 5840 <mss 1460,sackOK,timestamp 2051857
0,nop,wscale 2>
11:49:34.066589 IP 192.168.0.3.ff-sm > www.virgin.net.http: S
2301224435:2301224435(0) win 5840 <mss 1460,sackOK,timestamp 2054857
0,nop,wscale 2>
11:49:40.065679 IP 192.168.0.3.ff-sm > www.virgin.net.http: S
2301224435:2301224435(0) win 5840 <mss 1460,sackOK,timestamp 2060857
0,nop,wscale 2>
11:49:52.063859 IP 192.168.0.3.ff-sm > www.virgin.net.http: S
2301224435:2301224435(0) win 5840 <mss 1460,sackOK,timestamp 2072857
0,nop,wscale 2>
11:50:16.060206 IP 192.168.0.3.ff-sm > www.virgin.net.http: S
2301224435:2301224435(0) win 5840 <mss 1460,sackOK,timestamp 2096857
0,nop,wscale 2>
11:51:04.052916 IP 192.168.0.3.ff-sm > www.virgin.net.http: S
2301224435:2301224435(0) win 5840 <mss 1460,sackOK,timestamp 2144857
0,nop,wscale 2>

My reading of this is that absolutely nothing is coming back. Any thoughts? 

-- 
Chris Gordon-Smith
London
http://graffiti.virgin.net/c.gordon-smith/

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