Re: Very strange: Cannot access any sites although connection apparently good

[David Clymer <david@zettazebra.com>]

On Mon, 2004-02-16 at 08:55, Anthony Campbell wrote:
> I have a very strange problem.
> 
> 1. If I connect via my ADSL modem everything works perfectly.
> 
> 2. If I connect via my Netgear MR814 rounter and the modem everything also
> appears to work (dig, ping are OK) but no web sites are accessible. The
> names are resolved but at the last stage the browser (any browser) fails
> to connect.
> 
> 3. It is not a hardware problem because on Knoppix there are no problems
> and a second computer connected to the router also works perfectly.
> 
> There must therefore be something wrong or corrupt on my desktop but I
> have no idea how to find it.
> 
> Any suggestions where to look?

Do you have ECN enabled?

$ cat /proc/sys/net/ipv4/tcp_ecn

(1 == on, 0 == off)

If so, its possible that your netgear router does not handle ECN packets
properly.

try: 

$ echo 0 > /proc/sys/net/ipv4/tcp_ecn

and see if that makes any difference.

-davidc