Re: Very strange: Cannot access any sites although connection apparently good
On 16 Feb 2004, David Clymer wrote:
> 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
>
Yes, thank you very much; this really does seem to be it.
Next question: how do I turn it off permanently? A quick search on my
system suggests it has something to do with ipchains, hence my firewall,
which seems a bit of a problem.
Anthony
--
ac@acampbell.org.uk || http://www.acampbell.org.uk
using Linux GNU/Debian || for book reviews, electronic
Windows-free zone || books and skeptical articles
Reply to: