Re: Very strange: Cannot access any sites although connection apparently good
On Mon, 2004-02-16 at 12:17, Anthony Campbell wrote:
> 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.
>
You could recompile your kernel without ECN support or could have a
script run at boot time to turn it off in the same way that you just
did.
-davidc
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