clue for the clueless please

Tue Jan 23 15:55:05 UTC 2001

Fixed - yep MTU on the E1 link was the problem.

Thanks Ryan, and all the other who tried in private e-mail.

rgds,
--
Peter Galbavy
Knowledge Matters Ltd.
http://www.knowledge.com/
----- Original Message -----
From: "Ryan O'Connell" <ryan at complicity.co.uk>
To: "Peter Galbavy" <peter.galbavy at knowledge.com>
Cc: <nanog at merit.edu>
Sent: Tuesday, January 23, 2001 3:36 PM
Subject: Re: clue for the clueless please

>
> On Tue, Jan 23, 2001 at 01:59:41PM -0000, Peter Galbavy wrote:
> > Yes, we intentionally (for some other reason during testing) set the MTU
on
> > the p2p link to 554 - oops. Will get it switched back... Still wondering
> > though - if a normal dial-up has a lower than 1500 MTU, why would they
work.
>
> Sounds almost certainly like an MTU problem. Try www.bt.com, if that fails
> then it's pretty much definite. Microsoft are a bit silly for setting the
> DF bit on outbound packets, firewalls at web hosting facilities that block
> all ICMP are even more silly. Why on earth Microsoft, who must know about
this
> problem, block ICMP on their kit I don't know...
>
> Most if not all dialup has an MTU of 1500.
>
> --
> Ryan O'Connell - <ryan at complicity.co.uk> - http://www.complicity.co.uk
>
> I'm not losing my mind, no I'm not changing my lines,
> I'm just learning new things with the passage of time
>
>