Re: clue for the clueless please

["Peter Galbavy" <peter.galbavy () knowledge com>]

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.

Will let you know if this is the problem.

rgds,
--
Peter Galbavy
Knowledge Matters Ltd.
http://www.knowledge.com/
----- Original Message -----
From: "Ryan O'Connell" <ryan () complicity co uk>
To: "Peter Galbavy" <peter.galbavy () knowledge com>
Cc: <nanog () merit edu>
Sent: Tuesday, January 23, 2001 12:10 PM
Subject: Re: clue for the clueless please


> On Tue, Jan 23, 2001 at 10:36:33AM -0000, Peter Galbavy wrote:
> > The problem is the redirection from authentication -> mailbox. It just
> > hangs. Tested with multiple browsers (lynx included ;) and all the same.
>
> What does telnet to port 80 reveal?
>
> If you can get short queries back (E.g. HEAD / HTTP1/0) but not longer
> queries it sounds like a PMTUD problem. Does the new customer have Frame
> Relay or any other links with MTUs less than 1500?
>
> Windows sets the DF bit on outbound packets, and I believe Microsoft
> filter PMTUD ICMP packets.
>
> --
> Ryan O'Connell - <ryan () 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