Date: Mon, 26 Nov 2001 20:57:38 -0500 From: "Matthew Emmerton" <matt@gsicomp.on.ca> To: <freebsd-net@freebsd.org> Subject: Very strange network behaviour - can anyone help me analyse tcpdump output? Message-ID: <004801c176e6$e57a2eb0$1200a8c0@gsicomp.on.ca>
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Hi all,
In the continuing saga of IPSec over PPPoE for a retail POS environment that
I'm maintaing, the problems seem to become more complex as time goes on.
The network is quite simple:
[ LAN #1 ] - [ FreeBSD Gateway #1 ] - [ ISP ] - [ FreeBSD Gateway #2 ] - [
LAN #2 ]
Both LANs connect using PPPoE with the same ISP, and are one hop apart
(according to traceroute).
The problem is that a connection from the Internet (anywhere) to either of
the FreeBSD gateways will "hang". Usually I can login but doing an 'ls -al'
will display a few lines of text and then nothing. This happens using a
bunch of telnet clients (Anzio on Win2K, Win2K and Win95 native, FreeBSD)
from various ISPs, as well as *between* the gateways, so the problem is most
definitely related to the ISP providing us service. However, they seem to
think that it's our problem ("none of the customers that use Windows have
this problem -- must be that Unix thing that you're using").
I have an ethereal trace of a hanging telnet session from my desktop to one
of the gateway machines, and the corresponding tcpdump trace of the same
session on the gateway. Since I'm not too familiar with TCP/IP at such a
low level, I was wondering if anyone would be willing to take a look at the
two dumps and see if there is anything strange going on.
Thanks,
--
Matt Emmerton
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