Re: A router bug?

Alan Cox (alan@lxorguk.ukuu.org.uk)
Sun, 31 Jan 1999 14:52:44 +0000 (GMT)

> > tcpdump the internet side interface of the box you are dialing into you
> > will see it sending back ICMP unreachable (fragmentation required) messages.
>
> no. i see TCP payloads.

You are looking in the wrong places. What is happening is this

Linux -> Remote TCP SYN
Remote -> Linux TCP SYN ACK
Linux -> Remote TCP "GET /blah HTTP/...."

1:

Remote -> Linux 1500 bytes of data

Slip server -> Remote "Must fragment"
Firewall of Remote Dropped

goto 1

If you think this isnt the case get me a set of tcpdumps of the session,
dumping the requesting host, then internet and the host side ports of the
router you claim is buggy.

Alan

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