Date: Thu, 11 Mar 1999 13:11:48 +0100 From: Stefan Bethke <stefan.bethke@hanse.de> To: Andreas Klemm <andreas@klemm.gtn.com> Cc: Hellmuth Michaelis <hm@hcs.de>, freebsd-isdn@FreeBSD.ORG Subject: Re: repeated unsuccessful dialups with costs (!) with fbsd 3.1 (i4b) to Cisco Message-ID: <607173.3130146708@d225.promo.de> In-Reply-To: <19990311125552.A3583@titan.klemm.gtn.com>
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Andreas Klemm <andreas@klemm.gtn.com> wrote:
> I don't find a way to tell tcpdump to monitor PPP ...
It should work.
> I use tcpdump -i isp0 -w xxx
> tcpdump -r xxx
> tcpdump -e -r xxx
>
> But all I get is for example:
> root{201} /tmp tcpdump -e -r xxx
> 12:50:48.618017 ID-000 IP: pppak04.gtn.com > gtn-gw2.dpn.de: icmp: echo
> request 12:50:48.724928 ID-000 IP: gtn-gw2.dpn.de > pppak04.gtn.com:
> icmp: echo reply 12:50:49.635423 ID-000 IP: pppak04.gtn.com >
> gtn-gw2.dpn.de: icmp: echo request 12:50:49.753914 ID-000 IP:
> gtn-gw2.dpn.de > pppak04.gtn.com: icmp: echo reply
Seems you ran tcpdump too late (after successfully logging in).
> Something special needed ???
Try to run tcpdump, and then establishing the connection. Be sure to start
tcpdump with -n to avoid name lookups, which in turn might bring the line
up, and thus spoil the dump.
Also ask your provider for hints from the dial-in server's log, why
authentication might be failing.
Stefan
--
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