[ILUG] tcp logging on ppp connection

[Kenn Humborg]

> Hiya,
>
> What is the best way to start logging tcp traffic once a ppp link has been
> bought up by pppd?
>
> What I want to do is start:
>
> tcpdump -i ppp0 -w somefileorother
>
> immediately after the ppp link is established.
>
> The machine I want this to run on, is acting as a test ppp dialin sever.
>
> I had a go at adding "record logfile" to the pppd options, but
> unfortunately, when I run this through tcpdump, it barfs. I want a logfile
> which can be read by tcpdump, and ultimately ethereal.

Would putting the tcpdump command in /etc/ppp/ip-up (or ip-up.local)
get the info you want?  You'd miss the very early connection
options negotiation stuff.

Later,
Kenn