I have pppd 2.3.10 and 2.2.13 kernels doing dial-on-demand + IP
Masquerading for a couple of small networks. The problem is that inevitably
one of the users on the network will install some networking software (ICQ,
PeopleLink, whatever) that causes pppd to dial out and keep the line up.
What I normally do is use ipchains to REJECT requests to/from certain IP
addresses and ports. That works nicely. The tricky part is figuring out
which IP addresses / ports are causing the problem.
It's not DNS packets. I've configured the machines as small-time DNS
servers - which obviously do cause the line to go up occasionally but
that's fine. I've set named's heartbeat so that it does housekeeping about
once a day.
What I'm looking for is a way to log the source & destination IP addresses
& ports for packets that are causing the line to go up. I had a quick look
at demand.c but I couldn't see anywhere obvious to put code to do this kind
of logging.
Any ideas? Pointers? Suggestions?
bye
John
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