dd-wrt pptp iptable rules

[chris.blazek at gmail.com (Chris Blazek)]

I'm trying to limit IP access to a pptp server on a dd-wrt vpn router. I've
got iptable rules that should do the trick.

I'm having a problem finding where to modify the rule sets to load my
version of the iptable rules.
I have found the file /tmp/.ipt that seems to have all the iptables shown
with iptables -L.

The problem is, everything in /tmp is rewritten when "apply changes" is
clicked on the web interface. I've had no luck fgreping to find 1723 or 47
in the filesystem.

I would rather not leave pptp wide open for whoever to try and exploit. Is
there anybody out there that has had experience with this or a suggestion
for another method to accomplish what I'm wanting?

Currently I'm running on a wrt150N with:

DD-WRT v24-sp2 vpn (c) 2009 NewMedia-NET GmbH
Release: 10/10/09 (SVN revision: 13064)


Thanks in advance!

Chris
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