Filtering with iptables based on DHCP leases

[Carl-Eric Menzel <cm.debian@users.bitforce.com>]

Hi,

I'm running a small ethernet network in the 192.168.1.x range, with
firewall and router in one Debian box on 192.168.1.1. eth0 is LAN,
eth1/ppp0 goes to the ISP.

The LAN machines get their configuration from a DHCP server that also
runs on the router box. What I'd like to do now is to block all router
access to machines that did not get their IP from the DHCP (i.e. those
with static IPs). Is there any hook in dhcpd that lets me trigger
iptables commands?

Thanks
Carl-Eric
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