Filtering DHCP Requests so that ICS DHCPD don't get them

Scenario:
Mobile System with two nic's,
firewall and NAT serving DHCP and some services to internal network
Getting external IP with dhcp client.

Issue:
dhcpd replies "DHCPNAK" to external interface

Config:
ICS dhcpd requires all available nic subnets to be configured, but when
a range does not have any options, the server sends a DHCPNAK, which is
bad when I hook this system up on network which already have dhcp
servers serving that range..
I have tried various things with IP tables blocking udp 67/68, but I
can not seem to find a way to allow my system to be a dhcp client on
the outside network while blocking traffic or not responding at all as
a dhcp server on that side...

Anyone solved this before?
My tests are a bit bozarre as it looks like when I drop all udp 67/68
packets are still reaching dhcpd..

.

Relevant Pages

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