DHCP Relay over transit-network

Muenz, Michael m.muenz at spam-fetish.org
Tue Dec 30 10:15:45 UTC 2014

Hey list,

I'm not an expert regarding dhcp relay, but I unterstand the principle 
and got it running when DHCP server is at the other interface of the 
Now I have 2 networks, connected at 2 firewalls which have a transit 

LAN1: - FIREWALL1 --- transit --- FIREWALL2 - LAN2:

In both networks (LAN1, LAN2) is a DHCP server and has to be the 
failover for the other one, configured via delayed replies.
When I start dhcp-relay on FW1 with "/usr/local/dhcp/sbin/dhcrelay -i 
eth1", I can see the packet on FW2 going to, but 
with the source ip
The dhcp-server on LAN2 doesn't reply to this one.

Can dhcrelay work with this setup in general or isn't this possible?

Searching the web only shows me results when the dhcp server is 
connected to the same firewall on another interface.


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