DHCP relay & IPoIP tunnel
vincent.catros at laposte.net
Mon May 23 08:33:36 UTC 2011
I have a problem with my DHCP relay and it seems to be related to IPoIP tunnels.
The relay has 3 ethernet interfaces.
- eth0 is connected to LAN-1 (subnet 192.168.0.0/24).
- eth1 is connected to LAN-2 (subnet 192.168.1.0/24).
- eth2 is connected to the upstream network (subnet 192.168.2.0/24).
On eth2 I have an IPoIP tunnel and, hence, a "tunl1" virtual interface.
"tunl1" @IP is 192.168.3.2
the other end of the tunnel is 192.168.3.1
The routing configuration of my network and my relay is such that the downstream and upstream trafic from/to LAN-2 pass through the tunnel.
My relay is on a Linux Debian Squeeze
version of ISC relay is 4.1.1-P1
The command line I run is :
dhcrelay -d -i eth0 -i eth1 -i eth3 192.168.31.1
For LAN-1 every thing works properly.
The problem is that DHCPOFFER to LAN-2 (through) the tunnel are not forwarded to the client.
dst.addr of the packet is good (192.168.1.1). The packet seems well formed (yourip is 192.168.1.2 chaddr is good)
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