Problems with destination IP of DHCP Offer Packages

[Glenn Satchell]

>Date: Sat, 11 Jul 2009 17:59:41 +0200
>From: "Martin Krellmann" <martin2002 at web.de>
>
> Hi.
> 
>  
> 
> I am running dhcp server 4.1.0. It is listening directly on interface
> "ipsec0" which is the interface of an ipsec tunnel. I need to send DHCP
> offers out over this interface.
> 
> I am not using an relay agent because openswan, relay agent and dhcp server
> are then running on the same host and I could not get the internal routing
> from the relay agent to the server working.
> 
>  
> 
> Let's say remote clients should get an ip address out of the subnet
> "10.0.1.0/24". The ipsec server adds an route to the destination
> 255.255.255.255 on interface "ipsec0" so broadcast packages should be
> transmitted over the tunnel. The problem is that the dhcp server does not
> broadcast the offers but sends them to the IP that should be assigned to the
> client. So the package will never be routed over the ipsec tunnel and the
> client gets no ip address.
> 
> Is this a configuration problem or is this a default behavior?
> 
>  
> 
> Greets,
> 
> Martin.

when dhcpd start up it there a line indicating that it is listening on
interface ipsec0? Something like one of these (this is on Solaris, but
most of the line should be close to yours) :

Listening on DLPI/hme0/08:00:20:b0:eb:e3/192.168.14.0/24
Sending on   DLPI/hme0/08:00:20:b0:eb:e3/192.168.14.0/24
Sending on   Socket/fallback/fallback-net

regards,
-glenn