default routing question ZIPB ADSL PPPoA

[Lowell Gilbert]

Ahnjoan Amous <ahnjoan at gmail.com> writes:

> The short : I believe the problem I am having is due to routing. A DHCP
> server sends me IP A.B.C.D with a default route of A.B.C.D. "dhclient" isn't
> handling this well and I don't know how to fix it. Windows as well as Linux
> DHCP clients do not have a problem with this and I am at my wits end trying
> to figure out what combination of route commands will fix my issue.
> 
> The long : I have a CellPipe ADSL router/bridge from Lucent. This device is
> provided by our ISP. I am exploring the ZIPB functionality of the device to
> allow my FreeBSD host to own the public IP. The basics of the configuration
> for those unfamiliar is as follows. PPPoA is established by the device and
> the the (public) IP acquired through the previous process is delivered to a
> host behind that CellPipe via DHCP. After DHCP the device acts as a
> "bridge", allowing the internal device to use the public IP as its own. I'm
> sure this description is vague but I don't know any other way to explain.
> 
> Info : After dhclient acquires its info the ethernet interface looks like
> this
> ifconfig ethernet interface √ inet A.B.C.D netmask
> 255.255.255.255<http://255.255.255.255/>
> 
> When I connect a windows or Linux host they seem to treat the interface as
> the default route and work as expected. With FreeBSD I have tried removing
> all routes for the device after assignment, and then adding default route
> based on -interface flag for route command. I have also tried opening up the
> netmask on the ethernet interface and adding a default route destined for
> what I know the PPPoA connections end point is.
> 
> Nothing I have tried seems to work. I don't consider myself an expert by any
> means but this is clearly beyond my knowledge.
> 
> I'm happy to provide any information you need it you have an idea.

Sounds like it's "really" an "unnumbered" interface.
Did you try the "-iface" option to route(8)?