[support] home agent on dummy interface

[Romain KUNTZ]

Hi Jeff,

On 2009/02/23, at 17:43, Jeff Napper wrote:
> Greetings, all. I have a newbie question on setting up a virtual  
> home agent.

Do you mean a Home Agent with a virtual home link?

> According to the NEMO Howto, the Home Agent can be placed on a dummy  
> interface (or simply an alias on the lo interface I'd guess).

Yes, the home link can be emulated with a dummy interface. Note  
however that it does not work with the loopback interface.

> However, when I set this up, the HA cannot send packets because the  
> dummy intf. doesn't allow outgoing packets not addressed to itself.  
> In fact, the error is EPERM for the sendmsg() call for sending the  
> BA. Is there something I'm missing in the routing somewhere or is  
> this just not possible anymore?

First, BA are not supposed to be sent through the dummy interface,  
they should be sent via the interface connected to the Internet, in  
order to reach your mobile node located somewhere in your network.

Or did you mean RA? I've tested on a 2.6.22 kernel and I could send RA  
(with radvd) over the dummy interface. What is your configuration and  
how did you create your dummy interface?

Regards,
-- 
Romain KUNTZ
kuntz at lsiit.u-strasbg.fr
LSIIT - Networks and Protocols Team
http://clarinet.u-strasbg.fr/~kuntz/