(usagi-users 03653) Re: Multicast on loopback

[Bruno STEVANT <bruno.stevant@xxxxxxxxxxxxxxxx>]

Thanks David for this insightfull answer.

Basically, I was surprised by the different behavior between FreeBSD  
and Linux. I thought that something was missing in multicast handling  
for loopback in usagi. But maybe I am putting too much confidence in  
the FreeBSD stack ;) I will try to get a more precise idea by digging  
RFCs :] I will also try to look for another architecture where DHCP  
will not run on loopback ...

Thanks for your help !

--
Bruno STEVANT - Point6

Le 11 avr. 06 à 20:14, David Stevens a écrit :

> > The error we are tryong to avoid occurs later, when dhcpv6 try to
> > send a message
> >
> > > ./dhcp6c -dDf lo
> > [...]
> > Apr/11/2006 18:45:47: client6_send: transmit failed: Network is
> > unreachable
>
>         I don't know if it's relevant or not to your problem, but
> loopback, by default, is not multicast-capable, and it also does
> not have a MAC address (used to generate the client ID). And, of
> course, there isn't much use in running DHCP on loopback. :-)
>         "ifconfig lo multicast" appears to set the interface flag,
> though I don't know if that means it works properly. The client
> I have fails on "lo" with error messages "doesn't support
> hardware type 772", "failed to get hardware address", and
> "failed to get a DUID" (in that order).
>         You can use "strace" to find out specifically what it did,
> but my guess is that it's a bug in the application.
>
>                                                 +-DLS