RE: Multihoming by IP Layer Address Rewriting (MILAR)

["marcelo bagnulo" <marcelo@it.uc3m.es>]

> > > > It doesn't tell the other end what addresses you might be coming
from though.

> > > Good point. But this information could easily be carried in an IP
option.

> > surprise surprise - that's what I'm proposing :)

> But you are proposing this in both directions, which is somewhat more
> problematic: you can only send an IP option if you can send period... But
> you could try each of the different addresses, of course.

If I understand it correctly this could be a good trade-off solution.

In a large portion of cases, a DNS query is performed before connection is
established, so this could be a place where to include all the addresses of
the target host, because no extra query is usually requiered.

However if we want to use DNS to obtain source host address set, this would
requiere an extra DNS query which may not be desirable, so source address
set can be carried in the IP prefix option.

In addition, the IP prefixes option could include a flag which indicates
whether the source host has a target address host available (it got it from
DNS) or not, so that the target host can include or not a IP prefix option
in the SYN-ACK packet. This option could be included anyway to override the
existent address set.

Regards, marcelo