Re: DNS based Destination Selection

[David Gethings <davidg@pipex.net>]

On Wed, 2003-06-18 at 17:58, Jay Ford wrote:
> My quick reactions:
>    o  DNS is too high a level for (srcaddr,dstaddr) selection;
>       not everything goes by name
See my response to Cedric

>    o  DNS changes are difficult->impossible to get deployed globally
>    o  for some cases, relying on remotely-maintained DNS information is not
>       sufficient or desirable
I agree that they are not easy, but this method is used for MX records.
I agree that by adding the priority value to the AAAA & A6 records
alters the purpose. But I do not see this as being a major sticking
point.

>    o  you cover dstaddr selection; what about srcaddr selection?
One thought I have just had (so I have no idea how good or bad this idea
is) is if a source is also multihomed it can perform PMTU discovery for
each of the IPv6 addresses it has in that scope. The source address to
use is determined by which ever returns the best PMTU and RTT.

This is a slight waste of bandwidth. But if the "best" possible path is
your ultimate goal there have to be trade offs.

Cheers

Dg