query-source for multiple interfaces
Mark Andrews
Mark_Andrews at isc.org
Wed May 17 23:49:12 UTC 2006
> In article <e4feh9$12k9$1 at sf1.isc.org>,
> Sam Wilson <Sam.Wilson at ed.ac.uk> wrote:
>
> > Looking at the ARM the "query-source" option seems to be able to specify
> > only one address. We are investigating anycast DNS on multihomed
> > servers. It looks as though I can't use "query-source" to allow queries
> > to be sent from any address except the multicast address. Is this true
> > and is there any obvious workaround? I've already thought of adding a
> > second local /32 address that's specific to the box and sourcing the
> > queries from there, but that's getting rather messy.
>
> If the anycast address is an alias IP, I don't think you need to do
> anything. I think the OS will automatically default the source address
> to the primary IP of the outgoing interface rather than an alias.
>
> --
> Barry Margolin, barmar at alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not directly to me ***
> *** PLEASE don't copy me on replies, I'll read them in the group ***
Also it does not make sence to send queries from a anycast
address as the replies are not guarenteed to go back to the
correct instance.
For local anycast the you can sometimes get away with it
if the load balancer / router has enough smarts to get the
reply to the right instance. Even then you it need to map
both UDP and TCP connections to the same instance.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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