> > On 27.01.09 08:46, Al Stu wrote: > > > So then you disagree that the following example returns a valid address > > > record for srv1? > > > > > > srv1 300 IN A 1.2.3.4 > > > mx1 300 IN CNAME srv1.xyz.com. > > > @ 300 IN MX 1 mx1.xyz.com. > > > > > > 1) Select Target Host: > > > The MX query for xyz.com delivers mx1.xyz.com which is a CNAME. > > > > > > 2) Get Target Host Address: > > > The A query for mx1.xyz.com delivers the address (A) record of > > > srv1.xyz.com, 1.2.3.4, and also delivers the alias (CNAME) record of > > > "mx1.xyz.com".
> In article <glnemv$10n...@sf1.isc.org>, > Matus UHLAR - fantomas <uh...@fantomas.sk> wrote: > > They are two queries. If mx1 would be an A, it would be returned in the > > first query. Since it's a CNAME, the IP is not returned in the MX query. On 27.01.09 23:51, Barry Margolin wrote: > So what? If the IP isn't in the additional section, the client will do > its own A query. so the client has to do an A query, because A is not returned in the MX query. > There's no requirement that the response to the MX record include the A > record. It's nice if it does, since it saves a query, but this is just > an optimization. exactly. That's what I was trying to explain. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. Windows 2000: 640 MB ought to be enough for anybody _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
