reverse lookups

[Kevin Darcy]

You can have multiple PTR entries for an address, but applications only
look at the first one in the list, so it's a waste.

It shouldn't matter anyway. If reverse lookups are being used for
(weak) authentication, the remote server is going to do the reverse
lookup, get a name, and then do a forward lookup on the name to verify
that it matches the IP address. You don't need multiple PTR's for this
to work. You just need to make sure that whatever each PTR points to has
a matching A record.


- Kevin

djebli at hera.med.utoronto.ca wrote:

> Hello everyone;
>
> We are in process of moving ourdomain.foo.com to ourdomain.com.
> We want to do this gradually which means that we have to serve
> both domains for a while.
> The direct maps are not a problem, if one does a lookup for
> system.ourdomain.foo.com or system.ourdomain.com will get the same
> IP address.
> However, the reverse lookup map is one. Can we have 2 PTL entries
> in the reverse map, like a CNAME in the direct map.
> We are running 8.2.
>
> Any help would be appreciated.
>
> Abdu
> djebli at hera.med.utoronto.ca