One to one Nat

I'm using shorewall and I've been assigned to a new public IP block.
The current setup is one to one static nat for two of these old public
IPs to some internal servers. Can I simply add two new entries for
the new IPs translating to the same internal IPs? The reason I want
to do this is because one of these is a mail server and I want to
avoid any disruption during the MX and A record change. It seems
logical that I could nat two different addresses on an interface to me
but I'm still pretty green in this area and I'm afraid I might be
missing something. Can someone please confirm that this sounds ok?

TIA,
Dave B.

dboltz wrote:
> I'm using shorewall and I've been assigned to a new public IP block.
> The current setup is one to one static nat for two of these old public
> IPs to some internal servers. Can I simply add two new entries for
> the new IPs translating to the same internal IPs? The reason I want
> to do this is because one of these is a mail server and I want to
> avoid any disruption during the MX and A record change. It seems
> logical that I could nat two different addresses on an interface to me
> but I'm still pretty green in this area and I'm afraid I might be
> missing something. Can someone please confirm that this sounds ok?

Some services don't like it if you call them by one server name when
they're on another server. Mail services tend not to care, though. You
should be OK.