two external IP addresses one dns name?

March 16, 2010 at 09:19:58
Specs: Windows XP
we are installing a new T1 with a new external
IP address.

we have an internal FTP server which we want
available during the transition between the old
IP and the new IP DNS name propagation.

when we will change the DNS to the new IP
address there will be 24 hours of propagation
of the DNS name to the new IP address.

can we add a second (the new) IP address to
the existing (old) ip address in the DNS name
( this way while the
new IP propagates the old IP will still be up
serving the requests?

ip#1 -->
ip#2 -->

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March 16, 2010 at 12:19:48
yes, absolutely. just create a new A record (or CNAME or whatever) for ip#2, then delete the record for ip#1 after the switchover. just as you described.

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March 16, 2010 at 12:30:42
thank you.
i just realized my scenario may not be available to me,

router#1 which is the old IP has to come off the network when i
plug router#2 which is the new IP.
how can i have both IPs (routers) connected to the same LAN?
i have a cisco 3620 for router#1 and a cisco 1841 for router#2

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