windows dns

Hello all

well im trying to setup dns on windows 2003 here what i got so far

location 1
windows 2003 dns installed dhcp vpn iis ftp

location 2
same as above

what i want to do it build a dns record on 1 to point to location 2

location 2 = 127.0.0.1 example

ive setup the A record, but location 2 has a dynamic ip, i set to allow the record to be updated on location 1, but how i can location 2 to give the new ip to location 1? there over wan btw

thanks