Port-Forwarding

Hi! My problem is, that my server will get another IP. Because my ISP cannot (or will not) change the TTL in the DNS and I don't like to wait 2 days until the server will work again. My idea is to install a second machine with the old IP and forward all incoming requests to the new IP, until all DNSs have the new IP. How can I forward all incoming requests for ports 21, 22, 25, 80, 110, 443, 995, 3306 to another server on the new SuSE 7.3-Box? Will there be problems with virtual hosting (apache) or other services? Boris.