SUMMARY: Most answers centered around what was unfortunately a miscommunication on my part. The actual host IP addresses are not going to change, as they are NAT'd. So a lot of answers mentioned DNS and DHCP and other helpful things to do so as not to have to renumber the host IP addresses. Fortunately, that will not have to be done. However, it looks like there is really no way to avoid changing DNS entries for all the relevant domains every time we switch colocation facilities and therefore IP addresses. Just remember to crank to refresh interval down near "switching time" and hope not too many sites cache DNS entries longer than they're told to. The other summarization is that Sean is a curmudgeon and equally abusive to most everyone. Thanks to most everyone for helping and Sean for being a curmudgeon. Mark J. Scheller (scheller@u1.net)