Randy Bush <randy@psg.com> suggested a URL about dynamic relocation and the DNS at: http://ops.ietf.org/dns/dynupd/secure-ddns-howto.html Its very interesting and a bit over my head, perhaps. Maybe its a <>"friday" document! "Why Dynamic Update? Dynamic update proposes to provide a workable solution to the seemingly trivial operation of exchanging data between two computers with known names both visiting a foreign network where we don't know, care or trust the underlying address. This feature has long been available for specific platforms, but a general OS-agnostic method has been lacking." Especially the crypto components I find pretty complex but one thing I know is that its *not* a "trivial operation". Especially when you start to consider how little you might know about the network your on. It seems like there must be loopholes all over for intentially letting your app fail to do a thing so the story of how it failed reveals things that have security implications. Very interesting! Dan