Timothy Murphy <gayleard at ...> writes: > > KevinO wrote: > > >> I would like the server with a dynamic IP address > >> to be accessible through a fixed name. > >> > > Setup an authoritative DNS server on the server that has a fixed IP > > address to host records for the site(s) on the server that has a dynamic > > IP address. > > > > Create a local scheme (such as a script, etc.) to periodically determine > > the current dynamic IP address and keep the records on the DNS server > > correct. You'll want to set the TTL (of the records) to a low value so > > caching name servers will update the information fairly often. > > But would this "home" DNS server provide records accessible to others? > If in fact it is straightforward surely it must be set out > explicitly somewhere? > > Incidentally, I do already check every 15 minutes if the IP address > of the dynamic-address server has changed - it changes every few days - > and if it has the remote server sends me email. > Be aware that the actual "owner" of the dynamic IP address is still authoritative for reverse look ups. This means that some uses of a system with a dynamic IP address are problematic (e.g., mail server) since the reverse look up fails. Other uses (sshd) in theory work but folks have to continually update their ssh saved keys for that system whenever the IP address changes. Cheers, Dave