I have a bind9 server, can that make use of standard dyndns protocols somehow (even via a separate daemon)?
http://etbe.coker.com.au/2010/12/08/dynamic-dns/
I use BIND and some shell scripts for this, the above blog post describes what I'm doing. I haven't made any change of note over the last two years so it works well.
Thanks for that. It validates my approach somewhat! On the subject of the -k option - that worked fine for me in testing while the .private and .key files were in the same directory. As soon as I copied the .private key file to another directory (without the .key file), bind gave me some funny syntax errors. I'm not sure if it was the absence of the .key file from that directory or what, but specifying the key as part of the nsupdate script makes a lot more sense - only one file to protect and not visible on the command line from ps. Thanks James