One more service for Dynamic dial-up IPs

The best site I know to allow you to have a CNAME for your dynamic dial-up IP is DynDNS (www.dyndns.com). Especially, the basic service is free of any charge.
If you want another service, I have recently tried indeed:

No-IP (www.no-ip.com)

It supports a fairly easy client, named noip. The version I have tried is noip-2.1.4, and it worked smoothly after compilation.

./configure
make

A command is available to generate the configuration file (noip -C). Then I have launched it with maximum debug output:

[henrique@fuji noip-2.1.4]$ ./noip2 -c noip-test.conf -d -d -d -d -d

I have no idea about the algorithm behind, but it queried the no-ip server with a reasonably scrambled username / password. Something I have never seen with other services.