Getting a constant hostname without paying for static IP's from your
AFAIK, this is 100% legal, and doesn't really exploit any sort of
Just sign up with dyndns.org, or other similar organization. They
will provide a mapping from a consistent name, to whatever IP you've
DHCP'd to most recently.
Recent DSL/Cable routers include built-in support for sending your
new IP address to such services. (EG Linksys WRT54G)
Older DSL/Cable routers may require a cron job that performs
basically the same function, by periodically polling your DSL/Cable
router, and sending the address to the dynamic DNS service. (EG Linksys
I really like always being able to ssh to my home box with just "ssh
-X stromberg.dnsalias.org", instead of having to somehow log what my new
address is and/or portscan my ISP's address range.