getting my IP to resolve as my hosted Domain(s), not my ISPs hostmask

[pl1ght]

I host 3 domains from my server at home. I have a static IP on DSL. Now, Im basically trying to figure out how i can have my external ip lookup to www.xxx.com on my server, instead of user.xxx.xxx.com, which is my ISPs hostmask.

For example on IRC so it (my hostmask) would show up as the domain im serving.
If there is anyway to do this, i would assume it has to do with Reverse DNS. If someone could point me in the correct direction on how to do this i would be greatly appreciative.

Hopefully this wasnt too confusing. Le tme know if i need to clarify.

[bastard23]

pl1ght,
You are right that it is Reverse DNS. Your ISP is the Authority on the IP addresses you use. Look at the in-addr.arpa domain. Try running host -v <your IP address> to see what it says currently. Look at the Linux DNS howto at www.tldp.org and the DNS howto at http://www.intac.com/~cdp/cptd-faq/

After you get your DNS server running, set it up to be authoritative for your IP addresses. Once that is working you'll have to contact your ISP to get them to update their DNS server. They will update it to point to your domain name (you can get only one.)

Good Luck,
chris