Internet Sharing and machinename.local

Hi! I've recently set up my Mac mini (10.4.6) to run Internet Sharing, and ethernet connections to any laptop I connect works beautifully. (For exactly what I did to get this set up, visit http://www.aleph0.com/computing/macosx/dhcp-setup/ , but nothing there is really beyond the basics you might expect.)
One tiny feature I don't have working is the ability to connect the "internal" computer and the mini using aliases---only IPs are possible. For instance, the "Sharing" panel suggests other computers can connect to the mini as "natalie.local"; similarly, when I connect a Windows laptop named "will" to the mini, /var/db/dhcpd_leases even shows it's connected as will---but I can't connect from one to the other using those names. (i.e., via http---both are running web servers---or via sftp---both are running sshs as well), while connecting with the numerical IPs works fine.
So after that ramble, I wouldn't be surprised if "natalie.local" is really only suppose to work with AFP, and will with SMB, but thought I'd ask for suggestions. I've considered playing with DNS on OS X to work on such a possibility, but I thought I'd ask first....
Thanks for any pointers!
CDJ
Mac mini (Original)   Mac OS X (10.4.6)   Running Internet Sharing (connected to Internet via AirPort, "internal" via ethernet)

Otherwise run your own dns server on your LAN.
This is what I expected to have to do on the mini---I have a DNS server, but the mini with Internet Sharing doesn't send any information to it; that's what I'd like to figure out how to do. Perhaps stepping back and stating the basics of what I'd like would help:
I have a mini running 10.4.6 (natalie), connected (via the rest of my home LAN) to the Internet via AirPort, and the ethernet jack is unused. I'd like to connect a laptop (will) (that uses DHCP, but OS- and software-unspecified) via ethernet to the mini, access the Internet, and allow the two machines to address one another as "natalie" and "will" (or "natalie.local" and "will.local", etc.) for TCP/IP commands, instead of "192.168.2.1" and whatever address is assigned to will. This works after installing Bonjour on will, but I'd like to not have to install Bonjour on the laptop (specifically, I'd like to connect any random laptop that can use DHCP).
Am I wrong in thinking there should be a way for natalie to "take over" this portion of the DNS, or at least update my LAN's DNS server so that the process is still seamless for will?
Thanks again,
CDJ

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