Hi John,
Welcome to the Linux-world .-)
Your System now:
Actually your Linksys part is a router that
performs the function of:
(1) a gateway (with nat ?)
(2) a 4 port switch for your
(3) internal WIN2k Server.
LINUX based SME can do (1) and (3) but not easily do the switch part .-)
My recommendation:
Get rid of the WIN2K server ... convert it into an SME server
* set up the SME as gateway and server with two NICs
...that gives you internet routing, a nat firewall, a mailserver, a Samba file & printserver
_and_, most important for you an Apache + mysql server for the outside world
...setup is really easy (burn iso, boot cd, answer .-)
* from now on use only the switch part of your linksys and plug the modem cable directly into the outside NIC of your SME.
THE RESULTING SETUP SHOULD BE A PERFECT SYSTEM
to learn about http based sql database serving...
...even with just 16k of outgoing bandwith.
Basically only html will be transmitted in&out so expect your pages at twice ISDN speed ... slow... but ok for a user or two ... IF your SME (database PC) is fast enough for the queries (BIG Databases need RAM and fast disks).
HTH