Firewall

Hello all:

We have had to setup new offices and a new LAN.

This LAN does a dial up connection to the Internet, using a shared modem and a
Windows 2000 domain server.

The users are running a mixture of Win 98 and NT.

At this stage I am looking for some type of firewall security that we can afford on the Win 2000 server.

Firewall 1 and similar are not affordable.

Could someone please advise me here.

Very much appreciated and regards

Leon Williams