I am a relative newcomer to networking (and my current employer), and want to understand whether our present set up is okay, or not.
We have 8 static IPs provided by our ISP. We have a Windows SBS 2003 server with 2 NICs - one on the public side, with one of our static IP addresses; and one on the LAN with a number in the 192.168.100.nnn range. This all seems normal for SBS 2003.
The SBS is used as our gateway and has an ISA firewall running on it. The router/modem, on the public side of the SBS, shows its LAN IP as being another one of our static public IP addresses. On the WAN side of the router, the IP is, as expected, a public number, but not within our range. I can only assume that this was also provided by our ISP, and will be asking them as such.
With the above in mind:
Is the use of a public IP on the LAN side of the router because the router is effectively outside of our LAN?
If not, is this use of a public IP address on the LAN side of the router okay?
Thanks in advance.