Question - LAN addresses and Port Forwarding

[Jim]

I'm running 3 Windows XP Pro computers and 4th system with Windows Home
Server. In addition, one of the XP computers is running an IIS Web server.

As long as my port forwarding is correct, everything works fine. The problem
is that occasionally the internal addresses of these computers changes from
time to time causing me to reset the port forwarding (192.168.1.100 may
change to 192.168.1.101 etc).

Two questions:

How can I keep these addresses from changing
Is there a simple way to display all internal system addresses without out
going to each computer and using ipconfig.

Suggestions greatly appreciated.

 

[Chuck [MVP]]

I'm running 3 Windows XP Pro computers and 4th system with Windows Home
Server. In addition, one of the XP computers is running an IIS Web server.

As long as my port forwarding is correct, everything works fine. The problem
is that occasionally the internal addresses of these computers changes from
time to time causing me to reset the port forwarding (192.168.1.100 may
change to 192.168.1.101 etc).

Two questions:

How can I keep these addresses from changing
Is there a simple way to display all internal system addresses without out
going to each computer and using ipconfig.

Suggestions greatly appreciated.

Port Forwarding is a crappy solution on a LAN using DHCP. You have 2 solutions.
1. Disable DHCP. Use fixed IP addresses.
2. Use UPnP aware applications and router.

http://networking.nitecruzr.net/2006/01/nat-routers-with-upnp-security-risk-or.html

You can use PSExec to run "ipconfig /all" while sitting at one computer, against
all computers on your network. PSExec is part of PSTools, a SysInternals /
Microsoft free product. You can script the running, and parse the output if
you're good at writing scripts.

http://networking.nitecruzr.net/2005/05/essential-tools-for-desktop-and.html#PSTools

 

[Jack-MVP]

Hi
Give the computers Static IPs (which is the preferred way to configure
servers).
Or use a Cable/DSL Router that can do IP reservation within the DHCP (Aka
Static DHCP)..
Running this free Utility would show you the IP scheme of your Network.
http://www.softperfect.com/products/networkscanner/
Jack (MS, MVP-Networking)

 

[Jim]

Thanks fellows.