Cable modem / network problem

[nell1]

Setup;

cable modem connected to SMC Barricade router, connected to switch on network.

Computers on network have IP address range 172.21.2.1 - 254
Router IP = 172.21.2.17, this being the gateway in the networked pc's network setup.

I have configured all the other pc's on the network with these settings, however 1 pc (running xp pro) will not work. I have double checked and all the settings are as per the other terminals.

I have the browser and mail programs to initiate a normal dial-up connection if the LAN connection cannot be found and this is what it appears to be doing. I have checked the connection to the LAN and everything is fine.

It seems as though it cannot find the LAN connection and goes for the dial up....

Very confused..

Any help gartefully appreciated!!

Nell1

 

[bcastner]

From a command prompt do an ipconfig /all and post the results here.

 

[nell1]

bcastner,
Thanks for the reply. I have figured out the problem. I had entered the wrong DNS addresses.. looking so hard could not see the obvious... doh!

Cheers anyway!


Nell1

 

[bcastner]

You might consider letting the router do its DHCP service function.

I have no doubt your setup will work, but it would be easier on your LAN side traffic to not have to resolve DNS issues WAN side for local addresses, and there is a firewall protection from using NAT.

And, as well you can mix the too. Some fixed IPs for server uses, DHCP for the rest.

 

[nell1]

To be honest I have inherited the network setup from somebody else. I am not a network guru but have never understood why the previous person assigned static ip's for each termimal, even before broadband.

The setup is simple about 16 computers, 1 file server, 1 printserver all connected via a switch. Cannot understand why DHCP was'nt enabled from the server in the first place before broadband. Would there have been any benefits?

Bit confused by your answer though.. how would enabling DHCP on the router benefit? And how would mixed IP states work?

 

[bcastner]

Using the router to assign DHCP addresses is just the simplest way to get such a service. The alternatives are either inelegant (ICS) or more difficult (using a Linux box, or an NT or better server).

Why would you want a mix of fixed and dynamic ports? Because the time always comes when someone needs a port or several ports "forwarded" to provide a service function. This can be a web site, or an FTP server, or a requirement of a piece of software that is needed. Using a static IP simplifies the task of specifying to what address should traffic from the public or WAN side of the router be directed on the private or LAN side.

Best of luck to you.

 

[nell1]

of course.... the fog lifts!

Thanks for the enlightenment!


Regards

Nell1