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Configuring a computer for ICS from an existing peer to peer network

I have a peer-to-peer network set up with about 12 computers.  Each computer currently has a static IP address and we connect to the Internet via a DSL modem connected directly to our hub.  The computers are running Windows 2000 Pro or XP Pro and have Norton Internet Security (including anti-virus).  We are switching to a new DSL provider with a single static IP.  I have installed a second ethernet card in a system with 2000Pro for use as the ICS host (referred to as file server) and reconfigured the card to connect to the new DSL modem.  I can access the Internet and email from the file server.  I’ve configured this computer for Internet sharing including configuring the default ports.  I’ve taken 2 of the other computers, reconfigured the TCP/IP for automatic IP addresses, and can access the file server.  I’ve reconfigured Norton to allow access for the new IP address ranges. I’ve even moved the 3 computers for this test to a separate hub to isolate them from the existing network.

Problem:

I cannot access the Internet from the other computers.  From these computers, I can ping (get a response from a ping) both cards on the file server but cannot ping the gateway or the DNS servers as I can from the file server.  I’ve disabled the Norton temporarily but it doesn’t help and I don’t want to run my file server without a firewall.

Questions:

Even though I’ve disabled Norton’s on all systems, is there something that could be running in the background that is still blocking the connection?
Should I completely remove all network connections from all machines and start over as if it were a new network since the original network was configured as peer-to-peer?
Is there something else I missed?
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DWG57
Asked:
DWG57
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1 Solution
 
Pete LongConsultantCommented:
you dont say what OS the clients are?

To Troubleshoot ICS
http://www.practicallynetworked.com/sharing/ics/ics_troubleshoot.htm
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Pete LongConsultantCommented:
if there are any XP machines in the equation ensure ICF is disabled on them

Windows XP Built in Firewall (ICF)

The (Internet Connection Firewall) that ships with XP while not a bad thing us usually the cause of most home networking "woes"

You should get a reliable Firewall if you spend any time online

***Not Free***
Zone Alarm http://www.zonelabs.com/store/content/home.jsp
Norton http://www.symantec.com/sabu/nis/npf/
Black Ice http://blackice.iss.net/

***To Disable Windows XP Firewall***

1.  Open Network Connections (Click Start, click Control Panel, and then double click Network Connections.)
 
2.  Click the Dial up, LAN or High–Speed Internet connection that you want to protect, and then, under Network Tasks, click Change settings of this connection.
 
3.  On the Advanced tab, under Internet Connection Firewall, select the following:  Clear the Protect my computer and network by limiting or preventing access to this computer from the Internet check box. This disables the firewall, your computer and network are then vulnerable to intrusions.
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DWG57Author Commented:
The ICS was set up on a system running 2000 Pro and of the 2 clients, one was 2000 Pro and one was XP Pro
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Pete LongConsultantCommented:
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Pete LongConsultantCommented:
your call?
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