Network can ping each other but internet connection wont work for other PC's, only mine

[stephenc]

I have 3 PC's (on XP) networked at home called Dad (me), David & Matthew (my kids). The internet connection is installed on mine and David & Matthew connect to the internet through me.

Suddenly they are unable to connect to the internet even though the icons are showing on all 3 PC's for both the LAN and the modem?

We can all access files on eachothers 3 PC's - each of the 3 PC's can ping each other and itself (except for mine unless I disable the firewall). I'm running Norton Internet Security and wonder if that is the problem. It doesn't seem to see the other 2 connected PC's when I go to Personal Firewall | Configure | Networking

I set up the network over a year ago and its been running great; nothing seemed to spark this problem. I'm totally lost - any ideas appreciated

Stephen

 

[DaiShan]

Do you have SP2 installed? You are using ICS I assume? Why not disable Norton and just use the Sp2 firewall? Alternatively you could just buy a router which would make for much easier set up, but if you like it this way give the above a try.

 

[stephenc]

Originally posted by: DaiShan
Do you have SP2 installed? You are using ICS I assume? Why not disable Norton and just use the Sp2 firewall? Alternatively you could just buy a router which would make for much easier set up, but if you like it this way give the above a try.

I dont have Service Pack 2 installed and yes I am using Internet Connection Sharing. But even when I do disable the firewalls (ZP's and Nortons) it still does not work. The baffling thing is that this worked for so long and just stopped?

 

[DaiShan]

How do you have everything connected?

 

[stephenc]

Hi DaiShan

They are all on the same workgroup and the settings -

My PC - LAN Properties|Internet Protocol|General tab|Use the following IP address is selected
IP address 192 168 0 1
Subnet Mask 255 255 255 255
Default Gateway is blank

Use the following DNS server addresses is selected with
Preferred DNS server 192 168 0 1
Alternate DNS server is blank

Davids PC - LAN Properties|Internet Protocol|General tab|Use the following IP address is selected
IP address 192 168 0 23 (when I set it to 1 Windows threw up an error message saying that 'the static IP address that was just configured is already in use on the network. Please reconfigure a different IP address' so I changed it back to 23 which was the original number before I made changes)
Subnet Mask 255 255 255 0
Default Gateway is 192 168 0 1

Use the following DNS server addresses is selected with
Preferred DNS server 192 168 0 1
Alternate DNS server is blank

Matthews PC - I've left it pretty much alone and the settings are -
LAN Properties|Internet Protocol|General tab|Obtain an IP address automatically is selected
Obtain DNS server address automatically is also selected

Hope this helps to explain the settings

Stephen