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Problem with WinXP ICS

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13 replies

by r. a. caluste

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I have the ff setup:

1 multihomed WinXP PC connected to the internet via Cable Modem, and to the lan via Switch.
Used the network setup wizard to configure Internet Connection Sharing.

When I ping my default gateway (public interface), I could not get a response (request timed out). When I ping a pc in my LAN (private interface), i get a response ( < 1 ms). When I disable my private interface (the connection to my private lan), I am able to ping my internet gateway. As soon as I enable my private interface, the ping status to my public gateway foes from 15 ms to 1000 ms to 2000 ms to request timed out.

Before it was working properly, now, I cannot make it work. I have reset my winsock (using winsockfix, netsh int ip reset x.log).

Netdiag returns error when trying to ping default gateway.

Any ideas?

13 replies

by rindi1

The default gateway on the pc which is sharing the internet connection should not be set by you (You are probably using dhcp to get an ip address from your cablemodem, you'll get the gateway from there). The connected PCs should have your PCs IP address as gateway address. That way it should work.

by r. a. caluste

Thank you for your answer.

I have not set any configuration manually.

The public interface configuration was obtained dynamically using the ISP's DHCP.

The private interface configuration was obtained automatically using the network setup wizard ( when using ICS on WinXP, the private interface is automatically assigned the IP address 192.168.0.1, netmask 255.255.255.0)

From the PC sharing the internet's console, I am able to ping the workstations connected in the LAN. However, I cannot ping my ISP's gateway. If I disable my private interface, I am able to ping my ISP's gateway. Why is that?

by mikex

Buy a router and connect them in the following order:

Cable modem=>Router=>Switch=PC's

by r. a. caluste

I was hoping for a solution using Windows XP and ICS. I have used this before and is puzzled as to what went wrong with my present configuration.

Thanks.

by candi_sd

1. Remove ICS
- You should not need ICS to access internal and external network at the same time. I understand that you are trying to share the connection out, but this is just to troubleshoot the connection first. Does this solve your problem? If not see step 2.
2. Ping the internal and external gateway. If you do not have an internal gateway then try to ping a another computer in your subnet. If you are able to ping internally and externally then you may have a bad network cable or something with the hardware, but your configuration will be fine. It doesn't sound like this is the problem you are having. If you are unable to ping both gateways then it is a configuration problem see step 3.
3. Verify IP address you are pinging are in your subnet. Make sure the gateway and the device you are trying to ping are in your subnet. If you need help with this you can post your configuration and I can help you verify it. If your network configuration is correct then check out step 4.
4. Remove TCP/IP stack and reinstall then uninstall and reinstall new device drivers for your network adapters.
If none of these steps resolve this issue then post your results and we can go from there.

by rindi1

Can you open a command prompt on your gateway pc and execute "ipconfig /all" (without the quotes), then reject my answer and paste the result you get here?

Thanks.

by mikex

In order for you to get a working config with the following:

cable modem=>Switch=>PC's

you need to have on the ICS PC TWO network cards

the first one needs to be associated with your cable modem to receive the Internet (your cable ISP is controling your access with your netCard MAC address) - so it's dedicated one

Open the network connections and Bridge the 1 netCard with the second one and plug the NetCable from the second card into the switch => GO&Surf

by dustyd

Another way to resolve:
Using static IP addressing, only 1 NIC is required. DSL modem/Router/Lan PC's.
Make sure that each PC's IP address is in the same range as your router.
Routers by default are mostly 192.168.1.1 When you enable ICS, Windows changes your IP to 192.168.0.1 Enable NAT, disable DHCP on the router. Your router still hides local LAN behind its public IP address.
Ensure unique PC names, using identical workgroup name. You should have no problems with internet connection and sharing files/printers.

by dustyd

To clarify, there should be no ICS connections on your PC. The only connection listed should be your NIC, do dial-up connections required, no bridging.

by choppit

Try temporarily disabling any software firewalls and see if this makes a difference. In case you're not aware, XP SP2 installs and enables a basic software firewall by default.

by laquangthong

Get a router. It's cheap, you can get one at 10 -> 20 bucks now. With the router, you don't have to keep the gateway computer on for other computer to use the internet.

It's possible to stay with your current configuration too
- Gateway computer need 2 NIC, one connect to the cable modem, the other to the switch.
- Make sure the gateway computer is online, then run the ICS Wizard.
- Run the ICS Wizard on the other computer.
- Everything should be fine at this point. If they don't, manually set the ip address of those computer to 192.168.0.x (x = 2-> 254) and subnet to 255.255.255.0 . (you should be able to ping some internet website from any computer after doing this) You might have to ask your ISP for the ip address of the DNS to put it in thou.

Hope this help,

by neil_essex

If you can transfer files, your network cards, cables and hub are okay.
What protocols are you using? XP defaults to TCP/IP.

If you only have TCP/IP and files are getting through, then your IP addressing is working.

If you have other protocols running as well as TCP/IP (such as NetBEUI and/or IPX/SPX then these may be carrying traffic, and IP address may/may not be okay.

If you have a software firewall running it may be blocking PING packets. Check the firewall log to see what it is blocking.

Disable all protocols except TCP/IP
Configure TCP/IP to get IP addresses automatically.
Open a command line ("MS-DOS") window on each computer and run IPCONFIG. This will display the IP address of the local computer.
On each computer run PING, using first the IP address of the other computer then the other computer's name. I'd expect that the packets would reach the other end OK and the results will be displayed at the sending end. You'll never expect to see a display at the receiving end when pinged.

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