How to fix Internet Sharing with Win XP

This is my last article for 2009. I have two computers connected to a router, they all shared same internet connection. One day, router blocked the internet without no warning.

I tried to re-setup ICS Wizard in router and main network adapters in router and client computers, Network Connections > right-clicked Local Area Connection, Properties > Internet Protocol > Properties, type the IP Address, Subnet Mask, Default Gateway. Note: only router has empty Default Gateway

FYI, Local Area Connection use local IP address, its Subnet Mask and local Default Gateway. You can use range 192.168.0.1 – 192.168.0.255 or 192.168.1.1-192.168.1.255.

Microsoft Documentations tells you to use range 192.168.0.1 – 192.168.0.255, because ICS Wizard likely to setup that range.
You can read how to setup ICS or in short term, Internet Sharing here. My experience below could be used for both range of IPs

I won’t explain ICS Wizard again, because that isn’t subject of the article. This article for you who have problems with Internet Sharing, which you did setup and did work well before problem arise.

Re-setup didn’t help. I concluded it must be something unrelated with Network that may blocked the internet sharing. That’s virus or worm. I scanned all three computers using Avira AntiVir Personal. No virus or worm in scan results. Then I realized the Avira was going to be expired. I removed Avira from all computers. I did scan the computers, no need to worry about virus and worm. Of course, before you remove Avira, you should check quarantine folder, because some anti-virus could release them sometimes. Delete whatever in quarantine folder

I also did reset IE, Internet Explorer controlled Internet Online/Offline behavior when no setup proxy in Firefox, Chrome, Opera or other browsers, even Yahoo Messenger affected by IE. Go to Tools on Menu bar > Internet Options > Advanced > Reset Internet Explorer Settings > Reset, follow instructions on the screen

Next, I ran a set of commands to clear and flush WinSock (run this on router and clients),
netsh winsock reset
netsh int ip reset reset.log
netsh winsock reset catalog
ipconfig /flushdns
ipconfig /renew

Press enter after each command.

Reboot the computers and see if that makes a difference if not then it could either be a corrupt registry file or firewall problem (If that’s registry, i suggest to re-install Win XP. If that’s firewall, disable WinXP firewall)

After reboot, i did setup router and client computers IP Addresses, Subnet Masks and Default Gateways. Default Gateway IPs in clients must use Router IP Address (router doesn’t have Default Gateway)

Now, last but important setup DNS to router IP Address
After everything okay, you can install Avira back again