Troubleshooting ICS between Windows7, Windows XP , Linux etc

Internet Connection Sharing has always been a pain in the a$$ for me. There has been numerous hours which went in vain trying to connect between all combinations involving Windows7, Windows XP and Linux. Though I got them connected once or twice, I could not decode the exact methodology. Each time trying to use ICS ended in broken keyboards, fists etc. After many attempts I at last found out the reason the exact modus operandi to use ICS.
I am not going into a step by step instruction of enabling ICS, which are alredy given here. I will just help you out from the most common issues faced.

Here I am explaining the scenario where, your internet is connected through the wired LAN, and you wan't share that using your WiFi. Your wired connection is in Windows [XP, Vista, 7 etc] and you want to share it with any other OS.

• Here, first you have to create a WiFi network from the host. This should not be a problem, and if at all it is, try to use [Open, WEP] authentication, instead WPA2 etc because these may not be compatible over all OSes.
• There may be a scenario where the Ad-Hoc network is created, but internet is not being shared. This can be checked by these steps.

1. Goto the client PC, and goto the command prompt and type ipconfig. You will get the ip of the PC, note that.
2. Now create a shared folder in this PC.
3. Now goto the host and type \\ip-of-client. Now if you can see the shared folder, you network is established. Only internet is not shared.

• Now to get the internet shared, you have to the following. Goto the properties of the wired connection, [the connection from which you get internet], and goto the sharing tab. There you have to enable internet sharing.
• Sometimes,, this sharing itself would not be available/present. This maybe because, the sharing is enabled in any other connection. [Only one of the connection's sharing can be enabled]. So, disable this connection first and then enable sharing in the other connection.
• Now reconnect the WiFi, this should get the internet working.
• In, Windows7, you may have to choose which connections internet need to shared. There you have to choose the wired LAN [or the network which gives internet].

I already wasted a lot of hours trying to get ICS working, and there is a general notion that internet sharing through ICS is inconsistent. The fact which I inferred is that documentation and wizards on this topic is very scarce. If you have any doubts please post in the comments section and I would be more than happy to help.
-codevalley