My internet/lan network was working fine till 3 days ago and refuses to work now. internal lan network between 2 pcs. the one connected to the internet connection is working with airtel internet connection just fine. the other one is connected through a hub and the internet refuses to work!
Can you ping the pc with the internet connectivity from the other PC ? .Since you said that the network refuses to work, i assume you can't ping one from the other..... In that case, check the cables, if the cables are fine, try using system restore if restore points are available (Assuming you're on windows) If it doesn't help either, get the switch/hub checked ....if it's faulty, simply get a Crossover cable and you won't need a hub. check this page : ethernet crossover cable diagram and functionality