I'm having six PCs connected by switch. I reinstalled systems, only thing that changed is that pc with shared network connection has Windows 7 now.
With old setup: Server: IP:192.168.0.1 Subnet Mask:255.255.255.0 Default Gateway:192.168.0.1 DNS Server:192.168.0.1 and Client: IP:192.168.0.x Subnet Mask:255.255.255.0 Default Gateway:192.168.0.1 DNS Server:192.168.0.1 Internet sharing worked perfectly.
Now the problem is, Windows 7 doesn't set default 192.168.0.1 for server, it sets 192.168.137.1. If I change 0 by 137, weird thing happen'. I can ping clients, but no reply comes from server. I can't share internet like this. While with 0 everything in lan works fine, with 137 server simply doesn't reply.
More aboutping server
Change the IP address of the server.
Or disable the Server's Firewall. You can also allow a ping response. Depending on how the firewall is configured, it may intentially not response to pings.
It works. I shared connection and reconfigured my firewall.