Can't ping beyond the inward facing LAN card
Posted on 2004-11-15
I have been asked to solve a network problem with a Windows 2000 Server.
The outward facing Internet access is via a USB attached DirectPC network connection, and provides internet connection sharing for the lan card.
The default gateway is ff.ff.0.0 because the third tuple is different for the IP Addr and DefGw.
The inward facing lan card is made by 3Com, it's IP address is 192.168.0.1, and is connected to a hub.
The windows network icon in the tray indicates the presence of inward and outward facing network connections.
The lights on the hub correspond to the server and the wifi Access Point.
The wifi AP is made by LinkSys, it's IP address is 192.168.0.2, and is connected to the hub. There is no encryption.
There are 2 notebook clients with WiFi adapters, either built in or pccard. Their IP addresses are 0.90 and 0.91.
What I can do from the server:
Ping the loopback adapter.
Ping the outward facing nic.
Ping the inward facing nic.
The server can resolve DNS and surf the internet.
The clients can ping and manage the AP fine.
What I can't do from the server:
I can't ping the AP or anything behind it.
The clients cannot ping the inward facing lan card in the server.
The clients cannot resolve DNS (surprise, surprise).
What I've done so far:
Confirmed the IP addresses are assigned correctly.
Confirmed that static addresses are used, even for the outward facing USB adapter to DirecPC.
Scratched my head and effectively walked in circles many times, to get the above information.
I got this all to work. But then I noticed that the ip address of the servers inward facing lan card was 0.1 instead of 1.1. So I changed it to 1.1, to match the rest of the network. It was after this, I was suddenly unable to get out of the servers' lan card.
Note: This used to work. When I arrived at the site, the wireless network of computers was not working. But I identified and corrected 4 problems, and got things to work swimmingly. My customer was pleased and impressed, since a reputable someone else had already taken a stab at this and declared the problem unsolvable.