Well, this is a new one to me.

Post #324,217 by Andrew Grygus 4/7/10 7:46:12 PM Reply	Well, this is a new one to me. Win 2003 Server - dead motherboard or CPU. Replaced, new drivers, everything working just fine and Activated by Microsoft. Got updates over the Internet and all that. IP address 192.168.200.91 / 255.255.255.0 / 192.168.200.98 Took it to the clients site and plugged it into the network. 192.168.200.91 / 255.255.255.0 / 192.168.200.97 It couldn't ping beyond its own network card. Changed cable, plugged it into the other switch. No tcp/ip to the network, internal or Internet. Changed the ip address - no joy. Tried a PCI network card I had with me. No joy. Brought it back, plugged it into my network, changed the gate back from .97 to .98 - everything worked as advertised.
Post #324,219 by drook 4/7/10 8:11:47 PM Reply	Ooh, I know this one! Computers suck. You're welcome. -- Drew
Post #324,223 by Andrew Grygus 4/7/10 10:10:37 PM Reply	Well, that was interesting. I finally noticed that the gigabit ethernet interface on this fancy MSI motherboard had somehow been assigned a MAC address of 00-00-00-00-00-00. Nothing seemed to care except the client's Linksys switches. My Linksys switches were cool with it. So I assigned it a MAC address and all went well.
Post #324,225 by folkert 4/7/10 11:58:25 PM Reply	Known problem. Believe it or not. Problems in Linux, BSDs and Windows. the all zero's MAC address was probably already existing on the network.
Post #324,229 by Andrew Grygus 4/8/10 2:02:51 AM Reply	Well, I hadn't seen it before . . . . . but I'll sure be watching for it in the future. I don't think it was another zero-MAC that stopped us. We pulled all connections from one of the 16-port switches, power cycled it and plugged in only my notebook, the server in question, and the Internet router. Still wouldn't work, so I think that model Linksys simply refuses to handle zero-MACS.
Post #324,237 by folkert 4/8/10 9:17:29 AM Reply	Some older Cisco, Linksys and... off brand routers and switches don't handle a lot of odd but allowed things. I ran into this on some managed D-Link gigabit switches. It was driving me nuts as the machine in question was the Business owners custom made machine. I ended up having to disable the NIC on the motherboard and put in a new NIC. It would not take an assignment of a MAC address. When I saw this thread... and read the first message, my first thought was all zero MAC addr. Its a bugger to troubleshoot. You almost have to sniff the connection, but anything you put in between the computer and the switch fixes or completely masks it, typically.

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