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I have this problem that when I boot Knoppix on my Windows box, it screws up the internet connection somehow, so Windows cannot get an IP when I reboot back to XP. I use Verizon FIOS. Normally I have to fix this by calling Verizon and having them reset the network interface.
I assume that Knoppix is doing something wierd with ARP or something, I don't know, I am not a network engineer.
I have read some random stuff on the internets that things like this can get caused by the OS giving out a fake Mac address or that there is some other mac-address-related conflict going on.
Anybody know what could be wrong and how to fix it?
Tyler Durden
Posted 2012-10-05T20:19:45.847
Reputation: 4 710
Complete guess, hence the commit. But it may be that the machine is grabbing an address from DHCP and that conflicts when you go back into windows, and it is trying to use an old address. If you release and renew with ipconfig it may fix it. – None – 2012-10-05T20:28:33.227
No, no. No release/renew fixes it. This is way more hardcore problem than doing some simple reset. I mean you can go unplugging everything, turning everything off, releasing, renewing, turning auto this on and off, nothing fixes it. It's like it gets hardwired to some IP on the Knoppix and won't change. Not only that, but if you turn off DHCP and hard code the Knoppix IP (which works in that environment) in the Windows TCP advanced settings, it still doesn't work. I think it is because Knoppix changes the mac address and then FIOS refuses to talk to the XP mac address. – None – 2012-10-05T20:32:31.743
That is a mystery. This may be a better question for ServerFault though. – None – 2012-10-05T20:34:41.743
http://serverfault.com/ – None – 2012-10-05T20:35:19.167
Just to clarify, when you try to renew you get an error (I forgot exactly what it was) but it amounts to an error saying that Windows is unable to located the DHCP server, even though auto detect is on. Because of this I assume ARP is not working, but I have to admit I am fuzzy on the details of how a Windows box goes about getting its IP address. – None – 2012-10-05T21:18:35.263
This probably isn't your issue, but I feel worthy of mention that I had Backtrack turn off the hardware wifi switch before on a laptop. Even though I had a physical switch, there was another hidden switch that linux toyed with that messed things up for me in windows. – cloneman – 2012-10-06T10:05:58.583
One thing to try is running wireshark and watching what happens when you connect the ethernet cable (after booting each OS disconnected). If weird ARP things are happening, you at least will see weird ARP packets, some of which may be intelligible enough to give hints. This requires that you have somewhere you can read wireshark from with knoppix (thumb drive perhaps?) The mac address bit might be true, and you can compare the actual mac addresses in the packets this way as well. – Gus – 2012-10-24T22:03:06.687