[NCLUG] Perplexing wireless issue - Voodoo accepted

[Paul Hummer]

On Sun, 07 Feb 2010 19:30:48 -0700
Stephen Warren <swarren at wwwdotorg.org> wrote:

> Paul Hummer wrote:
> >...
> >   Here's where it gets weirder.  I changed the MAC address of wireless
> > interface on the WRT54GL, because it seemed MAC related.  No joy.  That was
> > all last night.  I started writing this email this afternoon, and thought
> > "What if I change my laptop wireless interface NIC?"  So I did it.
> > NetworkManager gets an IP.  About 5 seconds later, NetworkManager then
> > loses the connection.  If I change my MAC again, it connects, then loses
> > the connection shortly after.
> 
> Something else on your network is running a DHCP server, even something
> on your laptop you set up for testing? Are you running any VMs on the
> laptop; is the VM system running DHCP and it's leaking to your external
> NIC somehow?

Is there any way I could find out if something else is serving DHCP?  I shut
down everything on the wireless that I know of, but I might have forgotten
something.

> 
> Or, perhaps your laptop has N copies of dhcpcd/similar running that are
> fighting?

I would think a reboot would kill that.  I only see one copy of dhclient
running right now.  I also don't see the vbox service running (which is what I
use for my virtualization stuff), so it can't be that either.

> 
> Other than than, I think wireshark + verbose logging on the DHCP client
> are about all I could suggest.

Should I make sure any specific settings are on/off?  I tried the wireshark
thing and I just couldn't get anything definitive when I was looking.

Cheers,
Paul
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