[nSLUG] MAC-address/router question

Mike Spencer mspencer at tallships.ca
Fri Dec 9 00:11:34 AST 2005

Just noticed:

My router's web-based admin interface says its MAC address is

I have a laptop talking to it by wireless.  iwconfig on that machine
says "Access Point: xx:xx:xx:xx:xx:20".  If I start tcpdump, I see "arp
reply <router-name is-at xx:xx:xx:xx:xx:20.

The x's all match correctly.  The router isn't connected to the
outside net, just to 1 to 4 local machines and a printer.  Everything
seems to be working fine. (And out here in the boonies, it's extremely
unlikely that anyone is piggy-backing on my wireless and messing with
it.) All Slack 10.1 and 2.4 kernel.

What explains the off-by-one MAC address discrepancy?  I though MAC
addresses were fixed.

- Mike

Michael Spencer                  Nova Scotia, Canada       .~. 
mspencer at tallships.ca                                     /( )\
http://home.tallships.ca/mspencer/                        ^^-^^


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