arp issues...but WHY

J.D. Bronson jbronson at
Tue May 4 05:30:24 PDT 2004

I have a FreeBSD 5.2.1 machine that has dual NICs.
I would expect the following behavior if I placed both NICs
on the same subnet ( and for example)...

But in this case they are totally unique:

NIC #1 -
NIC #2 -
Default gateway:

I am using a single SWITCH for all of my connections.

most of my LAN is on the '10' block, but I have a few machines and 1 router
that are on the '192' block.

When I telnet into the freebsd machine from the '' to the '10' block
I see ARP comments on the console that I dont understand:

arp: is on fxp0 but got reply from 00:10:7b:80:04:40 on fxp1

How is this possible? - the laptop has NO IP on the 192 block at all.
I understand how to shut up these errors using 'sysctl' - but I wanted to 
know why I am seeing them in the first place?


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