[j-nsp] Odd issue with ARP in different subnet

[Chris Adams]

Once upon a time, Keegan Holley <keegan.holley at sungard.com> said:
> I don't think the server should arp for 10.1.1.5 from 10.2.2.2.  Devices
> don't usually arp (or answer) for things that aren't in the same subnet.

Can you name anything (other than the EX) that behaves as you describe?
Obviously Linux will send such ARPs (which I believe is proper as the
IPs are both local), and Linux, Cisco IOS, and FreeBSD all respond to
such ARPs.

As I said, reading the ARP RFC would tend to indicate it is expected
behavior; the method for replying to an ARP request says nothing about
checking the source IP address.  If your IP is in the destination field
of a request, you swap destination and source MAC and IP (putting your
MAC in the new source) and send the reply.

-- 
Chris Adams <cmadams at hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.