I noticed the same behavior about a year ago. It is actually arp'ing for
every address in the DHCP address pool. Not the interface's subnet.
At that time, no one had any explanations in the comp.cisco Usenet group. I
also believe this behavior started with the CBOS 2.3 upgrade. I could not
confirm this.
This was driving me crazy. Little things like this bother me. I reduced the
pool size to the exact number of devices attached and I believe the arp'ing
behavior stops.
I could not find a lot of info on CBOS. I hope there is a CBOS guru out
there who can satisfy my curiosity.
-----Original Message-----
From: Curtis Call [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 06, 2000 9:00 AM
To: [EMAIL PROTECTED]
Subject: Strange Cisco 675 ARP behavior
I've been messing around with a sniffer program on my home network and I've
noticed some unexpected behavior from my Cisco 675 router. When I scan for
ARP queries I can see that my router is continually scanning through my
entire subnet doing an ARP query for each address one by one. Is this
normal router behavior? I suspect it has something to do with the fact that
it is configured to be a DHCP server, is it normal for Cisco routers to
check for used IP addresses? Is this standard CBOS behavior? Any ideas
would be appreciated, it just makes me really curious.
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