From: Dan_Price@xxxxxxxxxxxxx
Date: Wed Oct 04 2000 - 02:23:07 GMT-3
Proxy ARP...
It is my understanding that proxy arp, enabled by default, allows a Cisco Route
r
(be it MSFC, as in this case or 2502)
to respond with its MAC address when presented with an ARP request for an IP
address that the router has in its route table.
HOST A ----ENET ----- ROUTER A -------HDLC T1 ------ROUTER B -------ENET ------
HOST B
Host A (misconfigured or non supported subnet mask) arps on the Router A ENET
for Host B
without Proxy Arp this goes nowhere, thanks to Proxy ARP the Router A steps in
and provides HOST A with its MAC to reach HOST B
OK..??..
So now, different routed situation
HOST A ----- > HSRP DEF GW ------> MSFC RUNNING 12.07XE2 (times two) ------>
HDLC HSSI (x3) --------> 7206VXR (12.07T)
On either MSFC (redundant situation) we are seeing 5,000,000 proxy arps for
about 10 weeks uptime
ARP statistics:
Rcvd: 17351184 requests, 72877 replies, 81 reverse, 0 other
Sent: 118076 requests, 5557578 replies (5552437 proxy), 0 reverse
No misconfigured hosts that we can tell at this time.
Wondering if HSRP plays into this at all, sending the Virtual Mac for the DEF-G
W
Standby IP??. Same situation regardless of code, RSM or MSFC.
Anyone noticed this one before??
Dan Price
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