[j-nsp] proxy arp C vs J

Jonathan Lassoff jof at thejof.com
Tue Feb 7 05:38:50 EST 2012

On Tue, Feb 7, 2012 at 2:23 AM, Alex Arseniev <alex.arseniev at gmail.com> wrote:
> Did you check what MACs are used in 1st, 2nd and 3rd time? Specifically MAC
> OUIs.
> I suspect this is a side effect of having C-J in the same broadcast domain.
> Basically, when J-interface ARPs for a connected host, _AND_ if C has a
> specific route to that host/32, the C will answer with own MAC.

And potentially, depending on the configuration, the Cisco may try and
proxy based on a route learned from the Juniper, creating a loop.

The question I would ask: what is proxy arp used for? why?


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