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.
I have seen this myself many times and I suggest to disable proxy-arp on C
to get rid of this behavior.
HTH
Thanks
Alex
----- Original Message -----
From: "biwa net" <biwa...@gmail.com>
To: <juniper-nsp@puck.nether.net>
Sent: Monday, February 06, 2012 7:57 PM
Subject: Re: [j-nsp] proxy arp C vs J
Forgot to add we are running MX80 on Junos 11.2
On 6 February 2012 19:56, biwa net <biwa...@gmail.com> wrote:
Hi Guys
We are experiencing some issues in one of our client sites,
Basically we migrate from a Cisco to a Juniper MX80, and since there has
been some issues, mainly we are seeing IP addresses being shared by 2-3
mac address, to be precise , mac address being rewritten , ie: one IP is
being seen on the Juniper owned by 3 different mac address within one
hour
( the 1st mac address is being re-writen by the 2nd one and then 2nd by
the 3rd mac).
This is causing a lot of users not having any kind of internet
connectivity.When we rollback to the Cisco device , this issue does not
occur.
After investigation we can safely eliminates the DHCP server being the
cause of issue (, also proved when Cisco is roll back in the topology),
The config of the Cisco is fairly simple and is almost 99.99% than the
one
being copied over to the Juniper.
One thing we notice is that both Cisco and Juniper has proxy-arp
configured on some of the interface, and we are planning in our next
maintenance to disable it.
my question is: is the proxy-arp behavior in Juniper slightly different
than the Cisco ?
thanks for your inputs
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