Proxy ARP can be useful while sorting out a broken (misconfigured) network, but can also cause you a lot of grief. If the network is configured correctly, it's just a hindrance. Most definitely turn it off, then fix any routing issues it was masking.
I see someone mentioned turning off gratuitous arps, but I'd only do that if really necessary, as its very useful for forcing a refresh of an entry e.g. E-Series cable customers Cheers, Gordon -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of biwa net Sent: Tuesday, 7 February 2012 5:57 a.m. To: [email protected] Subject: [j-nsp] proxy arp C vs J 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 _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
