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From "Kelceydamage@bbits" <>
Subject Re: Virtual Routers and ARP handling
Date Thu, 09 Aug 2012 15:54:18 GMT
Not often at all. I simply set the unsolicited requests to 30s to prove out. default is os
default centos 6.2.

All the IPs share the same MAC and the gateway should not be "moving".

Again, no issues from a centos guest using it directly as a gateway. Issues only when the
VR is using it as a gateway.

Sent from my iPhone

On Aug 9, 2012, at 1:10 AM, Venkata SwamyBabu Budumuru <>

> First question I have is : how often your gateway cluster results in unsolicited ARP
broadcast i.e. how quickly the gateway is moving ?
> -----Original Message-----
> From: Kelcey Damage [] 
> Sent: Thursday, August 09, 2012 12:15 PM
> To:
> Subject: Virtual Routers and ARP handling
> Not sure if this is a bug, but I have found in testing the Virtual Routers dump their
arp cash almost every 5-10 seconds. 
> This makes them loose connectivity if they live behind a perimeter firewall cluster running
floating IPs for gateway addresses (for example: Conntrack, CRM/Pacemaker, VRRP).  Any vm
using a shared network connection to the floating gateway has no issues, but isolated networks
requiring the VR to be an initial gateway will loose connectivity as the Debian VR aggressively
flushes its ARP cache. 
> You can even watch connections stop then start when the gateway cluster sends its unsolicited
ARP broadcasts, and then within a few seconds, stop again.
> Can we look into this?
> My setup is below
> Gateway cluster running: 
> 4 floating IPs on eth4 (Cloud public network gateways, 1 per zone, all VRs point to these)
> 36 floating IPs on eth0 (SNAT addresses into cloud)
> 2 floating IPs on eth1 (Management Gateways) HB on eth2 (Cluster heartbeat)
> *No issues connecting VMs directly to the gateway cluster with shared networks(VLAN)
> *connection issues when using isolated networks routed through VR to gateway cluster
> -kelcey
> Sent from my iPhone

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