Scan IP relocate/failover其它段后不能ping通过

    或手动集群重启单个节点srvctl relocate scan_listener后。群集网络段ping IP,VIP。SCAN IP正常。其他段ping SCAN IP 不通。其原因是，该路由ARP表中没有的新的服务员SCAN IP。需要手动更新。

 /sbin/arping -U -c 3 -I <public NIC for vip> <vip ip address> 

   my oracle support说明例如以下：

Bug 13440962  Different subnet failed to connect to vip after restart vip

 This note gives a brief overview of bug 13440962. 
 The content was last updated on: 01-FEB-2012
 Click here for details of each of the sections below.

Affects:

Product (Component)	Oracle Server (PCW)
Range of versions believed to be affected	Versions >= 11.2.0.3 but BELOW 12.1
Versions confirmed as being affected	11.2.0.3
Platforms affected	Generic (all / most platforms affected)

 It is believed to be a regression in default behaviour thus:
   Regression introduced in 11.2.0.3

Fixed:

This issue is fixed in

12.1 (Future Release)

Description

This is a regression fix for problem introduced by patch 11069846. 
The change in this patch (patch 13440962) fixes a problem with 4 extra 
bytes in the GARP message and removes an extra unicast GARP packet to 
the router.
 
Rediscovery Notes:
 After upgrading to 11.2.0.3, after vip failover, the ip address is 
 not pingable from a different subnet on Linux. 
 (This problem is seen only on Linux)
 
Workaround
 After vip failover, run command 
   /sbin/arping -U -c 3 -I <public NIC for vip> <vip ip address> 
 to update the ARP table of router.