Virtual IP on Linux Bonded interface requires ''arping'' to re-enable access from remote hosts after transparent interface failure.
Article ID: 100001869
Updated On:
Description
Error Message
There are no error message reported.
Cause
A Virtual IP on a Linux bonded interface requires 'arping' to broadcast the new Mac Address after a transparent interface failure within the Bonded interfaces. Note that the interface failure within the boned interfaces does not affect the Base IP, it only affects the Virtual IP. This behavior is not a bug, rather it is the designed behavior or limitation of Bonded Interface with Virtual IP.
VCS provides high availability for Virtual IP with the 'IP' and 'IPMultiNICB' type resources, and VCS is not affected by this behavior neither contributing to this issue. The only issue is that the remote hosts are unable to access the Virtual IP until after the new MAC Address is broadcasted by the 'arping'.
Resolution
The address this issue perform periodic 'arping' for the Virtual IP address in a crontab.
This behavior of Linux Bonded interface with Virtual IP address and the resolution is described on Redhat Knowledge base site (login requires) at :
Issue/Introduction
Virtual IP on Linux Bonded interface requires ''arping'' to re-enable access from remote hosts after transparent interface failure.
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