Red Hat Bugzilla – Bug 218664
[RHEL4] Problem using netdump when multiple routers are involved
Last modified: 2007-11-16 20:14:54 EST
Description of problem:
When using netpoll to do either netconsole or netdump, ARP requests are handled
by the function arp_reply(). Currently, arp_reply always replies to the MAC
address that it was given when it starts. However, if you have multiple routers
that can ARP request you, you might respond to the wrong router; in which case
the other router will eventually drop you from it's ARP cache and stop
delivering packets to you. The attached patch fixes this by always replying to
the router that asked, not the one that is hard-coded.
I don't have the network setup to test this, but it was successfully tested by
the customer that reported it.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Created attachment 142967 [details]
Fix for netpoll arp_reply to the router that asked
what are the test results of this patch? I know we wrote this and it needed some
fix ups, but has the customer tried it in their network yet?
committed in stream U5 build 42.31. A test kernel with this patch is available
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
QE ack for RHEL4.5.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.