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): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
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 from http://people.redhat.com/~jbaron/rhel4/
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 release.
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. http://rhn.redhat.com/errata/RHBA-2007-0304.html