Bug 629239

Summary: [4u8] Bonding in ALB mode sends ARP in loop [rhel-4.8.z]
Product: Red Hat Enterprise Linux 4 Reporter: RHEL Program Management <pm-rhel>
Component: kernelAssignee: Don Howard <dhoward>
Status: CLOSED ERRATA QA Contact: Liang Zheng <lzheng>
Severity: high Docs Contact:
Priority: urgent    
Version: 4.8CC: agospoda, dhoward, fleitner, jwest, kzhang, lzheng, pm-eus, vgoyal
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
When two systems using bonding devices in the adaptive load balancing (ALB) mode communicated with each other, an endless loop of ARP replies started between these two systems due to a faulty MAC address update. With this update, the MAC address update no longer creates unneeded ARP replies.
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-10-19 18:48:38 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 610236    
Bug Blocks:    

Description RHEL Program Management 2010-09-01 12:04:02 UTC
This bug has been copied from bug #610236 and has been proposed
to be backported to 4.8 z-stream (EUS).

Comment 3 Don Howard 2010-09-16 16:40:52 UTC
A patch for this issue has been included in kernel 2.6.9-89.0.30.

Comment 5 Liang Zheng 2010-10-15 09:06:22 UTC
Test in kernel 2.6.9-89, Steps to Reproduce:
 1. config two systems both running bonding in ALB mode 
 2. System A ping system B,the ARP being sent each 2 seconds between them

[root@hp-dl320g5-01 mnt]# tcpdump -v arp
tcpdump: WARNING: eth0: no IPv4 address assigned
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
03:49:49.056184 arp reply hp-dl320g5-01.rhts.eng.bos.redhat.com is-at 00:18:71:8c:16:22
03:49:49.056384 arp reply hp-dl320g5-01.rhts.eng.bos.redhat.com is-at 00:18:71:8c:16:22
03:49:53.156023 arp reply hp-dl320g5-01.rhts.eng.bos.redhat.com is-at 00:18:71:8c:16:22
03:49:53.156026 arp reply hp-dl320g5-01.rhts.eng.bos.redhat.com is-at 00:18:71:8c:16:22

Test in kernel 2.6.9-89.31.1:
There are no unneeded ARP packets.

[root@dell-pem605-01 ~]# tcpdump -v arp
tcpdump: WARNING: eth0: no IPv4 address assigned
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes

0 packets captured

Comment 7 errata-xmlrpc 2010-10-19 18:48:38 UTC
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 therefore 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/RHSA-2010-0779.html

Comment 8 Martin Prpič 2010-10-21 12:25:44 UTC
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
When two systems using bonding devices in the adaptive load balancing (ALB) mode communicated with each other, an endless loop of ARP replies started between these two systems due to a faulty MAC address update. With this update, the MAC address update no longer creates unneeded ARP replies.