Bug 828524 - With multiple bond interfaces, only the first arp_interval and arp_ip_target "options" line is used.
With multiple bond interfaces, only the first arp_interval and arp_ip_target ...
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: module-init-tools (Show other bugs)
Unspecified Linux
unspecified Severity high
: rc
: ---
Assigned To: David Shea
Depends On:
Blocks: 921048 928849
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Reported: 2012-06-04 16:31 EDT by Dylan Gross
Modified: 2013-06-13 15:36 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-06-13 15:36:43 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Dylan Gross 2012-06-04 16:31:04 EDT
Description of problem:

When more than one bonded network interface exists, and an "options" line exists for each in /etc/modprobe.conf, both bonded interfaces will be set with the options (arp_ip_target, arp_interval) from the first one.

Version-Release number of selected component (if applicable):

Reproduced on:  
   kernel-2.6.18-274.12.1.el5 with initscripts-8.45.42-1.el5
   kernel-  with initscripts-8.45.42-1.el5

How reproducible:

Setup a server with two separate bonded interfaces (bond0, bond1), and set an options line in /etc/modprobe.conf for each with different arp_interval and arp_ip_target options.

Steps to Reproduce:
1.  Setup two bonded interfaces.

2.  Use the following in /etc/modprobe.conf...

    alias bond0 bonding
    options bond0 arp_interval=1000 arp_ip_target=
    alias bond1 bonding
    options bond1 arp_interval=333 arp_ip_target=

3.  # cat /proc/net/bonding/bond0 
    # cat /proc/net/bonding/bond1

Actual results:
    "ARP Polling Interval (ms):  1000"  for both bond0 & bond1
    "ARP IP target/s (n.n.n.n for):"  for both bond0 & bond1

Expected results:

    "ARP Polling Interval (ms):  1000"  for bond0
    "ARP IP target/s (n.n.n.n for):"  for bond0

     and ....

    "ARP Polling Interval (ms):  333"  for bond1
    "ARP IP target/s (n.n.n.n for):"  for bond1

Additional info:
    We're not entirely sure of the impact but we came across this when investigating some flapping of the interface for which the setting are not taking effect and though it may have been the cause.
Comment 1 Lukáš Nykrýn 2012-06-05 10:34:46 EDT
This should be probably addressed to module-init-tools.
Comment 2 David Cantrell 2013-03-20 09:19:49 EDT
Any additional information on this one?  The impact or perhaps cause via something else?
Comment 3 Dylan Gross 2013-03-20 10:03:35 EDT
After pointing customer to the "Important" note in the Deployment Guide, which suggests using the BONDING_OPTS in the ifcfg file instead of modprobe.conf, the correct behaviour was acheived.  

Comment 9 David Shea 2013-06-13 15:36:43 EDT
Since the same kernel module is used for both bonding interfaces, modprobe.conf cannot be used to set different options for the two interfaces. Setting the bonding options per the method linked in comment 3 will correctly apply the options to the bonding interface rather than the bonding module.

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