Why is bond mode 4 configured in /proc/net/bonding/bond1 when I have configured bond mode 1 in /etc/modprobe.conf on Red Hat Enterprise Linux 5?

Solution Unverified - Updated -


  • Why is mode=4 bonding shown in /proc/net/bonding/bond1 when I have configured mode=1 via /etc/modprobe.conf?


  • Red Hat Enterprise Linux 5 (RHEL5)
    • Observed on RHEL5.6 kernel-2.6.18-238.el5, but currently unknown if other versions are also affected.
  • 2 or more bonding devices exist (eg. bond0 and bond1)

    • Only minimal bonding information is configured in /etc/sysconfig/network-scripts/ifcfg-bondX:
    $ cat etc/sysconfig/network-scripts/ifcfg-bond1 
    # Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
    • The bonding mode is configured via /etc/modprobe.conf:
    $ grep bond etc/modprobe.conf 
    alias bond0 bonding
    options bond0 miimon=100 mode=4               <-- bond0 is configurd mode=4
    alias bond1 bonding
    options bond1 miimon=100 mode=1 primary=eth0  <-- bond1 is configured mode=1

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