Virtualization guide incorrectly states that enabling IP forwarding (net.ipv4.ip_forward = 1) is required for shared bridges

Solution Verified - Updated -

Issue

  • Should IP forwarding be enabled for shared bridges?
  • The Virtualization guide states that enabling IP forwarding is required for shared bridges. Is this correct? According to the Virtualization guide,

    Enabling IP forwarding (net.ipv4.ip_forward = 1) is also required for shared bridges and the default bridge. Note that installing libvirt enables this variable so it will be enabled when the virtualization packages are installed unless it was manually disabled.

Environment

  • Red Hat Enterprise Linux 5.5
  • Red Hat Enterprise Linux 6.0
  • KVM

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