RHEL6: Packets with VLAN tags are not bridged
Issue
- A RHEL host is configured with a bridge
br0
- The bridge contains at least one physical interface
if0
supporting hardware VLAN acceleration (for example an Intel 82599 based NIC with theixgbe
driver) - Other interfaces on the bridge could be virtual machines or other physical interfaces
- The bridge contains at least one physical interface
- The host also has a VLAN configured on the bridge,
br0.NNN
- VLAN tagged packets coming from
if0
are correctly received by the host, but are not forwarded to other bridged interfaces when appropriate.
Environment
- Red Hat Enterprise Linux 6
- KVM guests (not essential, but the most common configuration in which this occurs)
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