Red Hat Bugzilla – Bug 174671
[PATCH] bonding: don't drop non-VLAN traffic
Last modified: 2007-11-30 17:07:21 EST
Note: This bug appeared in Fedora Legacy for FC2. This is apparently still
a problem in the 2.6 kernel for RHEL 4. See Roland Pope's comment of 2005-
Hope this helps. -David
+++ This bug was initially created as a clone of Bug #162208 +++
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Description of problem:
Patch for the bonding driver that was released after FC2 went legacy. The
problem was when the system had an IP it was using on its bond0 interface and an
IP configured on a VLAN interface, the bond0 IP stopped working.
This is a patch submitted to netdev by Jay Vosburgh:
Change the bonding driver to not drop non-VLAN traffic when a
VLAN is configured above it. Originally fixed by Olaf Kirch
<firstname.lastname@example.org>; I changed his patch slightly to update comments.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Bring up a bonded interface
2. Assign an IP address to bond0, e.g. 192.168.3.5
3. Assign an IP address on a VLAN on bond0.XXX, e.g. 192.168.8.5
Actual Results: The IP address on bond0 (192.168.3.5) would stop working when
the bond0.XXX interface was brought up.
Expected Results: Configured IP addresses on both bond0 and bond0.XXX should
have coexisted peacefully.
Jay's post of the patch to the netdev list:
-- Additional comment from email@example.com on 2005-06-30 16:42 EST --
Created an attachment (id=116185)
Jay Vosburgh/Olaf Kirch's "don't drop non-VLAN traffic" patch
-- Additional comment from firstname.lastname@example.org on 2005-07-30 20:23 EST --
Did this make it into a more recent upstream kernel?
<snip Fedora Legacy status change post by Pekka Savola>
-- Additional comment from email@example.com on 2005-11-28 21:42 EST --
Any reason why this fix hasn't made it into the kernel yet? Especially Given
the length of time this BUG has been open and triviality of the patch? I
personally found this problem wasted a large amount of my time under RedHat
Enterprise 4 as it broke a machine that was working with VLAN's under a bonding
interface under Enterprise 3 and there was no obvious reason as no errors were
logged and the bonded interface just ate non VLAN packets.
Shouldn't this BUG be logged against RedHat Enterprise 4 as maybe it would get
a little more priority?
<snip duplicate post from Roland Pope>
<snip Fedora-Legacy response post by Pekka Savola>
Created attachment 121717 [details]
Test kernels w/ above patch are available here:
Please verify that they work as expected, and post the results here...thanks!
Using this kernel, I can now configure an IP address onto the BONDx interface
and it continues to work after bringing up a BONDx.nnnn VLAN Interface. Prior
to this patch, the BOND0 Interface stopped transmitting packets as soon as the
first VLAN sub Interface was activated.
In addition to this, it appears I lied when I said this was working on RedHat
Enterprise 3 Update 6 (I thought from memory it work, but alas...no). I have
gone back and tested this again under the 2.4.21-37.EL kernel and it behaves
the same as the Unpatched Enterprise 4 kernel. As soon as you bringup the first
VLAN interface on a bonded device, you loose the ability to transmit no VLAN
So would it also be possible to get this patch added to the Enterprise 3
committed in stream U4 build 34.21. A test kernel with this patch is available
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 the 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.