I should note that this is marked as Fix Released in debian, but from
the debian bug comments it just looks like Chris asked for that bug to
be closed as a configuration issue (which this is not).
This is actually only a VLAN issue with higher-than-default mtu. The
bond does not have anything to do with the problem. The problem is the
vlan package (required for ifupdown vlan support) installs a udev rule
that triggers for each new interface; it checks the ifupdown
configuration, and creates any corresponding vlan interfaces. The real
interface and all its vlan interfaces then race to finish udev
processing and notify upstart, which then calls ifup directly on each
interface. If upstart calls ifup for the vlan before the actual
interface (and the vlan has a high mtu), it will fail while being
brought up.
I think this can be fixed in a similar way to bug 1609367, where the
problem is higher-than-default mtu on ipv6 (i.e. inet6 section);
although in an easier way, since ifupdown already requires the 'vlan'
package for vlan support, and that package provides an if-pre-up script
already.
If we edit the /etc/network/if-pre-up.d/vlan script (from the vlan
package) like below (for trusty, similar patch for x and y), it will
increase the raw device's mtu if needed.
--- vlan.orig 2016-09-08 02:12:55.901172000 +0000
+++ vlan 2016-09-08 02:10:49.213172000 +0000
@@ -51,7 +51,14 @@
echo "$IF_VLAN_RAW_DEVICE does not exist, unable to create $IFACE"
exit 1
fi
- ip link set up dev $IF_VLAN_RAW_DEVICE
+ if [ -n "$IF_MTU" ]; then
+ CUR_DEV_MTU=`cat /sys/class/net/$IF_VLAN_RAW_DEVICE/mtu`
+ # increase the vlan raw device mtu if needed
+ if [ -n "$CUR_DEV_MTU" ] && [ $CUR_DEV_MTU -lt $IF_MTU ]; then
+ MTU_PARAM="mtu $IF_MTU"
+ fi
+ fi
+ ip link set up dev $IF_VLAN_RAW_DEVICE $MTU_PARAM
vconfig add $IF_VLAN_RAW_DEVICE $VLANID
fi
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https://bugs.launchpad.net/bugs/1224007
Title:
mtu not always set properly on bond/vlan interface
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