Public bug reported:
On a node with two 10G interfaces, we configure a bond interface from
these two interfaces and then a vlan interface on top of it. The MTU of
these interfaces shall be set to be 1550 instead of the default 1500, so
we have these settings in /etc/network/interfaces.d:
root@controller-node13:~# cat /etc/network/interfaces.d/xge0
auto xge0
iface xge0 inet manual
bond-master xiondata
root@controller-node13:~# cat /etc/network/interfaces.d/xge1
auto xge1
iface xge1 inet manual
bond-master xiondata
root@controller-node13:~# cat /etc/network/interfaces.d/xiondata
auto xiondata
iface xiondata inet manual
bond-slaves xge0 xge1
bond-miimon 100
bond-lacp-rate 1
bond-mode 4
mtu 1550
root@controller-node13:~# cat /etc/network/interfaces.d/xiondata.200
auto xiondata.200
iface xiondata.200 inet static
address 10.80.1.13/24
vlan_raw_device xiondata
mtu 1550
After a reboot, the correct MTU is applied to the vlan interface only
50% of the time, on the other attempts, it stays at 1500, leading to
broken connectivity. If I restart the interfaces manually, by doing
"ifdown xiondata; ifup -a" the MTU settings seem to be applied correctly
every time.
root@controller-node13:~# apt policy ifupdown
ifupdown:
Installed: 0.8.10ubuntu1
Candidate: 0.8.10ubuntu1
Version table:
*** 0.8.10ubuntu1 500
500 http://eu.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ifupdown 0.8.10ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Tue Oct 4 09:44:40 2016
ProcEnviron:
LANGUAGE=en_US:
TERM=screen
PATH=(custom, no user)
LANG=en_US.utf8
SHELL=/bin/bash
SourcePackage: ifupdown
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ifupdown (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug third-party-packages xenial
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https://bugs.launchpad.net/bugs/1630191
Title:
MTU settings not always applied after reboot
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