Public bug reported:
I have the following /etc/netplan/10-bridge.yaml, based on the example
in the netplan(5) man page.
network:
version: 2
ethernets:
br0devs:
match:
name: ens[78]
mtu: 1280
bridges:
br0:
interfaces: [br0devs]
addresses:
- 10.10.10.2/24
The only other file in /etc/netplan is 50-cloud-init.yaml which only
touches ens3.
I expect that the MTU of the ens7 and ens8 are 1280.
They are not:
ubuntu@bridgevm:~$ ip l
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
mode DEFAULT group default qlen 1000
link/ether 52:54:00:5a:61:16 brd ff:ff:ff:ff:ff:ff
3: ens7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0
state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:b7:08:53 brd ff:ff:ff:ff:ff:ff
4: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0
state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:60:f3:ec brd ff:ff:ff:ff:ff:ff
5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode
DEFAULT group default qlen 1000
link/ether 32:86:59:06:1b:ec brd ff:ff:ff:ff:ff:ff
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: nplan 0.30
ProcVersionSignature: User Name 4.13.0-32.35-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
Date: Tue Jan 30 13:35:50 2018
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: nplan (Ubuntu)
Importance: Undecided
Status: Invalid
** Tags: amd64 apport-bug artful uec-images
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https://bugs.launchpad.net/bugs/1746246
Title:
MTU setting not honoured for bridge device
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