Closing as Fix Released for upstream and for disco (netplan.io 0.95
contained the fix):
netplan.io (0.95) disco; urgency=medium
.
* New upstream release:
- Added support for WPA Enterprise / 802.1x authentication (LP: #1739578)
- Added support for setting up IP tunnels; supporting the types: ipip,
gretap, VTI, ISATAP (NetworkManager only), sit, gre, ipip6 and ip6ip6.
+ Fixes sit (ipv6) tunnels using Hurricane Electric (LP: #1799487)
- Add support to override networkd UseMTU setting (LP: #1807273)
- Generate output files in dependency order
- Refactored unit and integration tests, along with various cleanups.
- Add DHCP overrides to control route usage and default metric for DHCP
routes. (LP: #1776228)
- Mitigate against bad matching on devices behind bonds then they share
the same MAC from a physical interface. (LP: #1804861)
- Added snapcraft.yaml.
** Description changed:
+ [Impact]
+ DHCP configurations where custom settings (MTU) need to be applied. This is a
subset of the changes presented in bug 1759014.
+
+ [Test case]
+ 1) Configure netplan for the particulars of the network by configuring an
appropriate dhcp{4,6}-override stanza:
+
+ network:
+ version: 2
+ ethernets:
+ engreen:
+ dhcp4: true
+ dhcp4-overrides:
+ use-mtu: false
+
+ Additionally, if so required, add a custom MTU to the configuration.
+ e.g.
+
+ mtu: 1700
+
+ (See https://netplan.io/reference#dhcp-overrides for the available
+ options)
+
+ 2) Run 'netplan apply' or reboot to have the configuration applied.
+ 3) Validate that the routes / DNS are properly ignored and/or replaced by the
defined values.
+
+ [Regression potential]
+ Minimal; this adds new values to the configuration generated for networkd or
NetworkManager. Existing configurations will remain unchanged, but new
configurations using the dhcp{4,6}-overrides fields will benefit from
additional flexibility.
+
+ ---
+
This is very similar to https://bugs.launchpad.net/bugs/1724895, but I
decided to open this as i have tried what has succeeded for others.
Thanks for any assistance.
I'm trying to set the MTU to 1500 and using a match on mac address, but
after a netplan apply or reboot, it does not change or stick. This is on
a EC2 T2.Medium instance. Actual configuration from a dev server:
network:
- version: 2
- ethernets:
- eth0:
- match:
- macaddress: 12:0f:ae:49:5d:06
- mtu: 1500
- dhcp4: true
- nameservers:
- search: [ devbuilds.vpc, ec2.internal ]
+ version: 2
+ ethernets:
+ eth0:
+ match:
+ macaddress: 12:0f:ae:49:5d:06
+ mtu: 1500
+ dhcp4: true
+ nameservers:
+ search: [ devbuilds.vpc, ec2.internal ]
$> cat /var/run/systemd/network/10-netplan-eth0.link
[Match]
MACAddress=12:0f:ae:49:5d:06
[Link]
WakeOnLan=off
MTUBytes=1500
$> cat /var/run/systemd/network/10-netplan-eth0.network
[Match]
MACAddress=12:0f:ae:49:5d:06
[Network]
DHCP=ipv4
Domains=devbuilds.vpc ec2.internal
[DHCP]
UseMTU=true
RouteMetric=100
$> ip link show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP mode
DEFAULT group default qlen 1000
- link/ether 12:0f:ae:49:5d:06 brd ff:ff:ff:ff:ff:ff
+ link/ether 12:0f:ae:49:5d:06 brd ff:ff:ff:ff:ff:ff
# manually set MTU
$> sudo ip link set dev eth0 mtu 1500
$> ip link show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode
DEFAULT group default qlen 1000
- link/ether 12:0f:ae:49:5d:06 brd ff:ff:ff:ff:ff:ff
+ link/ether 12:0f:ae:49:5d:06 brd ff:ff:ff:ff:ff:ff
$> sudo netplan generate
$> sudo netplan apply
$> ip link show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP mode
DEFAULT group default qlen 1000
- link/ether 12:0f:ae:49:5d:06 brd ff:ff:ff:ff:ff:ff
+ link/ether 12:0f:ae:49:5d:06 brd ff:ff:ff:ff:ff:ff
The last netplan commands could be replaced with a reboot with the same
result. This configuration seemed to help others, so hopefully i'm
simply missing something or perhaps this is related to EC2?
Attaching output of cloud-init
** Also affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Changed in: netplan
Status: Fix Committed => Fix Released
** Changed in: netplan.io (Ubuntu)
Importance: Undecided => Medium
** Changed in: netplan.io (Ubuntu)
Status: New => In Progress
** Changed in: netplan.io (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1807273
Title:
netplan not respecting mtu
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