This bug was fixed in the package systemd - 242-7ubuntu3.7
---
systemd (242-7ubuntu3.7) eoan; urgency=medium
[ Dariusz Gadomski ]
*
d/p/lp1762391/0001-Call-getgroups-to-know-size-of-supplementary-groups-.patch,
d/p/lp1762391/0002-user-util-tweak-to-in_gid.patch,
** Tags removed: verification-needed verification-needed-eoan
** Tags added: verification-done verification-done-eoan
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https://bugs.launchpad.net/bugs/1846232
Verified VLANs on Eoan using systemd 242-7ubuntu3.7 from -proposed
correctly set the MTU to 1500 when specified in the netplan config.
** Attachment added: "curtin vmtest logs for vlan mtu verification"
Eoan vmtests for vlan MTU checks now pass:
(neipa) vlan-mtu % egrep "242-7ubuntu3.3"
output/EoanTestNetworkVlan/logs/install-serial.log
[ 131.271209] cloud-init[765]: Get:12 http://archive.ubuntu.com/ubuntu
eoan-proposed/main amd64 libnss-systemd amd64 242-7ubuntu3.3 [126 kB]
[ 131.281683]
** Attachment added: "curtin vmtest logs for vlan mtu issue"
https://bugs.launchpad.net/curtin/+bug/1846232/+attachment/5325684/+files/bug-1846232-curtin-vmtest-verification.tar.gz
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Hello Dan, or anyone else affected,
Accepted systemd into eoan-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/systemd/242-7ubuntu3.3
in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
** Description changed:
[impact]
vlan interface has wrong mtu, which may cause lost packets due to
incorrect mtu
[test case]
configure a system using the netplan cfg similar to comment 2.
alternately, networkd config can be used, similar to:
** Description changed:
+ [impact]
+
+ vlan interface has wrong mtu, which may cause lost packets due to
+ incorrect mtu
+
+ [test case]
+
+ configure a system using the netplan cfg similar to comment 2.
+
+ alternately, networkd config can be used, similar to:
+
+
** Also affects: systemd (Ubuntu Eoan)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu Eoan)
Status: New => In Progress
** Changed in: systemd (Ubuntu Eoan)
Importance: Undecided => Medium
** Changed in: systemd (Ubuntu Eoan)
Assignee: (unassigned) =>
** Changed in: systemd
Status: Unknown => Fix Released
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https://bugs.launchpad.net/bugs/1846232
Title:
networkd pads interface MTU by 4 bytes for
I believe this is due to
https://github.com/systemd/systemd/commit/4b151b71320bbee1549afcbad5554a40d90d63b4
and probably is
https://github.com/systemd/systemd/issues/12552
fixed by
https://github.com/systemd/systemd/pull/12574/commits
which prevents the automatic mtu bump when MTUBytes is
> This looks to be related to networkd:
sorry, I didn't read comments before posting, you found it already :)
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https://bugs.launchpad.net/bugs/1846232
Title:
** Summary changed:
- vmtests: test_ip_output failing in vlan tests on eoan
+ networkd pads interface MTU by 4 bytes for vlan even when told not to
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