Bug 89506 - systemd network: MTUBytes ignored for NetDev kind "gre"
Summary: systemd network: MTUBytes ignored for NetDev kind "gre"
Status: RESOLVED FIXED
Alias: None
Product: systemd
Classification: Unclassified
Component: general (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Tom Gundersen
QA Contact: systemd-bugs
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-03-09 21:26 UTC by linus.luessing
Modified: 2019-08-19 10:17 UTC (History)
0 users

See Also:
i915 platform:
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Attachments

Description linus.luessing 2015-03-09 21:26:48 UTC 
We are having a recent Arch Linux here, but unfortunately the MTUBytes option seems to get ignored for GRE tunnels:

-----
$ cat /etc/systemd/network/31-somename.netdev
[NetDev]
Name=somename
Kind=gre
MTUBytes=1400

[Tunnel]
Local=xxx.xxx.xxx.xxx
Remote=yyy.yyy.yyy.yyy
TTL=64
-----

Even after a complete system reboot the MTU is set to 1476 instead of 1400.


Systemd packages:
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$ pacman -Qs "systemd"
local/libsystemd 218-2
    systemd client libraries
local/systemd 218-2
    system and service manager
local/systemd-sysvcompat 218-2 (base)
    sysvinit compat for systemd
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Comment 1 Lennart Poettering 2019-08-19 10:17:00 UTC 
I am pretty sure this has long been fixed, the current code explicitly sets IFLA_MTU for all interfaces that are created. If this still is a problem, please open a new issue on the github instance.

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