[systemd-bugs] [Bug 89506] New: systemd network: MTUBytes ignored for NetDev kind "gre"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89506

            Bug ID: 89506
           Summary: systemd network: MTUBytes ignored for NetDev kind
                    "gre"
           Product: systemd
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: linus.luessing at c0d3.blue
        QA Contact: systemd-bugs at lists.freedesktop.org

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:
-----
$ 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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