It's been reverted.
commit 95ab9eff1e24cf996cd4111a93e3a8b29ff0f524
Author: Andrew Jeddeloh <andrewjedde...@gmail.com>
Date: Thu Oct 5 03:58:02 2017 -0700
Revert "networkd: change UseMTU default to true. (#6837)" (#6950)
This reverts commit 22043e4317ecd2bc7834b48a6d364de76bb26d91.
UseMTU is broken on real hardware and should not be enabled by default.
On Sat, Sep 30, 2017 at 5:30 AM, Andrew Jeddeloh <andrew.jedde...@coreos.com
> wrote:
> I saw in https://github.com/systemd/systemd/pull/6936 that networkd's
> UseMTU will be enabled by default in 235. There is an bug
> https://github.com/systemd/systemd/issues/6593 that causes networkd to
> loop continually setting and unsetting the MTU on most real hardware
> if UseMTU is set and the the DHCP lease specifies a larger value than
> what the driver is currently using.
>
> This can be reproduced on with the e1000 ethernet driver as well as
> ixgbe. See https://github.com/coreos/bugs/issues/1827#issuecomment-
> 321129028
> for reproduction setups using a Container Linux image and dnsmasq
> locally.
>
> This bug should be fixed before UseMTU is enabled by default.
>
> -Andrew Jeddeloh
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> systemd-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/systemd-devel
>
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