Comment 1 for bug 1846232

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Ryan Harper (raharper) wrote : Re: vmtests: test_ip_output failing in vlan tests on eoan

This looks to be related to networkd:

https://github.com/systemd/systemd/pull/12574/commits

Which is automatically added 4 bytes to base interface MTU, even though we're explicitly setting mtu to 1500 on base interface and vlan.