The fix for this bug broke the IPv6 networking on one of my systems.

When the RA does not include any MTU information, this patch causes no IPv6 
default route to be added at all, leaving the system without IPv6 connectivity. 
The journal in this case shows:

  systemd-networkd[397]: eno1: Failed to get default router MTU from RA: No 
data available

A workaround is to add MTU information to the RA from the router, but I don’t 
think this should be necessary.

Rob Leslie

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