Submission type

• Bug report
• Request for enhancement (RFE)

NOTE: Do not submit anything other than bug reports or RFEs via the issue tracker!

systemd version the issue has been seen with

current master

NOTE: Do not submit bug reports about anything but the two most recently released systemd versions upstream!

Used distribution

Arch Linux arm

Only one specific Router Advertisement message is needed to basically kill the network connections of all systems in a network running systemd-networkd with ipv6.
It is pretty much the attack stated in RFC862 section 5.5.3.e
See my comments in #5636 for details.