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I believe systemd-networkd has its own implementation of DHCP and therefore doesn't use dhclient. But I wonder if it's behavior is any better in this respect.

This has piqued my interest.

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systemd-networkd keeps open that kind of socket for LLDP but apparently not for the DHCP client code. wpa_supplicant also keeps open this type of socket on my local system. and the dhcpd daemons on my routers have some of those too for each interface...

i wonder if the slow path here could be avoided by using separate network namespaces in a way these sockets don't even get to see the packets...

Interesting.

Looks like LLDP can be switched off in the network config.

https://systemd.network/systemd.network.html

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