On Mon, 2019-10-28 at 10:53 -0400, Louis Garcia via networkmanager-list
wrote:
> Just upgraded to NM 1.20 and notice NM is listening on port 68.
>
> $ ss -tulpn
> udp UNCONN 0 0 0.0.0.0:67
> 0.0.0.0:* users: "dhcpd",pid=608,fd=11))
> udp UNCONN 0 0 165.270.73.136%enp1s0:68
> 0.0.0.0:* users:(("NetworkManager",pid=490,fd=20))
>
> enp1s0 is set to automatic (DHCP) addresses only. NM 1.18 had the
> same setup and did not show up on netstat. Is this new?
>
> Thanks.This is DHCP. If you use main.dhcp=dhclient, then DHCP will be done by a different process, and NM won't listen this socket. Maybe you had that in 1.18? Also, AFAIK dhclient doesn't use a UDP socket, instead it always uses a raw socket. NetworkManager's DHCP library (which is taken from systemd- networkd) uses a UDP socket when possible. best, Thomas
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