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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