How to disable listening on 'bootpc' port for security reasons

[rhabacker]

Hi,
I'm using wicket on an openSUSE Leap 15.4 host and recognized that the associated process wickedd-dhcp4 listens on a public port.

$ sudo netstat -ltup | grep dhcp4
udp     4352      0 0.0.0.0:bootpc          0.0.0.0:*                           1375/wickedd-dhcp4  

The used bootpc port looks like this:

$ grep bootpc /etc/services
bootpc             68/tcp       # Bootstrap Protocol Client  [Bill_Croft]
bootpc             68/udp       # Bootstrap Protocol Client  [Bill_Croft]

For security reasons I want to disable this port, but I did not found any related config option in the wicket configuration.

I tried to search for wicked disable bootpc port on the internet, which gave me no hints.

I also tried to search in the wicket config

$ sudo grep -rni bootpc  /etc/wicked
<empty>

and in the actual network config

$ sudo grep -rni bootpc /etc/sysconfig/network/
<empty>

How to disable listening on that port or at least make it listening on localhost.