[PLUG] question on how to fix a mysterious DNS address problem

[American Citizen]

Hello all:

The past few days I have been trying to fix some problems with internet 
tranmissions not going correctly

I just now discovered a mysterious name server connection in my 
resolv.conf file which I have no understanding off. I keep editing the 
resolv.conf file and it keeps reappearing

nameserver 10.18.0.1

Here is the resolv.conf file

### /etc/resolv.conf is a symlink to /run/netconfig/resolv.conf
### autogenerated by netconfig!
#
# Before you change this file manually, consider to define the
# static DNS configuration using the following variables in the
# /etc/sysconfig/network/config file:
#     NETCONFIG_DNS_STATIC_SEARCHLIST
#     NETCONFIG_DNS_STATIC_SERVERS
#     NETCONFIG_DNS_FORWARDER
# or disable DNS configuration updates via netconfig by setting:
#     NETCONFIG_DNS_POLICY=''
#
# See also the netconfig(8) manual page and other documentation.
#
### Call "netconfig update -f" to force adjusting of /etc/resolv.conf.
nameserver 10.18.0.1
nameserver 208.67.222.222
nameserver 208.67.220.220

------------

How do I fix this and how do I discover where this mysterious 10.18.0.1 
address is coming from?

I am using network manager under the openSuse Leap 15.4 OS.

Randall