Mesa connection issue

I'm in linuxcnc 2.8 setting up a 7i96. I followed this tutorial: forum.linuxcnc.org/27-driver-boards/3559...ethernet-mesa-boards

when I try to launch my PlasmaC config I get an error reading:

ERROR: Failed to execute '/sbin/sysctl -q net.ipv6.conf.eth0:avahi.disable_ipv6=1

in the debug info it states:
sysctl: cannot stat /proc/sys/net/ipv6/conf/eth0:avahi/disable_ipv6: No such file or directory

I can ping 10.10.10.10 successfully and my base machine opens fine.

I've been trying for a while to narrow down the problem. Any help would be greatly appreciated.

What does

ip a

print?

Here is the ip a

Right, so you have not setup a static IP address for the host.

Take a look an the hm2_eth manual page for how to do this in the interfaces file

Are you referring to this:
linuxcnc.org/docs/html/man/man9/hm2_eth.9.html

Yes, you can also use the GUI to set up a static IP address on the host
(10.10.10.100 suggested)

The interfaces file method has the advantage of being able to change
driver settings (such at the setting required by Intel MACs for real time)

I can't save the interfaces file with the changes. I'm using mousepad.

you need to be root to edit most system files
so
sudo mousepad

Ok, thanks. I'm only a few months old as a linux user. I made the interfaces file changes.

I now get an error stating that the network is unreachable.

OK what does
ip a
report now?

and whats in the interfaces file?