I booted a system from the 6.5 ISO on a hostonly network.
I configured the network using nmcli. I was able to ssh in from the host.
nmcli con mod enp0s3 ipv4.ipaddresses 192.168.102.10/24
nmcli con mod enp0s3 ipv4.gateway 192.168.102.1
nmcli con mod enp0s3 ipv4.dns 192.168.102.10
nmcli con mod enp0s3 ipv4.method manual
nmcli con mod enp0s3 connection.autoconnect yes
nmcli con up enp0s3
I can then log in from my host. and the connection shows that it is up.
I run simp config and simp bootstrap. bootstrap fails because it can't connect to the puppetserver on port 8150 but systemctl status puppetserver shows that it is active.