I have a Nethserver 7.6 with 2 nic’s, a red one to the internet (192.168.0.5) and a green one (10.0.0.1) default gateway 192.168.0.1.
I have dhcpd on the green NIC. I have an AD (192.168.0.10) running.
I have a Windows 10 system on the green NIC he gets a ip and he does login to the AD, that works. The Windows 10 can ping the red and the green NIC, no other adresses. I want the machine to be able to enter the network past the red NIC (go on the internet).
(Done this with iptables on Ubuntu server but Nethserver works a bit difference)
Found it: I had to reconfigure my NIC’s. Now in the firewall configuration I have an extra option to route lan to internet. So for people who want to do this: have a good working red and green nic and install the firewall. Now you have an option in the firewall setup to redirect green to red nic.