I am trying to setup a home server under Centos. I relegated my well working iptables script to plan B. The server acts as a modem/router. enp3s0 is the NIC for the internal private network. enp6s0/ ppp0 provide WAN access. I assigned enp3s0 to internal zone and added services. pppoe daemon is up and running and has an IP address assigned from the ISP. In /etc/../ifcfg-ppp0 I set ETH=enp6s0. Question: do I need to assign both - enp6s0 and ppp0 - to external zone? Thx for your help.