1. Enable IP Forwarding [Edit /etc/sysctl.conf to uncomment net.ipv4.ip_forward.] sysctl -w net.ipv4.ip_forward=1 2. Configure iptables a. [Modify physical network interface name, ZeroTier interface name.] PHY_IFACE=eth0 ZT_IFACE=ztxxxxxxx b. [Add rules to iptables] iptables -t nat -A POSTROUTING -o $PHY_IFACE -j MASQUERADE iptables -A FORWARD -i $ZT_IFACE -o $PHY_IFACE -j ACCEPT iptables -A FORWARD -i $PHY_IFACE -o $ZT_IFACE -m state --state RELATED,ESTABLISHED -j ACCEPT c. [Save iptables rules for next boot] apt install iptables-persistent bash -c iptables-save > /etc/iptables/rules.v4
