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Enabling routing via iptables is slightly different on Ubuntu than Centos / RHEL. That is explained here in depth using firewalld. On Ubuntu the same can be accomplished but with iptables, a more traditional routing configuration. Secondly, we will create some default UFW firewall rules to secure the exposed (uplink) connection while leaving the LAN interface / IP fully open for local connectivity.
1 2 3 | sudo iptables -t nat -A POSTROUTING -o enx3c18a00091a6 -j MASQUERADE sudo iptables -A FORWARD -i eth0 -o eno1 -m state --state RELATED,ESTABLISHED -j ACCEPT sudo iptables -A FORWARD -i eth1 -o enx3c18a00091a6 -j ACCEPT |
1 2 3 4 5 | sudo ufw default deny incoming sudo ufw default allow outgoing sudo ufw allow from 192.168.2.0/24 sudo ufw default allow FORWARD sudo ufw allow 22/tcp |
