These are just small hints and memos what to do on a Debian Linux setup. This is not a complete guide on doing a secured routing environment with Linux.
- /etc/sysctl.conf: net.ipv4.ip_forward=1
- Configure /etc/network/interfaces
- iptables -t nat -A POSTROUTING -o <upstream_interface> -j MASQUERADE
- apt-get install iptables-persistent
- apt-get install iftop
- apt-get install conntrack
- conntrack -L -s 10.11.1.10
- apt-get install isc-dhcp-relay