This is an old revision of the document!
Debian Setup als Router
eth0 = WAN eth1 = LAN
- Open a new Putty Terminal and connect to server
- Enter following command to edit interfaces file:
# vim /etc/network/interfaces
- Edit the file with the following lines: (add your netmask and gateway)
- /etc/network/interfaces
auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto eth1 iface eth1 inet static address 172.168.1.1 netmask 255.255.255.0
- Now edit /etc/sysctl.conf and uncomment:
# net.ipv4.ip_forward=1>
so that it reads: net.ipv4.ip_forward=1
and save it by entering
:wq
- To enable IP masquerading, enter following set of commands in terminal:
# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # iptables -A FORWARD -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT # iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
Update: Fix strange “-–state” causing command to fail and fix nat MASQUERADE to eth0 (wan interface)
# apt‐get install iptables‐persistent
https://askubuntu.com/questions/590920/ubuntu-14-04-as-a-gateway-router-and-a-firewall
Bessere Lösung → https://gridscale.io/community/knowledgebase/tutorial-debian-routergateway-in-10-minuten/