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SSH PortForwarding
Configure Simple SSHSecure Shell Port-Forwarding
Run these commands on the server that will be performing the port forwarding.
1. Enable IP Forwarding
sudo sysctl net.ipv4.ip_forward=1
2. Forward traffic on port 1111 to IP 1.1.1.1 on port 22
sudo iptables -t nat -A PREROUTING -p tcp --dport 1111 -j DNAT --to-destination 1.1.1.1:22
dport = incoming port that will forward the traffic
to-destination = server IP address and port that you are forwarding to
3. Ask iptables to Masquerade
sudo iptables -t nat -A POSTROUTING -j MASQUERADE
4. Test
From the client PC, SSHSecure Shell to the server that is doing the port forwarding. If the server doing the port forwarding is 2.2.2.2, then ssh to 2.2.2.2:1111. You should be connected to 1.1.1.1 via SSHSecure Shell (port 22).
5. Save iptables rules
sudo sh -c "iptables-save > /etc/iptables.rules"
6. Automatically apply iptables rules at startup
a. Edit the interface the rules apply to by editing /etc/network/interfaces
At the end of the network related lines for that interface, add the line:
pre-up iptables-restore < /etc/iptables.rules
b. Edit /etc/sysctl.conf by adding the line net.ipv4.ip_forward = 1.
If you want to keep information from byte and packet counters, use the command:
sudo sh -c "iptables-save -c > /etc/iptables.rules"
List PREROUTING Rules
sudo iptables -t nat {--line-numbers} -L
Delete NATNetwork Address Translation Rule
sudo iptables -t nat -D PREROUTING [line #]
Note: The option "-t nat" are not needed when you want to delete POSTROUTING, INPUT, or OUTPUT rules.