24 Mar
2017
24 Mar
'17
2:10 p.m.
Subject:
Re: [44net] Trouble creating a Gateway into 44net
From:
"Augustine Tabeling, W8AWT" <w8awt(a)qsl.net>
Date:
03/24/2017 12:36 PM
To:
44net(a)hamradio.ucsd.edu
"An alternative when you do not want to do as much on your brother's computer
> and do have a Linux system yourself, is to just forward all IPIP traffic received
> by your brother's computer to your computer over the local network, and run
> ampr-ripd etc on your own computer. "
> ---
> This is exactly what I want to do but I have no Idea how to do it. By "all IPIP
traffic" do you mean _only_ the IP Protocol 4 Traffic or do you mean effectivly all
IP traffic (I dont think that would be ok.)? I ask this because my brothers
> computer has several websites and a few other web services (IRC, SSH, FTP, Minecraft)
running on it and everything that I do cannot interfere with them.
On a Linux system, this is easy.
IPIP stands for "IP in IP" which is the protocol that is used for AMPRnet
tunnels. The outer IP packet has protocol 4, the inner IP packet is the actual packet to
be transferred.
Use the following command to send all incoming IPIP traffic (IP protocol 4) to another
system using a destination NAT rule:
*|iptables -t nat -A PREROUTING -p 4 -j DNAT --to-destination 1.2.3.4|*
Instead of the 1.2.3.4 you put the IP address of your own computer.
The replies to those packets can be sent directly to the router so it is not required to
configure a reverse for this.
(assuming the router does NAT itself)
This command has to be repeated every time the computer is booted.
To do that, you can add it to the file /etc/rc.local
Rob