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Setting Up PPP
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As you saw earlier, when you ssh to the client machine, the PPP daemon will launch and start filling your screen with data garbage. To get the two machines to connect, you need to have the PPP daemon on the server machine launch to respond to the client s PPP daemon. The problem is that you can t launch pppd very well if there s a constant garbage stream that the client machine is outputting. You ll need to use a tool called pty-redir to get around this. This little program will execute a passed command on a separate TTY. First download pty-redir (from http://www.shinythings.com/pty-redir/), and use the following set of commands to install it:
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make sudo mkdir /usr/local/bin sudo cp pty-redir /usr/local/bin
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These commands will put the pty-redir binary in your /usr/local/bin directory. To test it, use the following command:
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sudo /usr/local/bin/pty-redir /usr/bin/ssh cedge@cedgetestcomputer.318.com.
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You should see a result along the lines of /dev/ttyp4. This output tells you which TTY was allocated for your command and where its output is going. In this case, the client machine s PPP daemon is sending its connection information to the redirected TTY. To complete the link, launch pppd on the server machine and have it use the redirected port. This is accomplished with the following command (replace /dev/ttyp4 with the output of pty-redir):
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sudo /usr/sbin/pppd /dev/ttyp4 local noauth proxyarp persist 192.168.10.1:10.0.0.55.
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CHAPTER 15: Remote Connectivity
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This will tell the server machine s PPP daemon to use the redirected TTY and use the IP address of 10.0.1.1 for the other end of the PPP link. The client machine s IP would be 10.0.0.55. If everything is working up to this point, you should be able to ping 10.0.0.55 and get a response from the client machine. This verifies that your connection is up and running.
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Configuring Routing
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Now that the tunnel is up, you can use a static route to point to the client machine s network. You will then be able to pass traffic to other hosts on the client s network through the encrypted PPP tunnel securely. If the network you are trying to access is 10.0.0.0/24, you would use the following command to create a route for traffic directed at specific IP addresses:
sudo /sbin/route add -net 10.0.0.0/24 10.0.0.55
Depending on the client machine s routing setup, you might be able to have the server machine pass all Internet traffic through the client machine. This is a good way to help secure traffic if you re using a wireless access point in a public place. You can bring up the VPN connection and then change your default route with the following command:
sudo /sbin/route add -net 0.0.0.0 10.0.0.55
This will route all of your Internet traffic through the VPN link, securing your wireless traffic. Remember, it might likely take a hit in performance, slowing things down a bit, as your traffic will be encrypted, passed through the tunnel, decrypted, passed out of the client machine, and then passed out onto the Internet. Performance slowdowns are an expected result.
Disconnecting
The process to disconnect is fairly simple. On the server, use ps ax | grep pppd to search for the PPP daemon s process ID. Then use the sudo kill <Process ID>command to stop the daemon. The server machine s PPP daemon will bring down the link. This allows the client machine s PPP daemon to quit. Upon quitting, the client machine will log the VPN user out of the connection. At this point, the PPP connection will have stopped, both daemons will have quit, and your SSH connection should be disconnected.
Summary
Remote access is invaluable to administrators, whether you re managing a small office or a large corporate network. If you take care to configure VPN tunnels and remote management properly, you can securely connect to your LAN and administer your systems without making those same tools an avenue for attacks.
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