![]() ![]() I've often found that requiring MPPE encryption and enabling stateful MPPE encryption are important. ![]() The key to getting pptpconfig to work properly is to make sure the encryption settings are configured exactly as your network administrator has them set. The venerable pptpconfig tool also is available with many distributions. Figure 2 provides a similar configuration in NetworkManager.įigure 4: Importing a Cisco certificate in KVpnc.Įven though the user interface programmers can't spell particularly well (notice the word "proprietary" is misspelled in my version of the program Figure 4), the KVpnc team has created an implementation that works particularly well with Cisco devices. The GUI VPN applications are getting much better at adding routes on their own. In some cases, if you don't add these routes, the packets that you intended to go through the VPN tunnel will be routed through your wireless or Ethernet card instead of your VPN interface. Or specify the routes with the use of the VPN software GUI interface. The route command is the standard: route add -net 13.163.97.23 netmask 255.255.255.255 dev ppp0Īlso, you can use the ip command ip route add 171.87.44.54/24 dev ppp0 Other times I used the VPN GUI application. Sometimes I would do this with the route command (as root). Many times when I have helped troubleshoot "failed" VPN connections, all I had to do was simply add a few alternative routes to the default routing table. Even though you have a VPN tunnel, your network interface might still try to route packets across the Internet, rather than through the VPN tunnel. The need for explicit routing is especially important when your remote network is using public IP addresses. Many Windows administrators consider this one of the biggest challenges in working with Linux clients. Sometimes you'll find it necessary to explicitly route packets through a specific interface. If, for example, you are using iptables on your Linux firewall and your VPN server has the IP address 189.44.45.3, you would enter the following: iptables -I FORWARD -p 47 -d 189.44.45.3 -j ACCEPT Routing Packets through the Connection Allow Generic Route Encapsulation (GRE) protocol to pass through the firewall. If you're trying to connect a VPN client to a Microsoft PPTP connection and you are using a Linux box as a firewall for your broadband connection, you'll have to take an additional step. ![]()
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