Here is an easy way to make use of IPv4 GRE tunnels in Ubuntu, or any other Debian based distro. You will need to edit /etc/network/interfaces. Here is a template with the information you will need to add: auto tun1 iface tun1 inet static address <tunnel IP> netmask <tunnel subnet mask> pre-up iptunnel add tun1 mode…
Tag: VPN
Creating an OpenVPN Tunnel…
OpenVPN OpenVPN uses Public Key Infrastructure (PKI) to encrypt VPN traffic between nodes. A simple way of setting up a VPN with OpenVPN is to connect the clients through a bridge interface on the VPN server. This guide will assume that one VPN node, the server in this case, has a bridge interface configured. For…
DHCP Relaying over IPSEC with a back end Centos 5.5 server…
Introduction This post is going to be a high level over view of having multiple sites all connecting back to a central office or hosted server in a data center using IPSEC VPN. Before starting make sure you have a IPSEC VPN tunnel up to the office or data center and validate connection both to…