-
Notifications
You must be signed in to change notification settings - Fork 4
Theory of operation
AMPRNet (also known as 44net) uses a full mesh configuration employing IPIP (IP protocol 4 - encap) tunnels. Each node maintains a complete list of all possible link partners and uses this information to directly forward IP traffic via a P2MP IPIP tunnel interface to the needed peers.
A central gateway, keeps track of these peers and provides a consolidated list of hosts/subnets with their relevant gateway information (the public IP via which the tunnel endpoint can be reached). Traditionally this information is provided as a text file which is available for download after registration on the AMPRNet portal (http://portal.ampr.org). This information has to be parsed and routes have to be set up accordingly.
In addition to the download method, the AMPRnet gatway provides up to date RIPv2 informations via a IPIP tunnel to their registered gateways, which contain the encapsulation information. Each RIP entry contains a subnet address, a netmask and the gateway IP address for that specific subnet. The RIPv2 data is sent out every 5 minutes as multicast traffic.