Uni-directional Link Routing

At the beginning there were two proposed solutions to the problem of sending routing information over uni-directional links:

• Modify the routing protocols to cope with the presence of a uni-directional link.
• Hide the uni-directional links problem, by using tunneling to hide the uni-directional link. This implies that there's a back channel through the normal internet, in addition to the satellite link.

• Terminology
• Ongoing Work on Tunneling
  • INRIA
  • WIDE project at Japan Satellite Systems Inc.
• Discussion
  • How do we support ARP if the receiver is not a router?
  • Receiver is a router: static IP address
  • Receiver is a router: dynamic IP address
  • Use of IP-in-IP or GRE?