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Autoconf via XREQ/XREP

Autoconf via XREQ/XREP. Charles E. Perkins IETF 77 March 26, 2010. Scenarios – gateway or standalone. A manet can be standalone (no Internet g/w) If a gateway exists, manet nodes may try to get a topologically correct global address (or NATted address)

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Autoconf via XREQ/XREP

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  1. Autoconf via XREQ/XREP Charles E. Perkins IETF 77 March 26, 2010

  2. Scenarios – gateway or standalone • A manet can be standalone (no Internet g/w) • If a gateway exists, manet nodes may try to get a topologically correct global address (or NATted address) • If gateway exists, it sends occasional beacons • Gateways can come and go • Even if a gateway exists, a node may not need a global address

  3. Want an address? Just ask! • A node gets an address by requesting it. • Tricky: for routability of the request packet, the node already needs an address • Solution: pick a random address to use for some number of milliseconds • For IPv6, this is great – short least time makes failure case astronomically unlikely • For IPv4, still pretty darned good.

  4. Standalone • Node doesn’t receive any beacon, so it picks a random address in a preallocated range (perhaps subnet of MANET_LOCAL prefix) • Floods XREQ. If XREP arrives, the address is taken and the node must try again • Even if node misses hearing a beacon and floods the XREQ, it may indicate that a global address is preferable.

  5. Gateway operation • If node hears a beacon, pick random temporary address in subrange of the advertised prefix and unicast a XREQ to the gateway. • Node can also unicast a XREQ to the gateway with temporary address in subrange of MANET_LOCAL, if it does not want global address • Multiple gateways are possible – node picks

  6. Mobile IP • Natural model for support if gateway exists – use locally allocated address as care-of address. • If home agent is in the MANET, more fun – but the node acts as if it is on the home network so just have to tweak business about gratuitous ARP and so on.

  7. Contributors (circa 2001) • Ryuji Wakikawa • Elizabeth Belding • Anders Nilsson • JariMalinen • Yuan Sun • Antti J. Tuominen • Charles E. Perkins

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