Autoconf via xreq xrep
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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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Autoconf via xreq xrep

Autoconf via XREQ/XREP

Charles E. Perkins

IETF 77

March 26, 2010


Scenarios gateway or standalone

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


Want an address just ask

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.


Standalone

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.


Gateway operation

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


Mobile ip

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.


Contributors circa 2001

Contributors (circa 2001)

  • Ryuji Wakikawa

  • Elizabeth Belding

  • Anders Nilsson

  • JariMalinen

  • Yuan Sun

  • Antti J. Tuominen

  • Charles E. Perkins


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