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AODV update Charles E. Perkins Elizabeth M. Royer Samir R. Das.

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Presentation on theme: "AODV update Charles E. Perkins Elizabeth M. Royer Samir R. Das."— Presentation transcript:

1 AODV update Charles E. Perkins Elizabeth M. Royer Samir R. Das

2 MobiHOC

3 Forgetting sequence numbers Suppose A  D via B, C  D via B Suppose B reboots and forgets everything Suppose A does not know this yet If B sends RREQ to C a routing loop results A B C D

4 DELETE PERIOD Long enough for B’s neighbors to find out that links to B have broken After neighbors find out, they maintain last sequence number for at least DELETE_PERIOD After reboot, B sends RERRs in response to receiving any data packets Lifetime of route assumes dual role

5 Multicast – after reboot A node loses all of its multicast tree info Broadcast a MACT with ‘R’ bit set Upstream neighbors delete the node from any relevant lists of next hops Downstream neighbors try to rebuild their tree branch

6 IP Address Autoconfiguration Some nodes may not have IP addresses Following zeroconf idea, try /16 Pick an address from upper 62k range Perform duplicate address detection by sending RREQ for that address For source address of RREQ, pretend to be a node in lower 2k range Sequence numbers to be zero

7 Other details Assigned type numbers for extensions Changes appendix added Typos, improvements Corrected sequence number handling in RERR message

8 Other issues IPv6 versions for messages by next IETF Should RREQ/RREP contain source routes? –if so, how long should route information persist? Rethink service discovery extensions?


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