Controlling repeated route discovery attempt
# when TTL is set to Net_Diameter, how many times should the originating nodes be attempt to discover route in a network wide manner?
# RFC says this should be done using binary exponential backoff
# first time when a network-wide route discovery is done
- timeout = Net_Traversal_time
- wait this long for RREP before the 2nd attempt for the same destination is made
# binary exponential backoff means
- timeout for attempt (k+1) = 2 x timeout for attempt K
# maximum number of retries = RREQ_RETRIES
- RFC recommend RREQ_RETRIES be set to 2