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n-acd: use separate seed state for each probe of the same acd #10

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n-acd: use separate seed state for each probe of the same acd #10

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Commits on Oct 3, 2023

  1. n-acd: use separate seed state for each probe of the same acd 

    Currently, all the probes of an acd instance share the same seed
state. This means that the state is updated by all the probes, and as
a consequence they get different jitters for the wait timeouts;
therefore the order in which addresses become available (and can
configured on the interface) is not deterministic.

Keep a separate seed state for each probe, initialized from the acd
seed. This ensures that all the probes use the same timeouts when
sending probe requests, and that in case of no collision, addresses
are available in the order of probe start.

According to RFC 5227, the reason for the initial random delay is that

   "This initial random delay helps ensure that a large number of
   hosts powered on at the same time do not all send their initial
   probe packets simultaneously"

There is no mention that different addresses on the same interface
should have a different delay.
    @bengal
    bengal committed Oct 3, 2023
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