commit f837df366632721a41e82089267b3fac0d4516d4
author Sam Balana <sbalana@google.com> Sat Oct 10 01:02:50 2020 +0000
committer CQ Bot <commit-bot@chromium.org> Sat Oct 10 01:02:50 2020 +0000
tree 56b15c28c728b6b0edbcaf7af65835414a405a2a
parent 82a4664765aca713a17a4b4ae5d452eea4a4273e

[netstack] Use neighbor unreachability detection

Flip the flag to replace the current implementation of ARP and NDP
through linkAddrCache, with an implementation of NUD through
neighborCache. Switching to using NUD for both ARP and NDP is beneficial
for the reasons described by RFC 4861 Section 3.1:

  "[Using NUD] significantly improves the robustness of packet delivery
  in the presence of failing routers, partially failing or partitioned
  links, or nodes that change their link-layer addresses. For instance,
  mobile nodes can move off-link without losing any connectivity due to
  stale ARP caches."

  "Unlike ARP, Neighbor Unreachability Detection detects half-link
  failures and avoids sending traffic to neighbors with which two-way
  connectivity is absent."

Bug: 61723
Change-Id: I1146bce6d512545ad4679475147849cb50f4ecb7
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/420454
Commit-Queue: Sam Balana <sbalana@google.com>
Reviewed-by: Tamir Duberstein <tamird@google.com>
Reviewed-by: Ghanan Gowripalan <ghanan@google.com>
Testability-Review: Tamir Duberstein <tamird@google.com>
Testability-Review: Ghanan Gowripalan <ghanan@google.com>