Neighbor Solicitation sent with every packet after RA route changed

Solution Verified - Updated -

Issue

  • Router Advertized route is lowest metric route for a route class, e.g. default.
  • ip -6 route change modified Router Advertisement created route, change includes gateway modification.
  • Router Advertised packet received after ip -6 route change to re-add RA route.
  • Neighbour Table purged of RA route gateway address by neighbour garbage collection
  • Every (or almost every) sent packet results in Neighbour Solicitation to the gateway of the Router Advertised route.
  • sysctl net.ipv6.conf.*.accept_ra = 1

Environment

  • Red Hat Enterprise Linux 7
  • IPv6
  • net.ipv6.conf.*.accept_ra = 1 enabled to accept Router Advertisements

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