RHEL6: No response to IPv6 Neighbour Solicitation messages causing connectivity issues

Solution In Progress - Updated -

Issue

  • It has been observed from packet captures that the ipv6 Neighbour Solicitation were being sent by the clients. But the RHEL hosts were not responding with Neighbour Advertisements therefore IPv6 addresses were unreachable.
  • When the above happens there are some TCP retransmissions observed as well.

Environment

  • Red Hat Enterprise Linux 6
  • IPv6 routing

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