Unsolicited neighbor advertisements is necessary to facilitate rapid service address takeover in a HA cluster. For IPv4 (ARP) you can use "arping -U", but so far I've had no luck finding any tool that can do something similar for IPv6.

EDIT: After searching more maybe the question is: Is this tool needed for IPv6? To me it looks like NDP should be able to solve this by it self.

  • Are you trying to force the new MAC<->IPv6 mappings on your local segment's neighbours? – Marcin Oct 18 '10 at 13:31

I've been investigating this too. So called Unsolicited Neighbor Advertisements are still required with NDP, see:


On Debian based systems you can use ndsend which you can install as follows:

apt-get install vzctl

parasite6 and fake_advertiser6 are both part of THC-IPv6 They look like they would generate the necessary ICMPv6 packets to force L2/L3 mapping changes.

  • I will check that out. – Codeape Oct 18 '10 at 20:37

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