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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.

Codeape
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3 Answers3

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

https://www.rfc-editor.org/rfc/rfc2461#section-7.2.6

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

apt-get install vzctl
Community
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Matías E. Fernández
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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.

Marcin
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You may also want to look at libndp:

ndptool -t na -U -i ${int} -T ${ipv6addr} send

As per my paraphrasing of the man page:

-t na - Send a "NA" or Neighbor Advertisement (equivalent of an ARP response "xyz is at").

-U - this is unsolicited (nobody asked for it).

-i ${int} - which interface to send it on.

-T - What is the target address in the NS/NA message.

send - to trigger sending (the other option is simply monitor).

Jaco Kroon
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