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Codeape
Asked: 2010-10-19 01:26:28 +0800 CST

Linux tool for IPv6 unsolicited neighbor advertisements

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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.

linux ipv6 ndp

3 Answers

  1. Best Answer

    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
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  2. 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.

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  3. 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).

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