Date: Thu, 18 Feb 2021 18:40:51 -0800 From: Doug Hardie <bc979@lafn.org> To: "net@freebsd.org" <net@FreeBSD.org> Subject: IPv6 DAD Message-ID: <1AFA2FDE-F382-4EAC-9424-E03570566125@sermon-archive.info>
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The last time I played with IPv6 (FreeBSD 9), DAD was activated when the = network was first configured. Once the interface came up, a neighbor = solicitation was sent with the link-local address to see if it = duplicated anywhere else. Trying that with FreeBSD 13.0-BETA2 it is = quite different. Bringing up an interface does not result in and = solicitations. The MAC based address is just used. If you bring up = another machine with that address, the neighbor solicitation is send and = a response is received. However, the address is still entered as shown = in ndp. There is no attempt to pick a different address. However, = ifconfig now shows duplicated: inet6 fe80::250%bge0 prefixlen 64 duplicated scopeid 0x1 That address on the first machine to have it continues to work and is = accessible from a third machine. I used quite arbitrary addresses for this experiment. =20 I noticed there was a significant update to the RFCs on DAD so I suspect = this behavior is now desired, but it is not obvious. =20 -- Doug
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