Date: Fri, 6 Sep 2019 10:56:08 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: freebsd-net@freebsd.org Subject: Re: Several IPv6 routers and default gateway choice Message-ID: <20190906035608.GA45741@admin.sibptus.ru> In-Reply-To: <20190902.044135.1812305046881448068.hrs@allbsd.org> References: <20190830021228.GA66465@admin.sibptus.ru> <20190830.121543.1108900942284640156.hrs@allbsd.org> <20190901141047.GA56954@admin.sibptus.ru> <20190902.044135.1812305046881448068.hrs@allbsd.org>
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--k1lZvvs/B4yU6o8G Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hiroki Sato wrote: > va> Can any IPv6 unicast or link-local address be configured as an anycast > va> address of a router? >=20 > Yes. There is no restriction about address scope. >=20 > You might want to read RFC 4291, which defines Subnet-Router anycast > address, and RFC 2526, which defines the other reserved IPv6 subnet > anycast addresses. In general, the former one can be used for > routing purpose. Interestingly, RFC4291 says that "All routers are required to support the Subnet-Router anycast addresses for the subnets to which they have interfaces." In practice, I don't observe this. A FreeBSD router does not configure such an address automatically, for example. RFC2526 is dim, I think it's because of this RFC the last usable address on a subnet ends in ff7f instead of ffff. I wonder if anyone anywhere uses those subnet anycast addresses. --=20 Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/ --k1lZvvs/B4yU6o8G Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJdcdjYAAoJEA2k8lmbXsY0ZkwIAI7CqOwHnSuTok5E8rdFoU4/ NkyphmkaZtJT1T8zczdQc8H3lVEMH5mucXRLkXv3pmCYfY6DGsXVhC5tCf5fCaFD +i2CnArD3nP4r1NtGehJNXwM2PsD2KJBMf+nOXSNnsRjL5w4cL1yR1edm2cggfU0 RoR+gclhddhTgmkBiQOZkbuJhfHfMv6QJcpwFFlo7hDl4SO2yAUvZq5juml21wnX s/1gAskyH6G8C5MD8xBMMJ0qm3ghllZrj2gzbiE0lgmX9z8y1c9CK2msLz7l2/aL RlP6CjKwqgrzdLS/lzA351sHAz6Z5Z+dluQfvia3EkywP3aFNbUzHPvxoJSqMjE= =ZKVL -----END PGP SIGNATURE----- --k1lZvvs/B4yU6o8G--
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