Hello, Am 04/07/2014 10:33 AM, schrieb Bastien Durel: > Le dimanche 06 avril 2014 à 18:00 +0200, Jan Lühr a écrit : >> Hello folks, >> >> I'm trying to setup an anycast DNS-Service using Debian 7.4 and global >> unicast addresses. >> >> At the moment I'm adding the anycast-IP to the second server >> "ip -6 addr del 2001:67c:20a0:b103::2/64 dev br-ff" >> the kernel runs into a duplicate address detection issue >> >> [81066.037496] br-ff: IPv6 duplicate address 2001:67c:20a0:b103::2 detected! >> >> and the address is not reachable on that server. >> >> What's wrong here? How can I build an anycast DNS service? > Hello, > > AFAIK, anycast is implemented using routing. (I never ran IPv6 anycast > services, but I run IPv4 ones). So you have to add you anycast-ip to > some dummy interface (for example ip a a 2001:67c:20a0:b103::2/128 dev > dummy0) and redistribute the prefix via IGP (ospf, ibgp ...) > You cannot have an address twice on the same link.
Thx for your comment. What I figured out so far: -> In principle you can: http://tools.ietf.org/html/rfc4861#section-7.2.7 -> This is not (yet?) implemented by IP Setting anycast-addresses using "anycast" has no effect. http://man7.org/linux/man-pages/man7/ipv6.7.html I wonder, whether it will be implemented some day, soon. But I'm not sure, if this information is still accurate. -> Routing - yes it is an option. Some (all?) Linux distributions by default do not accept small routes using radvd, Link-Layer multicast is not really possible. Thus, it requires to routers to cooperate. Greetz, Jan -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
