To:
Pekka Savola <pekkas@netcore.fi>
CC:
Ralph Droms <rdroms@cisco.com>, dnsop@cafax.se
From:
Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
Date:
Sat, 9 Aug 2003 08:08:48 +0859 ()
In-Reply-To:
<Pine.LNX.4.44.0308081438500.2900-100000@netcore.fi> from PekkaSavola at "Aug 8, 2003 02:43:50 pm"
Sender:
owner-dnsop@cafax.se
Subject:
Re: the well-known address approach
Pekka Savola; > The argument I've heard a lot is one of architectural purity, as the > address architecture states (for example): The proper interpretation of the address architecture RFC is that IPv6 WG does not know anything about address (not only anycast one) architecture. The RFC says: > An IPv6 unicast address refers to a single interface. > When a unicast address is assigned to more than one interface, without defining "assign". The confusion, seemingly, is a result of an attempot to purposelessly distinguish a subnet and a link. Purposeful requirements are that a subnet, which is identical to a link, may have multiple address prefixes and that a link may be divided into virtual links such as VLAN, which is purely an L2 issue. > 2.6 Anycast Addresses > An IPv6 anycast address is an address that is assigned to more than > one interface (typically belonging to different nodes), > are syntactically indistinguishable from unicast addresses. When a > unicast address is assigned to more than one interface, thus turning > it into an anycast address, If a host (or a router or a node or whatever) have a unicast address assigned to an interface, the host must receive a packet to the address, even if the packet is received on another interface. In addition, if a host have a unicast address assigned to an interface, the host may send a packet from the address, even if the packet is sent from another interface. That is, all the unicast addresses of a multi-interface host are assigned to more than one interface and are anycast ones. > Needless to say I disagree with this model... :-) Yup. Masataka Ohta #---------------------------------------------------------------------- # To unsubscribe, send a message to <dnsop-request@cafax.se>.