On 24-okt-2007, at 17:03, Jeroen Massar wrote:
There are other differences. You forgot anycast and you forgot to mention that only
Since when is anycast an exclusive IPv6 property? Anycast is a routing trick. Nothing more, nothing less.
People have been using this for ages already.
Note that the anycast that the DNS guys and 6to4 relays use and the anycast defined for IPv6 are two very different things. The former is indeed a routing trick (hack, really), while the latter is something that's done on the link layer. From a book I happen to know well:
"Multicast and anycast addresses may be used as destination addresses in packets, but only unicast addresses may be used as source addresses. Also, only routers may be configured with an IPv6 anycast address. This means that strictly, anycasting services such as the DNS isn’t compatible with RFC 3513. After all, for anycast DNS to work, the anycast address must be present on more than one DNS server (which presumably are hosts and not routers), and the responses to DNS queries are sent back with the destination address of the query (the anycast address) as the source address. The host that sent the query wouldn’t recognize the response if it came from a different address. However, anycasting services is rarely done using the actual IPv6 anycast link-level mechanism, where several systems configured with the same anycast address are connected to the same subnet."
However, I don't believe the IPv6 link anycast service is all that widely implemented in routers.
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