[ppml] 2005-1 and/or Multi6
dr at cluenet.de
Thu Apr 14 07:14:13 EDT 2005
On Thu, Apr 14, 2005 at 11:35:27AM +0100, Michael.Dillon at radianz.com wrote:
> > Can anyone please define "swamp"? What does the collection of PI
> > prefixes differ in compared to the collection of PA aggregate prefixes
> > other than probably prefix length?
> My definition of "swamp" is an IP address range in which
> many LONG prefixes (small blocks) are allocated for us in
> a provider independent (PI) manner with little to no
> possibility of aggregating those prefixes into shorter
Which is no difference to the collection of PA aggregates. You can't
aggregate them anymore too.
> In IPv6, this is bad because it means that more bits
> will have to be consumed by the global routing table,
> communicated in BGP announcements, and processed in
> routing calculations.
I don't think this assertion is accurate. Protocols carry IP addresses
in fixed-length fields. An IPv6 prefix will always take 128 bits.
Please don't go back to pre-CIDR, really.
> I do not believe that we will see the same improvements
> in memory capacity, processor power, and circuit
> capacity that we saw in IPv4's heyday because we are
> now approaching real physical limits to such improvement.
Oh? Any scientific reference to that?
I can remember modem manufacturers saying that when 2400bps modems
were state of the art.
> At the same time, IPv6 increases the average prefix length
> even if /32 is the longest prefix to be announced.
> We have to allocate PI addresses to these so-called
> end-sites because to do otherwise is restraint of trade.
> However, it is unwise and imprudent to offer them /48
> prefixes which are highly wasteful of global router capacity
> when we could give them shorter /32 prefixes.
That makes no sense. I don't see any wastage of "global router
capacity". Prefix length doesn't matter to CIDR routers, unless
they contain ill-advised optimizations. The only optimization I
could accept is on the /64 boundary.
> P.S. I say "so-called" end sites because I believe that it
> is untrue to view the Internet as something which has a center
> and edges where the edges are populated by end-sites. Those
> so-called end-sites are often internetworks in their own right.
I couldn't agree more.
CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0
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