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Re: [lir-wg] Discussion about RIPE-261

  • To: "Michel Py" < >
  • From: Kurt Erik Lindqvist < >
  • Date: Thu, 29 May 2003 09:07:35 +0200
  • Cc: "Gert Doering" < >
    < >
The *benefit* of "/48 multihoming" is that you can filter those
routes if you don't want to see them - then your routers will
send packets down the /32 road, and eventually hit a router
that knows about the /48 (which is why I consider this approach
superior to "everybody gets a independent prefix", which I can't
properly aggregate).

This does _not_ work in at least two cases:

- If someone implements RPF checks and someone else filters.

RPF will most likely break with most of the proposed multi6 solutions.
- If the primary ISP (the one that announces the /32) dies. The site is
dead as well. This is the #1 reason why organizations do multihome: they
want to be up even if their primary ISP tanks.
You mean if /48s where filtered? So don't filter ;-) That was the original idea with the proposal...

- kurtis -

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