[lir-wg] Discussion about RIPE-261
Michel Py michel at arneill-py.sacramento.ca.us
Tue May 27 22:14:27 CEST 2003
Gert, > Gert Doering wrote: > 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. - 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. Please look at the following (4 slides, very short) http://arneill-py.sacramento.ca.us/ipv6mh/pa_holes.ppt Then come back to me and tell me that PA holes and filtering work together. The slides should be self-explanatory but they were designed for live presentation. I do welcome questions. Michel.
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