[54088] in North American Network Operators' Group
Re: FW: /8s and filtering
daemon@ATHENA.MIT.EDU (Harsha Narayan)
Tue Dec 10 13:48:29 2002
Date: Tue, 10 Dec 2002 10:47:29 -0800 (PST)
From: Harsha Narayan <hnarayan@cs.ucsd.edu>
To: Forrest <forrest@almighty.c64.org>
Cc: <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.44.0212101236220.31544-100000@almighty.c64.org>
Errors-To: owner-nanog-outgoing@merit.edu
Hello,
I had the same questions. Could someone please answer these?
Harsha.
On Tue, 10 Dec 2002, Forrest wrote:
>
>
> >
> > >I was also curious about this - if I am a customer who wants to
> > >multihome and can justify only a /24, I would go to an ISP which has an
> > >allocation from the Class C space rather than one from the Class A
> > >space.
> >
> > It doesn't matter. For all practical purposes, basement multihomers
> > only
> > care that their two or three providers have their route.
>
>
> Maybe I'm missing something, but what good would it do for someone to
> multihome if only their own providers accept their route, but nobody else
> does? I realize that their block should be still announced with their
> ISP's larger aggregate, but what good does this do if your ISP goes down
> and can't announce the large aggregate.
>
> If you're a smaller organization, perhaps you'll only have a /23 from your
> upstream provider. With the filtering that seems to be in place, it seems
> like the only way you can truly multihome with a /23 is if it happens to
> be in the old Class C space. Or is this wrong?
>
> What seems to be needed is perhaps a /8 set aside by the RIR specifically
> to allocate to small organizations that wish to multihome that people
> would accept /24 and shorter from.
>
> Forrest
>
>
