2) Small multihomers must get the ISP that assigns them address space to allocate them at least a /24 (with multihoming as the justification if needed). The ISP must agree to allow them to advertise their allocation through other providers and must agree to hear and announce the block from the customer *and* *other* *ISPs*.
Hello, Doesn't this mean that unless filtering policies change, after Class C space is used up, the multihomer will have to get a /22 from the ISP (since after Class C gets used up allocations will be made from Class A space). There are only three /8s left in the Class C space. Harsha.
On Tue, Dec 10, 2002 at 12:45:42PM -0800, Harsha Narayan wrote:
2) Small multihomers must get the ISP that assigns them address space to allocate them at least a /24 (with multihoming as the justification if needed). The ISP must agree to allow them to advertise their allocation through other providers and must agree to hear and announce the block from the customer *and* *other* *ISPs*.
Hello, Doesn't this mean that unless filtering policies change, after Class C space is used up, the multihomer will have to get a /22 from the ISP (since after Class C gets used up allocations will be made from Class A space). There are only three /8s left in the Class C space.
To be accepted into Verio's space per the URL that forrest@almighty.c64.org pasted... you are correct. I still think this is a rare method of filtering... and perhaps Verio will change their policy to be /24 everywhere once the Classfull C ranges are gone. As others have mentioned... not all providers filter in the same way, and sometimes the methods are not published..... Its relatively safe to make a *vague* judgement that a /24 will get you reachable via *most* of the net. -- ,N ~Nathan - routing & switching dude/fly-boy/sport biker - San Jose CA~
On Tue, 10 Dec 2002 12:45:42 -0800 (PST), Harsha Narayan wrote:
Doesn't this mean that unless filtering policies change, after Class C space is used up, the multihomer will have to get a /22 from the ISP (since after Class C gets used up allocations will be made from Class A space). There are only three /8s left in the Class C space.
No. Providers who you don't pay to carry your route can reach you through the larger aggregate. In fact, even the /24 requirement can be ignored if all your providers reach each other directly or can convince their transit providers to carry smaller routes. DS
participants (3)
-
David Schwartz -
Harsha Narayan -
N