Here is one reason for some to care :
If you want to do interdomain multicast, and your
address space is not announced globally (say because you have a /24 that is
not from the swamp), you are likely to be black-holed
due to RPF failures (as your unicast and multicast routing is likely to be different).
This has caused problems from time to time...
Regards
Marshall Eubanks
On Tuesday, December 10, 2002, at 05:58 AM, David Schwartz wrote:
It doesn't matter. For all practical purposes, basement multihomers onlyI 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.
care that their two or three providers have their route.
Ask your ISP if they'll let you choose. But it usually doesn't matter, ifDo ISPs get to choose where the allocation comes from?
you can only justify a /24, you'll find about the same filtering policies in
both traditional class A space and class C space.
But again, it doesn't matter. So long as each of your providers will honor
your route (and why wouldn't they, you're paying them to) you shouldn't have
a problem.
Just pick your most reliable provider, and the one you're pretty sure you're
going to stay with the longest, and get your IP space from them. Make sure
they don't mind you advertising your block through other providers.
And give some thought to hiring a competent consultant to help you. You can
hire a consultant even if you are the consultant. In fact, no competent
consultant would do otherwise outside his or her area of expertise. Don't
learn to multihome at your client's expense. ;)
DS
Regards
Marshall EubanksThis e-mail may contain confidential and proprietary information of Multicast Technologies, Inc, subject to Non-Disclosure Agreements T.M. Eubanks Multicast Technologies, Inc. 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : [EMAIL PROTECTED] http://www.multicasttech.com Test your network for multicast : http://www.multicasttech.com/mt/ Status of Multicast on the Web : http://www.multicasttech.com/status/index.html
