| "John Neiberger" wrote in message
| [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
| > If you connect to two separate providers this opens a much larger can
of
| > worms. You're going to need to apply for your own Autonomous System
| number
| > from ARIN (www.arin.net).
|
| Is it possible to coordinate with the two ISPs, and agree that you will
use
| a reserved AS number (49512 or above) that they could both then
communicate
| with you? This would at least avoid having to mess with ARIN.
|
| Mike W.
|
This won't work because even if the two providers agreed to allow you to use
the reserved AS number for communication with them, that ASN would be
stripped once your advertisements reached their networks. Then would then
have to advertise your networks as originating from their own AS. This is
great for the provider who gave you the address space but the other provider
is not allowed to do this.
Another related issue is the concern that your address space will get
aggregated by your original ISP. Even if you had your own ASN, your first
provider will be announcing a less-specific route for your network than your
new provider will. Since routers route based on longest match, all remote
traffic destined for your AS would come through the second ISP.
Yet another related issue is that of getting at least a /24 so that your
routes won't get filtered. Many ISPs filter prefixes with masks longer than
/24. If you don't really need a /24 but you really want redundancy, you're
still wasting addresses that might have been used better elsewhere.
I apologize if any of this isn't very clear. I'm still recovering from a
lot of travel yesterday and my explainer is broken. I was in Chicago for a
SNAM class and I'm going to have to write a review and post it to the list.
It was a KILLER class!
Regards,
John
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