IPv4 No guarantee of routability

Dear CCIE:

I just want to know when APNIC says:

** IMPORTANT THINGS TO KNOW **

1. The address range assigned to your organisation is portable

If you change transit providers, the address range remains with
your organisation.

2. This assignment cannot be further sub-delegated to your customers

This is for your infrastructure only.

3. No guarantee of routability

APNIC cannot guarantee that any address space will be globally
routable.

Specially the Item # 3:

"No guarantee of routability
APNIC cannot guarantee that any address space will be globally routable."

What does that mean? I got a new /23 block of IP addresses but I can only access Yahoo and not the other sites. Did you have a similar experience.

I appreciate your response.

-Richard

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Comments

dtlokee

You're a CCIE?

ITdude

Lets give him the benefit of the doubt. Maybe they are assuming he is.

dtlokee

I was gonna go look for a box of razorblades...

Well, any prefix longer than a /19 may not be accepted by all ISPs (although this is not typically the case, but it was back around 2000 to reduce the size of the routing tables). This issue shows when you have a provider independent IP address block that can't be aggregated into your ISP's larger address space. Additionally you need to ensure you are advertising the block via BGP to your provider, or your provider is advertising it for you.

ITdude

You see, I knew the instructor side of you would rise to the surface, dt!

Actually after re-reading the post, it appears that the Dear CCIE: Is written by him trying to address the question to a CCIE. I always "try" to find the good in people, first.

cisco_trooper

Jesus tap-dancing Christ. Any questions?