Minimum globally routable address space?
I am writing from a small, multi-homed ISP. We are contemplating terminating our relationship with one of our providers, and will need to replace that non-portable space. We are debating between getting a /20 from ARIN (we have justifiable usage) or a /20 from our other provider. On one hand, portability would be nice. On the other, is a /20 globally routable in practice? I seem to remember hearing that /19 was the smallest that would not be filtered by anyone. If anyone knows if there are filters for /20s out there, I would be interested to know who filters them. Thanks, Dan Streufert
On Tue, 20 Feb 2001, Dan Streufert <dans@icss.com> wrote:
On one hand, portability would be nice. On the other, is a /20 globally routable in practice? I seem to remember hearing that /19 was the smallest
Yes, you'll be fine with a /20 from the blocks that ARIN allocates from. When we applied for IP space about a year ago, our /20 came out of 216/8. ARIN is currently allocating from 64/8, 65/8, and 66/8, so providers changed their filters to permit that. You can read various provider filtering policies at http://www.nanog.org/filter.html ; Verio's is the most restrictive. Cheers, Troy
participants (2)
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Dan Streufert -
Troy Davis