[arin-ppml] Why are ISPs allowed?
stephen at sprunk.org
Fri Jan 2 16:46:44 EST 2009
Artur (eBoundHost) wrote:
> My apologies if I'm asking a question that has been answered a million times, I have not been able to find an answer.
> Is there a reason why ISP's such as Comcast/ATT, allowed to hand out unique IP addresses, even not static ones, to end users?
Current policy says that assignments are justified if 25% of the space
is used immediately and 50% of the space is used within one year. It is
reasonable to assume that each customer has at least one host
(otherwise, why would they buy the service?) and thus assigning one
address per customer is automatically justified.
> Why are they not required to use NAT?
NAT is generally considered "evil" and, so far, there is no consensus in
the community that ISPs should be _required_ to use it. It is an
_optional_ technology that allows folks to use fewer addresses than
would be justified.
> If ISPs were to switch to local address space, how many IP blocks would
> be released back into the wild?
Most of them, I'd bet.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 3241 bytes
Desc: S/MIME Cryptographic Signature
More information about the ARIN-PPML