IPv6 black lists?

John Payne john at sackheads.org
Wed Mar 10 23:51:22 CET 2010

On Mar 10, 2010, at 4:14 PM, Brian E Carpenter wrote:

> Yes. An ADSL subcriber with a single /64 might have any number of
> hosts - 3 or 4 for a domestic customer, hundreds for a business
> customer unwilling to pay extra for a /56 or /48. In the first
> case it's absolutely reasonable to assume that one infected PC means
> that all the hosts are infected. In the second case that is very
> unreasonable, and there's a strong risk of blocking quite legitimate
> servers.

I think you're overly optimistic about business customers :)
I've seen infections spread across companies that haven't touched residential users.  Residential users are also less likely to have company policies blocking them upgrading things as basic as web browsers.

Plus, this is only for SMTP.... putting your mail server on the same layer 2 network as your end users is a recipe for fail.  Especially in the IPv6 world where you can't claim address shortage :)

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