Address Assignment Question

John Peach john-nanog at
Mon Jun 20 13:33:41 UTC 2011

On Mon, 20 Jun 2011 09:26:30 -0400
Steve Richardson <steverich.nanog at> wrote:

> Hi Jason,
> On Mon, Jun 20, 2011 at 9:06 AM, Jason Baugher
> <jason at> wrote:
> > Did everyone miss that the customer didn't request a /24, they
> > requested a "/24s worth in even more dis-contiguous blocks". I can
> > only think of one reason why a customer would specifically ask for
> > that. They are concerned that they'll get blacklisted. They're
> > hoping if they do, it will be a small block of many rather than one
> > entire block.
> >
> > When customers make strange requests without giving a good
> > explanation, I have to assume they're up to something.
> >
> > Jason
> They provided an explanation, describing how the IPs were going to be
> used.  Yes, part of it does have to do with being blocked, which
> *definitely* concerns me.  One thing they do say is that they need
> several IPs per block to assign to their MTAs to handle such a large
> amount of email (3 to 5 million per day).  Being primarily focused on
> layers 1 through 4, I don't have an incredible amount of experience
> with high volume email server configuration, so I have no idea if they
> are feeding me a line of BS or not.
> My feeling is that (paraphrasing here) "we might get blocked
> occasionally" and "we need this many IPs on our MTAs because they
> can't handle the load" are *not* legitimate reasons for requesting so
> many addresses.

If it helps you make your mind up, please give us the ranges you are
going to give them and we'll pre-emptively block them.....

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