Approach to allocating netblocks

Jason Biel jason at biel-tech.com
Wed Jan 14 10:34:29 CST 2009


Customer should have the forethought to request the right amount of space to
include for growth.

If customer requested more space, rather than grow into another adjacent
block, we would just assign them an additional block elsewhere in the
overall subnet, and route both blocks to them.

Jason

On Wed, Jan 14, 2009 at 10:30 AM, Frank Bulk <frnkblk at iname.com> wrote:

> I see what you're saying, but what if the customer whom you assigned the
> 0/30 to wants a larger block...rather than making them renumber (which in
> the case of a small customer, is a very painful experience because of all
> the DNS and router/firewall reconfiguration issues that they don't normally
> deal with and therefore cause their service provider (us) and their
> consultant a lot of grief), I would want to give them 0/29.  But if the
> 4/30
> is already assigned to someone else, I'm stuck.
>
> But perhaps the BCP is to make the customer renumber, in which case I'm
> making things more complicated than they need to be.
>
> Frank
>
> -----Original Message-----
> From: Dave Israel [mailto:davei at otd.com]
> Sent: Wednesday, January 14, 2009 10:17 AM
> To: frnkblk at iname.com
> Cc: NANOG list
> Subject: Re: Approach to allocating netblocks
>
>
> If most of your allocations are small, and you don't plan on growing
> them very often, you'll probably do better with starting at the ends and
> working your way inward.For example,. for /30s, allocate 0/30,  then
> 4/30,  248/30, and 252/30 before moving in to 8/30, 12/30, 240/30, and
> 244/30.  That way you're preserving larger netblocks for as long as
> possible before breaking them up.
>
>
> Frank Bulk wrote:
> > For the first time we have our own ARIN-assigned netblocks that we can
> now
> > split out and divide to our customers.
> >
> > What's the best approach to handing out /30's, /29's, etc. that is
> efficient
> > as possible but allows for customers to expand their allocation to a
> > neighboring block?
> >
> > I was thinking of having one /24 for each block size, and then do the
> divide
> > and conquer approach by allocating the first /30, for example, as 0 and
> 128,
> > then next two at 64 and 192, etc.  Once there's only one /30 free between
> > each allocation, I would start using another /24.  Of course, that would
> > mean 50% (or less) utilization.
> >
> > Ideas?
> >
> > Frank
> >
> >
>
>
>


-- 
Jason Biel
jason at biel-tech.com



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