[ppml] Dynamic IPs and IP runout

Scott Leibrand sleibrand at internap.com
Thu Aug 23 01:12:31 EDT 2007


I think that's exactly what ISPs will start doing the minute they 
realize there are no more free IP addresses to be had from ARIN.  Until 
then, the incentives are actually the opposite direction: they're better 
off giving every customer a public IP, so they have more public IPs 
available when they convert all the customers to NAT.

This isn't necessarily a bad thing.  If, as part of managing a world 
without an IPv4 free pool, we decide to allow the regulated sale of IPv4 
netblocks, then we will undoubtedly see the "supply" of IP addresses 
switch from the free pool (where they're free) to the low-hanging fruit 
like this.

As Ted mentioned, I think we'd be wasting out time trying to get people 
to voluntarily return to ARIN space reclaimed this way.  But I think we 
can set up the structures over the next couple years such that we have a 
smooth transition between getting IPs from the IPv4 free pool and 
getting them from ISPs who've reclaimed them like this.


mack wrote:
> This is sure to create a firestorm so flame away:
> The biggest consumer of IPs is for end workstations.
> These could be converted to NAT but there is currently no incentive to do so.
> My home ISP still allocates dynamic ips for each DSL modem.
> On the other hand most of these end users are concerned with services available
> on the internet ie. smtp, ftp, http, https, IM,
> voip (which has various implementation some of which don't work well with NAT).
> These service for the most part don't work with both parties behind NAT.
> Additionally, high BW http sites can't be easily placed behind NAT due to flow
> limitations on network equipment.
> Some cable providers have already converted to NAT and I routinely deal with
> double NAT issues at work from end users.
> No one who does actual networking likes NAT, but I think more home users should be
> pushed behind it.
> Obviously some home users operate home businesses and such.
> We all have sidelines.  Therefore if this direction is headed we need to provide exceptions.
> If most users were placed behind NAT they wouldn't notice (except the ones running
> bit torrent, slingbox and VOIP).  Most of my relatives use two applications
> http and smtp (ie. web and e-mail) and wouldn't recognize the acronyms.
> Most businesses don't use much else either and they restrict bit torrent and the like.
> Perhaps we should be pushing reclamation efforts this direction.
> I know the legacy blocks look nice and juicy but the fact is home users are a softer target.
> Someone from ARIN may have figures on how many IPs are assigned to user boxes and how many provide services.
> It would be nice if they shared to determine if this direction has merit.
> LR Mack McBride
> Network Administrator
> Alpha Red, Inc.
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