Address Assignment Question

Steven Bellovin smb at
Tue Jun 21 01:55:22 UTC 2011

On Jun 20, 2011, at 5:52 27PM, John Levine wrote:

>> They have inquired about IPv6 already, but it's only gone so far as
>> that.  I would gladly give them a /64 and be done with it, but my
>> concern is that they are going to want several /64 subnets for the
>> same reason and I don't really *think* it's a legitimate reason.
> No legitimate mailer needs more than one /64 per physical network.
> Same reason.
Note that the OP spoke of assigning them one /64, rather than one per
physical net.  I also note that ARIN, at least, suggests "/56 for small 
sites, those expected to need only a few subnets over the next 5 years",
which would seem to include this site even without their justification.
All they need -- or, I suspect, need to assert -- is to have
multiple physical networks.  They can claim a production net, a DMZ,
a management net, a back-end net for their databases, a developer
net, and no one would question an architecture like that....

		--Steve Bellovin,

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