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Date: Sat, 25 Oct 2014 09:07:45 -0700
From: Darren Pilgrim <list_freebsd@bluerosetech.com>
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To: pepe <plaine@gmail.com>, freebsd-questions@freebsd.org
Subject: Re: IPv6 aliases on FreeBSD 10
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On 10/25/2014 1:00 AM, pepe wrote:
> I know it's usually done with /64, but my ISP just said: your block is
> 2001:14b8:1801::/48 and
> defaultrouter should be ::1. So I can't really change that.

They meant your allocation is 2001:14b8:1801::/48.  You can subnet that 
however you like.  Subnetting at /64 is BCP for a lot of reasons.