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Subject: Re: IPv6 experimentation in jails.
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References: <2d8044a2a2d8a5dd0f73d7db03bb962b.squirrel@webmail.harte-lyne.ca>
From: Anton Yuzhaninov <citrin+bsd@citrin.ru>
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Date: Wed, 5 Apr 2017 17:53:53 -0400
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On 04/05/17 17:18, James B. Byrne via freebsd-questions wrote:
> How does one enable and properly configure a working ipv6 i/f on a
> Freebsd host where the host is presently located on an ipv4 network
> with no ipv6 gateway?

In this case you will need to use IPv6 tunnel, e. g. from Hurricane
Electric:
https://www.tunnelbroker.net/