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Date: Sun, 8 Aug 2010 01:05:00 -0400
From: Gary Palmer <gpalmer@freebsd.org>
To: Hiroki Sato <hrs@FreeBSD.org>
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References: <4C5E33BB.50809@ukr.net> <20100808.135605.22069970.hrs@allbsd.org>
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Cc: freebsd-net@FreeBSD.org, universite@ukr.net
Subject: Re: Does not work resolving IPv6 addresses via IPv4 DNS-server
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On Sun, Aug 08, 2010 at 01:56:05PM +0900, Hiroki Sato wrote:
> "Vladislav V. Prodan" <universite@ukr.net> wrote
>   in <4C5E33BB.50809@ukr.net>:
> 
> un> # host -6 2001:5c0:1000:b::599b 8.8.8.8
> un> socket.c:1859: internal_send: ::ffff:8.8.8.8#53: Invalid argument
> un> socket.c:1859: internal_send: ::ffff:8.8.8.8#53: Invalid argument
> un> ;; connection timed out; no servers could be reached
> 
>  The above command specifies IPv4 as the transport to 8.8.8.8.

I believe you mean that the -6 flag specifies that the utility use 
IPv6 as the transport to reach the IPv4 address 8.8.8.8

Regards,

Gary