Re: HEADS UP: an IPv4-mapped IPv6 address off by default

[Jeroen C . van Gelderen]

Umemoto-san,

May I ask what motivated this change?

-J

On Thursday, Jul 25, 2002, at 11:51 US/Eastern, Hajimu UMEMOTO wrote:

> Hi,
>
> I've just committed to change an IPv4-mapped IPv6 address off by
> default.
> The existing applications may be affected this change.  The
> applications which depend on an IPv4-mapped IPv6 address will become
> listen only an IPv6 socket.
> Apache2 is known having this problem.  You may need to specify the
> Listen directive explicitly in your httpd.conf like as follows:
>
>   Listen 0.0.0.0:80
>   Listen [::]:80
>
> If you still want to use an IPv4-mapped IPv6 address, please specify
>
>   ipv6_ipv4mapping="YES"
>
> in your /etc/rc.conf.
>
> Sincerely,
>
> --
> Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
> [EMAIL PROTECTED]  [EMAIL PROTECTED]  ume@{,jp.}FreeBSD.org
> http://www.imasy.org/~ume/
>
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Re: HEADS UP: an IPv4-mapped IPv6 address off by default

[Hajimu UMEMOTO]

Hi,

> On Thu, 25 Jul 2002 12:50:49 -0400
> "Jeroen C.van Gelderen" <[EMAIL PROTECTED]> said:

jeroen> May I ask what motivated this change?

Yes.  There is discussion that an IPv4-mapped IPv6 address has
potential security weakness in developping application and/or
operating servers.  NetBSD's default is off, and OpenBSD doesn't
support an IPv4-mapped IPv6 address.

Sincerely,

--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
[EMAIL PROTECTED]  [EMAIL PROTECTED]  ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/

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