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Dickson Loh wrote:

> First, I've got a server running on both IPv4 and IPv6, with 
> A records and 
> AAAA records on the DNS. Then I have client on Windows XP 
> (and another one 
> on Windows Server 2003), which has IPv6 enabled.
> 
> When I'm on a LAN that is not IPv6 enabled, my clients are 
> still resolving the domain names to the IPv6 address.
> How can I force it such that my clients resolve to the
> IPv4 address rather than the IPv6 address?

You can't. There are four things you can do for these cases:

1) Use the applications specific IPv4 switch

eg "PuTTY -4"

2) Use DNS names with IPv4 addresses

eg:
 purgatory.unfix.org      AAAA 3ffe:8114:2000:240:290:27ff:fe24:c19f
                          A    195.64.92.136
 purgatory.ipv6.unfix.org AAAA 3ffe:8114:2000:240:290:27ff:fe24:c19f
 purgatory.ipv4.unfix.org A    195.64.92.136

This way if you want to specifically use IPv4.
use the correct DNS name, but it defaults to IPv6
with a fallback to IPv4 if the app supports it.

3) netsh interface ipv6 set route 0::/0 ::1

Blackhole the default route so that any outgoing connections
fail, well behaved applications will fall back directly.

4) ipv6 uninstall

This will completely disable IPv6 support.

Greets,
 Jeroen

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