[UK-CONTEST] N1MM and IPv6

[Robert Chipperfield]

Hi Chris,

IPv4 and v6 will coexist happily - indeed, it's almost impractical to 
run a v6-only network at the moment, as the majority of Internet-based 
servers only have IPv4 addresses at present. (There are services that 
translate between the two, but they're safe to ignore for these purposes.)

At present, almost all ISPs offer only IPv4 Internet connections. There 
are some notable exceptions (AAISP have been most vocal about it 
recently), but none of the major brands do yet.

However, Windows 7 (and Vista) enable IPv6 by default as well as IPv4. 
Whereas in v4-land, it was typical for a computer to have just a single 
address, looking something like 192.168.1.23, IPv6 devices normally have 
at least a couple - one "global" and one "link-local" (and maybe 
others). The latter only applies to your local network, whereas the 
former comes from a range assigned from your ISP. Even without an 
Internet connection, the link-local address still exists, and starts 
with fe80::. You can see this if you ping one Windows 7 machine from 
another using the computer name - it'll tend to resolve to the IPv6 address.

Now, moving back to N1MM: my guess (not being a user of N1MM myself) is 
that it's attempting to resolve a machine name to an IP address, 
expecting to get an IPv4 address, and actually getting IPv6.

You can disable IPv6 by going to Control Panel -> Network and Sharing 
Centre -> Change adapter settings (left hand side) -> Properties of your 
network card, and unchecking "Internet Protocol Version 6". You might 
need to reboot afterwards.

Again, without knowing the details of N1MM's configuration, if it's 
asking for you to specify the name of a server machine, try doing so by 
IP(v4) address rather than machine name - that may be enough of a kick 
to get it working without needing to disable the IPv6 stack entirely.

Hope that helps!
Rob, M0VFC

On 20/08/2012 20:55, Chris G3SJJ wrote:
> Thought I would flesh this out a bit. Some confirmation would be helpful. I am setting up two laptops up for SSB FD. Have done it numerous times
> before but hit a brickwall this time.
>
> As far as I can understand a computer assigns IP addresses for networking and internet access. The current protocol designated IPv4 is being replaced
> by IPv6. I *think* I understand that this uses the computer's Public IP Address as the local IP address. IPv6 is gradually being rolled out in the UK.
>
> When you network computers you use the internal IP address, usually in the range 192. etc. That has always worked for me in the past. As far as I can
> determine you can't use IPv6 addresses to network, or at least you can't mix v4 and v6 which I am trying to do. N1MM doesn't like this and I suspect
> other logging s/w will react the same. One laptop runs W7 with IPv4 and v6, the other is XP with v4.
>
> Any comments, corrections or info will be helpful.
>
> 73 Chris G3SJJ
>
>
>
>
> On 20/08/2012 16:25, Chris G3SJJ wrote:
>> Has anyone experienced networking problems with N1MM on a computer using IPv6 IP addresses?
>>
>> Chris G3SJJ
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