[UK-CONTEST] N1MM and IPv6

Tue Aug 21 14:28:17 EDT 2012

I was pondering the email trail below, and have just finished conducting 
a few experiments.

Using a ***standard*** CAT5e cable I set up a two laptop network, no 
router, hub etc, by using a static IP address of 192.168.0.1 / 2 With a 
subnet mask of 255.255.255.0, Gateway of 192.168.0.1.

This worked fine between two up to date laptops.

Changing the Cat5e cable to a crossover cable ***failed to work***.

Then changing one of the laptops to an old Dell laptop, the 
***standard*** Cat5e cable worked OK, and the cross over cable worked OK.

1000Mb Ethernet Cards use all 4 pairs of a network cable to function, 
whereas slower, older Ethernet cards use 1 or 2 pairs of a Cat5e cable 
to work.I guess therefore that the crossover cable is only a crossover 
for one pair, and indeed upon investigation this is is the case.

Therefore when setting up networked stations, check your cables!
You may have an old crossover cable, with one or more up to date 
PC's....worth a check.

Its typical of ADSL Router manufacturers to use a Class C, non routed IP 
address range to provide IP addresses to the internal network. Typically 
in the 192.168.x.x range, although there are others. Simply put traffic 
originating on the internet with these IP addresses are not routed. Your 
Router / Firewall usually changes the internal IP addresses to routable 
addresses, and then forwards on. This is NAT or Network Address 
translation.

Chris, I suspect the IPV4 IP Address you are seeing is the IP Address 
typically assigned to a network port by Win 7 when it cannot get an IP 
address. Typically in the range 169.254.x.x Incidentally, Win2000,XP and 
Vista all do this.

There is a fix for this problem, see Microsoft technet, but I would also 
consider your network set up in general, before mucking about with 
registry settings etc, unless of course you know what you are doing.

Finally, consider your PC firewall settings for Networking PC's for 
logging.

Hope this is of assistance.

73

Adrian MW1LCR / GW9X

PS I thought cluster connections for SSB FD had to be made via an 
amateur bands connection, say 144 or 432 etc? Have I got that wrong?

On 21/08/2012 10:52, Chris G3SJJ wrote:
> Thanks Stewart. That is just the setup I was trying to achieve! We have used a Cat 5 ethernet cable between two laptops without a Cluster connection
> successfully for several years but last year we had a WiFi connection available. We found there was a conflict and could have PC to PC network or
> Cluster but not both. This is why I was trying to go via the home BT Router for now to establish what was and wasn't feasible!
>
> Thanks also Adrian. I have gone back to the Cat 5 setup for now but I no longer have radio Cluster system. I had to use 2m in the early days of
> Cluster but have never ben interested in anything to do with VHF!
>
> Also , also! Thanks to Robert M0VFC who is working with me to try and resolve the weird IP addresses on the Samsung Windows 7 laptop. What is puzzling
> us is that the IPv4 address which would normally be assigned automatically as a 192. etc address shows a Public IP address, which is why I suspected
> it was using IPv6.
>
> Chris G3SJJ
>
>
> On 21/08/2012 08:52, Stewart Rolfe wrote:
>> I tried to configure a 2 radio/pc set up for IOTA with cluster access via telnet on the 'master' and crossed ethernet between the 2 computers. That didn't work and *would* require a router; the local networking got screwed up and the master network number would be reported as 17 which indicates that machine couldn't be found in the network table (and Qs made on that machine are therefore beyond the reach of editing etc). According to N2IC one of the N1MM coders, N1MM networking is not designed to be used with more than one network interface on any pc, and that was the problem. Solution is to use a router.
>> BTW, the ip addresses you describe indicate Internet Connection Sharing. As I understand it you *don't* manually allocate an address to the slave machine, the 192.168.0.1 master needs to do that automatically.
>> No computer expert, just my recent experiences.....
>> 73,Stewart, GW0ETF
>>
>> --- On Mon, 20/8/12, UKCONTEST <ukcontest at btconnect.com> wrote:
>>
>> From: UKCONTEST <ukcontest at btconnect.com>
>> Subject: Re: [UK-CONTEST] N1MM and IPv6
>> To: uk-contest at contesting.com
>> Date: Monday, 20 August, 2012, 22:52
>>
>> For SSB FD you don't need a router.
>>
>> Set Laptop 1 as 192.168.0.1 Subnet as 255.255.255.0 and Gateway as
>> 192.168.0.1  (this will be your gateway device). Laptop 2 as 192.168.0.2
>> , Subnet as 255.255.255.0 gateway as 192.168.0.1
>>
>> Then set up your amateur bands cluster connection via laptop 1 (ie your
>> 144MHz DX Cluster connection).
>>
>> As you are connecting via a private network, and your only connection to
>> the outside world is a DX Cluster via Radio you can disable the laptop
>> firewalls for the duration of the contest, making network connectivity
>> for N1MM easier to configure.
>>
>> A simple crossover CAT5(e) cable (for older laptops) or a conventional
>> CAT5(e) cable for modern laptops will suffice (they will usually auto
>> sense this type of connection) therefore doing away with hubs and
>> routers and other clutter around the tent.
>>
>> 73
>>
>> Adrian MW1LCR
>>
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>>
>
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