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DJ7DA
Joined: 03 May 2006 Posts: 83 Location: Bavaria
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Posted: Mon Sep 12, 2011 11:02 am Post subject: |
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Hello Paul,
thanks for your dedication and patience.
Slowly I seem (!!) to understand the scheme(s) you have in mind. I doubt though, whether we will be entering that type of enterprise.
As you know we are perfectly able to remotely control our ATV-repeater in all respects and reliably at that. What I had in mind, was to check whether a control also would be possible via the Net without having a local wire connection. This - no doubt anymore - seems to be feasible.
There are some other (and new) aspects arising now. However, in a forum like this I don't want to bore people with the subtleties of Ham Radio.
Why not continue via eMail. You can reach me under "xxxxx".
Best regards
Ernst
Last edited by DJ7DA on Tue Sep 13, 2011 11:10 am; edited 1 time in total |
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Paulvk
Joined: 28 Jul 2006 Posts: 1257 Location: SYDNEY
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Posted: Mon Sep 12, 2011 12:25 pm Post subject: |
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Have your e-mail ok edit it out now if you whish Ernst I am just waiting for my mail server to come back after some work being done on it and I have an e-mail wating to go. |
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JamesAus
Joined: 08 Aug 2007 Posts: 50 Location: Australia
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Posted: Mon Sep 12, 2011 1:31 pm Post subject: |
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Hi
This is a very interesting discussion. I have also come up against similar obstacles when setting up devices in remote locations here in Australia. Paul, you mention using a Dynamic DNS service, which sounds all well and good in theory but it doesn't work with a lot of APNs (eg tel$tra.internet). The IP address is NAT'd therefore completely inaccessible from outside the "LAN" that the service provider owns. I believe this is the problem the OP is facing. The dynamic DNS address will be directed to the public IP address. If no APN is available that gives the device a public IP address the only way it can work is by the end device initiating and maintaining a tunnel with a VPN server somewhere else. Is this what you are referring to? I am aware there are devices that do it but are very costly and the vendors like you to use their VPN with an associated subscription cost.
I've only ever had to worry about a single user accessing the end device, and there are relatively inexpensive serial device servers that have a dynamic DNS client built in for this very purpose..BUT...you need to use an APN that gives you a public IP address. Tel$tra here does have one (tel$tra.extranet) but it's difficult to find anyone in the organisation that knows about it or is willing to enable it for your SIM.
Regards
James |
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DJ7DA
Joined: 03 May 2006 Posts: 83 Location: Bavaria
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Posted: Tue Sep 13, 2011 12:24 pm Post subject: |
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Hi James, you hit the point.
No one of the many German providers allows access to a UMTS-stick/LAN from the net. A VPN tunnel is the only way to access the remote LAN and - as you said - the initiation has to come from there.
Regards
Ernst |
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Paulvk
Joined: 28 Jul 2006 Posts: 1257 Location: SYDNEY
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Posted: Wed Sep 14, 2011 10:44 am Post subject: |
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DJ7DA wrote: | Hi James, you hit the point.
No one of the many German providers allows access to a UMTS-stick/LAN from the net. A VPN tunnel is the only way to access the remote LAN and - as you said - the initiation has to come from there.
Regards
Ernst |
Yes and thats where Monowall or a router with the VPN server built in can dial out to link to another server on the internet the only thing is how much data you can get on your plan as it will try to keep the tunnel open. |
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DJ7DA
Joined: 03 May 2006 Posts: 83 Location: Bavaria
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Posted: Wed Sep 14, 2011 2:15 pm Post subject: |
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Yes Paul, that's what I understand.
As to the data I'm not worried, although my "plan" allows for only 500MB per month at "full speed" (whatever that means) and from there on unlimited data volume at 64 kB/s (GPRS speed). Both limitations are irrelevant in my application: the daily data volume is 5 MB max and we could even live with the low speed because the data going to and from the unit are very slow. Typically a "burst" of data amounts to about 100 bytes (in either direction).
However, if keeping the dialed connection open consumes a significant data volume, we might run into the "slow" mode earlier. But again, that would not bother us.
Thanks
Ernst |
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Paulvk
Joined: 28 Jul 2006 Posts: 1257 Location: SYDNEY
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