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TOPIC: Running DDC over VPN

Running DDC over VPN 26 Jan 2020 18:52 #1

  • davegte
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Has anyone done this, or knows if it is possible? :
Imagine a local site with a PC running the normal 'local' receive app NOT client/server, connected to a router that can act as a VPN server
Imagine a remote site with a DDC plugged into a router that can act as a VPN client.
In this way although the two ethernet networks are geographically separate they are on the same network as the VPN server router is running two IP networks, the local one and the VPN one.
Question: Can the DDC at the remote site work with the local receive app? i.e. the VPN effectively connects the app and DDC together over ethernet.
I do not know what bandwidth is taken up on the ethernet, but in my case the VPN bandwidth is 10 mbps. Is link latency a problem?

Any comments appreciated
Dave GW4GTE
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Running DDC over VPN 27 Jan 2020 21:48 #2

  • DL9NBJ
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Yes it can work. I have a WiFi route with 3 routers in between. It was not easy to set this up because the SundSDR2DX lacks important Ethernet settings. You can only set the ip address. Neither the possibility of specifying a gateway nor a subnet mask, as is normally the case with LAN devices. Therefore, it only works with a VPN tunnel, because otherwise the data flow goes to Nirvana. The VPN tunnel naturally requires valuable bandwidth.
vy 73 de Thilo DL9NBJ

Problems with my SunSDR2DX:

VOX - works only on 2m, not on HF
TUNE - does not work, reduces power when tuning if SWR is bad
Displayed supply voltage has incorrect values
Crosstalk betwen antenna ports A2 <-> A1
Solved: ... ;-(
Last Edit: 27 Jan 2020 21:48 by DL9NBJ.
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Running DDC over VPN 28 Jan 2020 20:27 #3

  • iw7dmh
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Hello Dave,
what you described is a widely used solution. It works well with the SunSDR rigs but you need a high speed network. Let's say 3 Mbit (or more) in upload.
In the picture below you can see how the bandwidth is related to the sampling rate you set on EESDR. It is for only one rx. When you add the second RX values ​​just double.

bandwidth.jpg


There are different ways to develope a VPN. One is described on my web page. It is free and it is based on opensource systems like OpenVPN and Raspberry PI3 but there are other solutions like make a subscription to a online VPN service. The last solution is not free but you have some time (usually the first month) to configure and test your network.

73' Enzo
Last Edit: 28 Jan 2020 20:30 by iw7dmh.
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