Forth Estuary Experimental Data Network

Network Map
Status 2 day
Status 30 day
Technical Info
Contact Information
Feednet Services


Downloadable PI Image


Most of what can be achieved via FEEDNET is courtesy of open source software. The sheer hard work, altruism and inventiveness of all open source authors is gratefully acknowledged here.




VLAN layouts and related information.


Ubiquiti VLAN info for Broadband Hamnet

Since the Ubiquiti line of devices has only 1 Ethernet port, the standalone device only supports one wired-LAN connection.  If you want additional LAN connections, then you will need to add an outboard Ethernet Switch.  If you need the WAN network, then you will require an outboard Ethernet Switch which supports 802.1q VLANs (virtual LANs).  Configure the VLANs as follows:

  • Untagged = LAN

  • vlan1 = WAN

  • vlan2 = DTDLINKING (device-to-device linking)


DTD Linking on Linksys

When ports on the Linksys are being used in both a tagged and untagged mode some Realtek based devices have issues maintaining an ethernet connection to the switch. In 3.0.0 DTDLINK is disabled by default in order to alleviate these issues as most Linksys nodes will not likely be part of a DTDLINK network.


Enabling DTDLINK on all interfaces means that Realtek devices may not be able to connect to your node. If your Laptop/Computer? network card is Realtek based you may not be able to access your node again without the help of additional hardware.

Required Skill

You should be comfortable editing files from a shell session. If you are not please seek a someone knowledgeable who can do this for you, or consider investing in Ubiquiti gear which works out of the box.


SSH into the node at localnode on port 2222

Use vi to edit /etc/vlan

Once inside the file you will see a line similar to option vlan0 “1 2 3 4 5t” take note of the numbers on that line add a new line (under option vlan1) that is option vlan2 “1t 2t 3t 4t 5t” where you are using the same numbers as shown in the vlan0 line but with a 't' after each number (means the port is tagged). Depending on make and model of Linksys device you have the numbers may be different, use the numbers as you see in your vlan0 line. You probably only want to use some of the numbers if you want only select ports to be available for DTDLINK so you can keep ports available that will work with Realtek devices.

Save the vlan file

Edit /etc/config.mesh/network

Delete the line “option auto no” under dtdlink or put a # at the start of the line to enable the dtdlink interface.

Save the file Open your web browser and navigate to the node at ​http://localnode:8080/

Navigate to the System page Save the configuration Reboot your node

Device to Device linking will now be available on your node.


Reversal can be done by disabling the DTDLINK interface and removing the option vlan2 line, alternately you may just re-flash your node.






Home | Network Map | Status 2 day | Status 30 day | Emcomm | Technical Info | Contact Information | Streaming | Feednet Services | Gallery

Last updated: 02/26/16.