Mesh networking on OpenWRT 15.05 with OLSR
This guide covers configuration of OpenWRT to create a mesh network based on OLSR.
Access with command like via ssh is required. Use Putty or any other terminal.
OpenWRT 15.05 Chaos Calmer is installed with defaults. Target device has 8Mb flash memory minimum.
This will work on EmonWRT3 and ModWRT devices.
If using WR703N router it must be modified with upgraded flash memory. The default unit does not have sufficient memory.
Setup a Node
This is for setting up a simple node that has no direct access to the outside www but can connect to other nodes. Most unit in the network will have this configuration.
We will use here
- Wired - Static IP 192.168.2.1 (for configuration access only)
- Wifi - Ad-hoc wifi with Static IP 10.10.10.xx (for comms with other nodes).
-1- Install packages
Install the required packages with the command below:
opkg update opkg install luci-app-olsr luci-app-olsr-services luci-app-olsr-viz luci-lib-json opkg install olsrd olsrd-mod-arprefresh olsrd-mod-bmf olsrd-mod-dot-draw olsrd-mod-dyn-gw olsrd-mod-dyn-gw-plain olsrd-mod-httpinfo olsrd-mod-mdns opkg install olsrd-mod-nameservice olsrd-mod-p2pd olsrd-mod-pgraph olsrd-mod-secure olsrd-mod-txtinfo olsrd-mod-watchdog olsrd-mod-quagga opkg install wireless-tools
-2- Setup Wired LAN
Make sure the wired interface LAN is setup with static IP address. For our example we will use 192.168.2.1 (if you opt for another ip address then avoid the internet access subnet - like 192.168.1.0 for home routers.)
Make sure the interface is not bridging the wifi.
- Go to Network | Interfaces click on Edit on the LAN interfaces. Then in Physical Settings untick create a bridge over specified interface(s).
- Make sure Ethernet Adapter: "eth0" (lan) is ticked on.
You should now configure this unit by connecting a computer directly to this node with an ethernet cable.
-3- Setup wifi mesh interface
Go to Network | Wifi click on Edit on the only wifi interface that should be there.
Find Interface Configuration at the bottom of the page and setup the following:
Note: ESSID must be the same on all nodes.
Network: untick lan tick create and enter 'mesh'
If the wifi interface is disabled enable it clicking on Enable.
Go to Network | Interfaces click on Edit on the interface MESH.
Setup these parameters below:
Protocol: Static address (click the Switch Protocol button now).
IPv4 address: 10.10.10.2
Set IPv4 address above as 10.10.10.x with x being the number of your node. 2 in our example here.
IPv4 netmask: 255.255.255.0
Use custom DNS servers: 22.214.171.124
-4- Setup Firewall
-5- Setup OLSR
Go to Status | OLSR The page will show the number of interfaces and neighbours.
The OLSR-Viz tab provide a nice graphical visualisation of the full network.
Setup the Gateway - Node with internet access
Setup the device as a normal node as described above.
Go to Network | Interfaces.
Click on Edit for LAN.
Change Protocol to DHCP client. Click Switch Protocol now.
In Hostname to send when requesting DHCP enter MESH01 (or anything that you prefer). click
You should now connect this unit to your office router. You can acccess web interface and ssh using hostname as MESH01.
Go to Network | Firewall
In General Settings change Forward as accept.
Find Zones at the bottom of the page.
Click on Edit for lan.
Tick on Masquerading.
Tick on MSS clamping.
Find the Inter-Zone Forwarding at the bottom of the page.
Tick on all Allow forward to destination entries.
Remove and install packages as below:
opkg remove wpad-mini opkg update opkg install wpad authsae
Now run these commands below to setup the encryption:
uci set wireless.@wifi-iface.encryption='psk2/aes' uci set wireless.@wifi-iface.key='password'
Replace password with anything you prefer.
Reboot the device and apply the same to all units with same password.