Finding network interface MAC address

The MAC address of a specific network interface (wired, wifi) may be needed, eg on sites where one wants to assign the device a static IP address.

The MAC addresses of the (wired) ethernet ports are on stickers on the connectors inside the box - on the embedded PC board.

Alternatively, you can list them if you log in to the observatory system using ssh, the command is "ip a" or "ifconfig", without parameter lists all interfaces, or you can specify an interface like eth1. That hat includes wifi interface wlan0. below is an example for DFNSMALL009, with the relevant information in bold face.

Note: this observatory is connected to the Internet using mobile network (ppp0), therefore the WAN ethernet interface has no IP address assigned, as it not connected to anytrhing.

root@DFNEXT009:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
   inet 127.0.0.1/8 scope host lo
      valid_lft forever preferred_lft forever
   inet6 ::1/128 scope host
      valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
   link/ether 00:03:1d:11:30:f4 brd ff:ff:ff:ff:ff:ff
   inet 172.16.1.101/24 brd 172.16.1.255 scope global eth0
      valid_lft forever preferred_lft forever
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
   link/ether 00:03:1d:11:30:f3 brd ff:ff:ff:ff:ff:ff
4: wwan0: <BROADCAST,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
   link/ether 72:4b:06:a6:01:07 brd ff:ff:ff:ff:ff:ff
5: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
   link/ether 18:d6:c7:10:29:5f brd ff:ff:ff:ff:ff:ff
   inet 172.16.0.101/24 brd 172.16.0.255 scope global wlan0
      valid_lft forever preferred_lft forever
   inet6 fe80::1ad6:c7ff:fe10:295f/64 scope link
      valid_lft forever preferred_lft forever
6: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 3
   link/ppp
   inet 10.113.20.244 peer 10.64.64.64/32 scope global ppp0
      valid_lft forever preferred_lft forever
7: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 100
   link/none
   inet 10.1.23.9 peer 10.1.24.9/32 scope global tun0
      valid_lft forever preferred_lft forever
   inet6 fe80::b3b7:c886:84ea:448/64 scope link flags 800
      valid_lft forever preferred_lft forever