Ethernet

Connecting to Erle-Brain 3 through Ethernet can also be done through the IP address the brain. Before powering up Erle-Brain 3, run in your computer:

ifconfig

and see in which local network are you connected. As an example, in my network, my IP address is 192.168.1.35:

en5: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
     options=23<RXCSUM,TXCSUM,TSO4>
     ether 00:23:55:2c:35:26
     inet6 fe80::223:55ff:fe2c:3526%en5 prefixlen 64 scopeid 0x7
     inet 192.168.1.35 netmask 0xffffff00 broadcast 192.168.1.255
     nd6 options=1<PERFORMNUD>
     media: autoselect (1000baseT <full-duplex,flow-control,energy-efficient-ethernet

The network interface we're connected to is en5 so assuming that Erle-Brain 3 is connected to the same router, it'll get an IP in the same subnet. We check the devices (note that we haven't yet pluged Erle-Brain 3):

$ nmap -sn 192.168.1.*

Starting Nmap 6.47 ( http://nmap.org ) at 2015-09-29 10:29 CEST
Nmap scan report for 192.168.1.1
Host is up (0.0011s latency).
Nmap scan report for 192.168.1.35
Host is up (0.00054s latency).
Nmap scan report for 192.168.1.38

And now power-up Erle-Brain 3, and execute again:

$ nmap -sn 192.168.1.*

Starting Nmap 6.47 ( http://nmap.org ) at 2015-09-29 10:29 CEST
Nmap scan report for 192.168.1.1
Host is up (0.0011s latency).
Nmap scan report for 192.168.1.35
Host is up (0.00054s latency).
Nmap scan report for 192.168.1.38
Nmap scan report for 192.168.1.45
Host is up (0.00054s latency).

Notice that now a new host appears, the number 45, that's Erle-Brain 3, so now just connect using ssh:

ssh erle@192.168.7.1.45

the password is holaerle.