Default network configuration
From embeddedTS Manuals
All of our boards come up with a static IP of '192.168.0.50/255.255.255.0' on at least one of the ethernet ports. This is so that if you do not have serial available you can still connect to the board. Serial is still the recommended method though since telnet and ssh will not show you the startup output.
The default login will be 'root' with no password. You should set one so that ssh will be available.
Windows
Plug an ethernet cable in between your workstation and the board. Set your system to a static ip address of 192.168.0.51.
Open up a cmd.exe prompt and run
telnet 192.168.0.50
Linux
Plug an ethernet cable in between your workstation and the board. and run:
ifconfig eth0 192.168.0.51
telnet 192.168.0.50