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First of all you have to connect your mbed to a RJ45 jack. These instructions can be found here : Ethernet RJ45.
Precompiled version:
Program published 05 Aug 2010 by 
Donatien Garnier
This is essentially a tri-liner:
First include the header file:
#include "EthernetNetIf.h"
Instantiate the interface: If you are using DHCP:
EthernetNetIf eth;
Or if you want to set your own parameters:
EthernetNetIf eth( IpAddr(192,168,0,101), //IP Address IpAddr(255,255,255,0), //Network Mask IpAddr(192,168,0,1), //Gateway IpAddr(192,168,0,1) //DNS );
And set it up:
eth.setup();
That's it!
#include "EthernetNetIf.h"
Public Member Functions |
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| EthernetNetIf () | |
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Instantiates the Interface and register it against the stack, DHCP will be used.
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| EthernetNetIf ( IpAddr ip, IpAddr netmask, IpAddr gateway, IpAddr dns) | |
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Instantiates the Interface and register it against the stack, DHCP will not be used.
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| EthernetErr | setup (int timeout_ms=15000) |
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Brings the interface up.
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| IpAddr | getIp () const |
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Returns the IP of the interface once it's connected.
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This interface is built around the mbed's Ethernet class and the LwIP stack. For more information about LwIP, you can visit the project's development site or its Wiki.
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For our network, the default timeout of 15 seconds was too short when using DHCP. It needs to be around 30 seconds or more.
I suspect that is the case at many large organizations that lock down the network a bit for more security.
So if you get an error trying to get an IP address, try increasing the timeout a bit with eth.setup(30000);