Now days there are kinds of ways to connect the Arduino with LAN .

Arduino ENC28J60 Network Shield

A shield based on ENC28J60.
 

 
The Arduino ENC28J60 Network Shield can connect with Arduino directly and this module also adopt SPI interface, so we can connect with Arduino boards through Arduino IDC Shield :
 

 

 
Download and uncompress the EncEthernet.zip into your hardware libraries of Arduino setup catalog and name it as EncEthernet :
 

 

 
After reboot Arduino , find the WebServer example code in : File->Examples->EncEtherent :

 

 

According to your LAN different setting , generally only need to modify the IP address:
 
static uint8_t myip[4] = {192,168,0,15};

After setting MAC address and IP address in the code, then download the programmer code .
Then you can visit your Arduino by browser , now your Arduino  is a simple Web server：

 

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