Hi, Rechena.
The original is necessary.
My Ethernet folder [ch65381][ch65381][ch65381]
\Ethernet
Client.cpp
Client.h
Ethernet.cpp
Ethernet.h
EthernetDHCP.cpp
EthernetDHCP.h
Server.cpp
Server.h
Udp.cpp
Udp.h
\Ethernet\utility
EthernetDhcpUtil.c
EthernetDhcpUtil.h
socket.cpp
socket.h
w5100.cpp
w5100.h
MyTypes1.h
MyTypes2.h