布泓也難

There is an easy way to turn-on telnet client instead of using other telnet client such as putty or teraterm. Got to control panel -> Select Turn Windows features on or off then you can turn the feature on.

Mostly, "warning: implicit declaration of function " tell you some header are not correctly include in you c code. By check man menu, it will tell you these tree headers are required.  #include <types.h>  #include <stat.h>  #include <fcntl.h> However, to fix the problem you have to add "#include <unistd.h >" to fix the problem.

Two useful tools can be use to check link in different speed. 1> mii-tool eth0: no autonegotiation, 100 baseTX-HD, link ok 2> ethtool eth0 ....