请教一下，日志里面老是显示：link

enjoyeric

请教一下，日志里面老是显示：
kernel: tg3: link is up at 100m
..... is at ox .....
link is down

kernel: tg3: link is up at 100m
..... is at ox .....
link is down

kernel: tg3: link is up at 100m
..... is at ox .....
link is down
老是一会up，一会down的，怎么办，一直上不了网，系统是fc6的