内网问题

问题描述：

这是一台经常断线上不了网的计算机上的PING,该机曾查过毒,没发现病毒!

C:\Documents and Settings\Administrator>ping www.sina.com.cn -t
Pinging ara.sina.com.cn [58.63.236.36] with 32 bytes of data:
Reply from 58.63.236.36: bytes=32 time=180ms TTL=56
Reply from 58.63.236.36: bytes=32 time=17ms TTL=56
Reply from 58.63.236.36: bytes=32 time=433ms TTL=56
Reply from 58.63.236.36: bytes=32 time=556ms TTL=56
Reply from 58.63.236.36: bytes=32 time=1168ms TTL=56
Reply from 58.63.236.36: bytes=32 time=20ms TTL=56
Reply from 58.63.236.36: bytes=32 time=15ms TTL=56
Reply from 58.63.236.36: bytes=32 time=42ms TTL=56
Reply from 58.63.236.36: bytes=32 time=16ms TTL=56
Reply from 58.63.236.36: bytes=32 time=37ms TTL=56
Reply from 58.63.236.36: bytes=32 time=18ms TTL=56
Reply from 58.63.236.36: bytes=32 time=647ms TTL=56
Reply from 58.63.236.36: bytes=32 time=629ms TTL=56
Reply from 58.63.236.36: bytes=32 time=468ms TTL=56
Reply from 58.63.236.36: bytes=32 time=413ms TTL=56
Reply from 58.63.236.36: bytes=32 time=313ms TTL=56
Reply from 58.63.236.36: bytes=32 time=20ms TTL=56
Reply from 58.63.236.36: bytes=32 time=25ms TTL=56
Reply from 58.63.236.36: bytes=32 time=176ms TTL=56
Reply from 58.63.236.36: bytes=32 time=412ms TTL=56
Reply from 58.63.236.36: bytes=32 time=310ms TTL=56
\Reply from 58.63.236.36: bytes=32 time=14ms TTL=56
Reply from 58.63.236.36: bytes=32 time=18ms TTL=56
\Reply from 58.63.236.36: bytes=32 time=617ms TTL=56
Reply from 58.63.236.36: bytes=32 time=474ms TTL=56
Reply from 58.63.236.36: bytes=32 time=16ms TTL=56
Reply from 58.63.236.36: bytes=32 time=17ms TTL=56
Reply from 58.63.236.36: bytes=32 time=16ms TTL=56
Reply from 58.63.236.36: bytes=32 time=218ms TTL=56
Reply from 58.63.236.36: bytes=32 time=705ms TTL=56
Reply from 58.63.236.36: bytes=32 time=674ms TTL=56
Reply from 58.63.236.36: bytes=32 time=16ms TTL=56
Reply from 58.63.236.36: bytes=32 time=817ms TTL=56
有时候time=2000多ms,该机作为闭路监控主机,端口映射为:5050 80 5051 5052 6789 5040 7050 .经常断线是什么问题?其他机不怕断线!
如果被内网其他机攻击的话,该怎样查!或者可以用什么软件监视!

问题解答：

把路由多余功能关掉
什么功能都不要开