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clockdiff
===
检测两台linux主机的时间差
## 说明
在ip报文的首部和ICMP报文的首部都可以放入时间戳数据。 **clockdiff** 程序正是使用时间戳来测算目的主机和本地主机的系统时间差。
```
：
-o1： ，
```
### 实例
```
PING www.ustc.edu.cn (202.38.64.9) 56(124) bytes of data.
64 bytes from 202.38.64.9: icmp_seq=1 ttl=62 time=0.823 ms
TS: lixi-desktop.local (210.45.74.25) 12522473 absolute
210.45.74.1 -251
local-gw.ustc.edu.cn (202.38.64.126) 248
202.38.64.9 -857514
Unrecorded hops: 3
--- www.ustc.edu.cn ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.823/0.823/0.823/0.000 ms
```
首先由上面的得出在RRT不大的时候， （ ） （ ） ：
```
..................................................
host=202.38.64.9 rtt=1(0)ms/1ms delta=-857517ms/-857517ms Wed Dec 17 11:28:30 2008
```
```
.
host=202.38.64.9 rtt=750(187)ms/0ms delta=-857517ms/-857517ms Wed Dec 17 11:28:35 2008
```
两种方法测试的都比较准确。
```
..................................................
host=gigagate1.Princeton.EDU rtt=307(21)ms/271ms delta=-5ms/-5ms Wed Dec 17 11:50:16 2008
```
上面是测试一个RTT较大的目的主机和本地主机的系统时间差。不过在使用clockdiff的时候， ，
