UDP: Length = 35
UDP: Checksum = 8E35
UDP:
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 2 arrived at 12:33:12.16
ETHER: Packet size = 69 bytes
ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast)
ETHER: Source = 0:4:76:46:8f:50,
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4
IP: Header length = 20 bytes
IP: Type of service = 0x00
IP: xxx. .... = 0 (precedence)
IP: ...0 .... = normal delay
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 55 bytes
IP: Identification = 14985
IP: Flags = 0x0
IP: .0.. .... = may fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 128 seconds/hops
IP: Protocol = 17 (UDP)
IP: Header checksum = ebf1
IP: Source address = 10.10.10.50, 10.10.10.50
- 5 -
IP: Destination address = 255.255.255.255, BROADCAST
IP: No options
IP:
UDP: ----- UDP Header -----
UDP:
UDP: Source port = 2541
UDP: Destination port = 177
UDP: Length = 35
UDP: Checksum = 8E35
UDP:
11.监听任何的NTP 协议包
# snoop |grep – i NTP
Using device /dev/hme (promiscuous mode)
ts1 -> 224.0.1.1 NTP broadcast (Tue Jul 23 12:48:50 2002)
ts1 -> 224.0.1.1 NTP broadcast (Tue Jul 23 12:49:54 2002)
ts1 -> 224.0.1.1 NTP broadcast (Tue Jul 23 12:50:58 2002)
ts1 -> 224.0.1.1 NTP broadcast (Tue Jul 23 12:52:02 2002)
ts1 -> 224.0.1.1 NTP broadcast (Tue Jul 23 12:53:06 2002)
ts1 -> 224.0.1.1 NTP broadcast (Tue Jul 23 12:54:10 2002)
这里我们也可看到NTP server 每隔约一分钟即向多播地址广播一次.
| sunmarmot 回复于:2003-10-30 13:01:52 |
| 很经典的东东,帮您顶一下,偶刚准备写一点 |
| solstice 回复于:2003-10-30 13:14:16 |
| 先顶,再收藏,呵呵
大老鼠,您也来北京了! 有空聚聚吧! |
| sunmarmot 回复于:2003-10-30 13:35:57 |
您D意思是要请偶吃饭?? ![]() |
| forliving 回复于:2003-10-30 13:59:40 |
| 好内容收藏。 |
| 胶皮糖 回复于:2003-10-30 20:19:15 |
| 好东东,顶上去,让大家看 |
文章整理:西部数码--专业提供域名注册、虚拟主机服务
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