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B Solaris 常用命令及例子( 五 )

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TCP: Sequence number = 769864152
TCP: Acknowledgement number = 52297913
TCP: Data offset = 20 bytes
TCP: Flags = 0x10
TCP: 0... .... = No ECN congestion window reduced
TCP: .0.. .... = No ECN echo
TCP: ..0. .... = No urgent pointer
TCP: ...1 .... = Acknowledgement
TCP: .... 0... = No push
TCP: .... .0.. = No reset
TCP: .... ..0. = No Syn
TCP: .... ...0 = No Fin
TCP: Window = 17292
TCP: Checksum = 0x7b85
TCP: Urgent pointer = 0
TCP: No options
TCP:
TELNET: ----- TELNET: -----
TELNET:
TELNET: ""
TELNET:

ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 2 arrived at 1:43:41.42
ETHER: Packet size = 97 bytes
ETHER: Destination = 0:3:f:fd:6d:c,
ETHER: Source = 0:c:29:80:4c:a,
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: .... ..0. = not ECN capable transport
IP: .... ...0 = no ECN congestion experienced
IP: Total length = 83 bytes
IP: Identification = 50744
IP: Flags = 0x4
IP: .1.. .... = do not fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 60 seconds/hops
IP: Protocol = 6 (TCP)
IP: Header checksum = f717
IP: Source address = 192.168.0.3, solaris9
IP: Destination address = 192.168.0.1, 192.168.0.1
IP: No options
IP:
TCP: ----- TCP Header -----
TCP:
TCP: Source port = 23
TCP: Destination port = 3013
TCP: Sequence number = 52297913
TCP: Acknowledgement number = 769864152
TCP: Data offset = 20 bytes
TCP: Flags = 0x18
TCP: 0... .... = No ECN congestion window reduced
TCP: .0.. .... = No ECN echo
TCP: ..0. .... = No urgent pointer
TCP: ...1 .... = Acknowledgement
TCP: .... 1... = Push
TCP: .... .0.. = No reset
TCP: .... ..0. = No Syn
TCP: .... ...0 = No Fin
TCP: Window = 64240
TCP: Checksum = 0xd1f6
TCP: Urgent pointer = 0
TCP: No options
TCP:
TELNET: ----- TELNET: -----
TELNET:
TELNET: "Using device /dev/pcn0 (promiscuous mode)rn"
TELNET:

2 packets captured
#

# snoop host1 host2
host1 -> host2 ICMP Echo request
host2 -> host1 ICMP Echo reply
使用snoop實用程序判定系統間實際上傳送的什么信，判斷網絡暢通
# snoop -a dhcp

Snoop 的使用
Snoop 是Solaris 系統中自帶的工具，是一個用于顯示網絡通訊的程序，它
可捕獲IP 包并將其顯示或保存到指定文件. (限超級用戶使用snoop)
Snoop 可將捕獲的包以一行的形式加以總結或用多行加以詳細的描述(有
調用不同的參數-v -V來實現). 在總結方式下(-V ) , 將僅顯示最高層的相關協
議, 例如一個NFS 包將僅顯示NFS 信息, 其低層的RPC, UDP, IP, Ethernet 幀信息將不會顯示, 但是當加上相應的參數(-v ), 這些信息都能被顯示出來.
參數簡介：
[ -a ] # Listen to packets on audio
[ -d device ] # settable to le?, ie?, bf?, tr?
[ -s snaplen ] # Truncate packets
[ -c count ] # Quit after count packets
[ -P ] # Turn OFF promiscuous mode
[ -D ] # Report dropped packets
[ -S ] # Report packet size
[ -i file ] # Read previously captured packets
[ -o file ] # Capture packets in file
[ -n file ] # Load addr-to-name table from file
[ -N ] # Create addr-to-name table
[ -t r|a|d ] # Time: Relative, Absolute or Delta
[ -v ] # Verbose packet display
[ -V ] # Show all summary lines
[ -p first[,last] ] # Select packet(s) to display
[ -x offset[,length] ] # Hex dump from offset for length
[ -C ] # Print packet filter code
由于snoop 的使用非常靈活, 希望能通過下面一些例子的學習來其常見用法.
1. 監(jiān)聽所有以本機為源和目的的包并將其顯示出來.

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