协议&端口号

协议号 
IP 0 
ICMP 1
TCP 6
UDP 17  
IPv6 41
IPv6-route 43
GRE 47
ESP 50
AH 51
IPv6-icmp 58
EIGRP 88
OSPF 89

端口号
ftp-data 20 tcp File Transfer [Default Data] (tcp 20为ftp数据端口)
ftp 21 tcp File Transfer [Control] (tcp 21为ftp控制端口 )
   
ssh 22 tcp The Secure Shell (SSH)
telnet 23 tcp Telnet
smtp 25 udp Simple Mail Transfer (tcp 25端口 用于发邮件)

dns 53 udp Domain Name Server (udp53为dns控制端口)
dns 53 tcp Domain Name Server (tcp53为dns传输端口)
(dns 在udp协议之上 ，可理解为tcp53为dns传输端口 )

pop3 110 tcp Post Office Protocol Version 3 (tcp 110端口用于收邮件)
tftp 69 udp Trivial File Transfer
ms-wbt-server 3389 tcp MS WBT Server (window 远程桌面)
                                             Windows-Based Terminal
Packet Format
UDP
       Source Port Destination Port
TCP
       Source Port Destination Port
       Sequence Num ACK