中国钟学我术大草 信息网倍与协议 VERIITY OF SCIENCE AND TECHNOLOOY O年C框NA Direction Fields Old Values New Values Out 源P地址：协议：源端口号 10.0.0.3:TCP:2000 202.38.75.11:TCP:2000 In 目的P地址：协议：目的端口号202.38.75.11：TCP:2000 10.0.0.3:TCP:2000 Internet Web server 10.0.0.1 <10.0.0.3,2000>map to <202.38.75.11,2000> 10.0.0.254 202.38.75.11 10.0.0.2 Connection request from'c'forwarded to <web server>source 202.38.75.11,port 2000. 10.0.0.3 Connection request to port 80 from'c'to <web server>source 10.0.0.3,port 2000.信息网络与协议 Internet 10.0.0.254 10.0.0.3 10.0.0.2 10.0.0.1 Web server a b c NAT 202.38.75.11 Connection request to port 80 from ‘c‘ to <web server> source 10.0.0.3, port 2000. <10.0.0.3, 2000> map to <202.38.75.11,2000> Connection request from ‘c’ forwarded to <web server> source 202.38.75.11, port 2000. Out 源IP地址：协议：源端口号 10.0.0.3:TCP:2000 202.38.75.11:TCP:2000 Direction Fields Old Values New Values In 目的IP地址：协议：目的端口号202.38.75.11:TCP:2000 10.0.0.3:TCP:2000