Shulou(Shulou.com)06/02 Report--

Purpose: tips for grabbing transmission packets: before executing the wget command, we should delete the corresponding entry of the router in the ARP cache so that we can observe how the ARP protocol works in the TCP/IP communication process. ARP: example of address decoding: arp-d 192.168.1.1tcpdump-s 2000-I eth0-ntX'(src 192.168.1.108) or (dst 192.168.1.108) or (arp) 'wget-- header= "Connection:close" http://www.baidu.com/-- 2012-07-03 00JV 5V12-http://www.baidu.com feature: generally containing proxy server Tcpdump generally contains two pairs of client and server communication (wget client and proxy server, proxy server and target server) packet classification description: 1. The proxy server accesses the DNS server to query the ip information corresponding to the domain name 2. The proxy server queries the ARP request of the router address and answers the 3.wget communication between the HTTP client (192.168.1.109) and the proxy server (192.168.1.108) 4. HTTP communication between proxy server and web server (119.75.218.77)

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