1. TCP ( ) 2012-02-15

2. 192.168.3.1 192.168.3.2 ... 3. OSI 7Layer BSD (Berkeley Software Distribution) 4. MAC ADDRESS CSMA/CD( ) 5. 6 MAC ADDRESS ? MAC ADDRESS ? 6. struct ethhdr{ unsigned char h_dest[6];MAC unsigned char h_source[6];( ) MAC unsigned short h_proto; (IV4, IP6, ARP, ICMP.. ) }; =>14 7. www.wireshark.org ? 8. .. TCP, UDP SmartSniff 9. .. http://www.winpcap.org/ ETRI ... Winpcap 10. ????? BC-5F-F4-1B-09-25 192.168.3.1 192.168.3.2 .. 11. IP (Internet Protocol) IP Address .. IP 12. IP Fragmentation (reassemble) Identification MTU(Maximum Transfer Unit) . MTU ? 13. ... 14. ????? BC-5F-F4-1B-09-25 192.168.3.1 192.168.3.2 .. 15. ARP(Address Resolution Protocol) IP Address MAC Address Protocol 192.168.3.2 ? 16. ARP Cache PC ? 17. ICMP(Internet Control Message Protocol) ICMP Message Error reporting Query 18. ICMP Ping Ip 19. 192.168.3.2 BC-5F-F4-1B-09-25 192.168.3.1 , PC . , , IP .. 20. MSN ? 21. MSNMS 22. MSN