Firewall

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Firewall

  1. 1. o o o o o o Nosstateful
  2. 2. Stateful DMZ Proxy
  3. 3. download 1 Firewall
  4. 4. 5 DEC 8 AT&T Bell Laboratories . . SEAL "SEAL" Cisco 2 Packet Filtering Firewalls Cisco 4 Jeff Mogul 5 Digital Equipment Corporation 6 Dave Presetto 7 Howard Trickey 3 8 9 circuit level firewalls Bill Cheswick 11 Marcus Ranum 12 Gene Spafford 13 Application Layer Firewalls 14 Proxy-Based Firewalls 15 Bob Braden 16 Annette DeSchlon 17 Visas 18 Visual Integration 19 Check Point Software 20 Scott Wiegel 21 Global Internet Software Group 22 Kernel Proxy architecture 10 DEC
  5. 5. " " . . 23 fireWall
  6. 6. URL
  7. 7. - DsL patch
  8. 8. 24 Packet Filtering
  9. 9. mini Computer DVD CD
  10. 10. E-mail Trojan E-mail Worms Worm 25 E-mail Worms Simple Mail Transfer Protocol 26 26 SMTP
  11. 11. Dial up upgrade upgrade un-install memory CPU
  12. 12. dialup TCP TCP TCP 27 No Interface Circuit-LeveL 28
  13. 13. Nosstateful packet IP
  14. 14. Stateful Packet UDP TCP TCP FTP Stateful TCP TCP HTTP PC
  15. 15. DMZ DMZ
  16. 16. : IP IP IP IP : , ,,. 64 16 236 52 IP IP . IP IP 69,254,15,25 www . . goole com . browser http : 29 domain names 30 client 31 server
  17. 17. 32 IP TCP . 34 HTTP UDP FTP ICMP . SMTP SNMP FTP . " x-rated " " x-rated " rated " x " 32 Internet Protocol Transmission Control Protocol 34 Hyper Text Transfer Protocol 35 User Datagram Protocol 36 File Transfer Protocol 37 Internet Control Message Protocol 38 Simple mail transport protocol 39 Simple Network Management protocol 33 ( ) FTP ( HTTP )
  18. 18. LAN resource . . IP TCP : 40 40 Accept Mode Blocking Mode 41
  19. 19. 42 . . TCP/IP header : FTP Telnet Telnet header header IP : IP . IP IP . 42 Response Mode Identifier & Fragment Offset 43
  20. 20. . . 44 IP . IP . : header : ftp TCP ftp Telnet . . : 46 : TCP 44 Pocket Filtering Router Acknowledgment 46 TCP code Bits 45 SYN=1
  21. 21. TCP " " TCP . . : . . header TCP
  22. 22. : . (backdoor) . e-mail e-mail SMTP e-mail e-mail . backdoor . . . . e - mail . 47 e -mail e-mail Remote Login Application Backdoor 49 SMTP session hijacking 50 spam 51 Operating system bugs 52 Denial of service 48 e-mail E- mail
  23. 23. . . . . backdoor cookie ICMP . e-mail . . 53 Macros Spam 55 Redirect bombs 56 Source routing 54 e-mail e-mail
  24. 24. . . DMZ Proxy proxy . . : online FTP - 57 DMZ DMZ . DMZ DMZ DMZ 57 Demilitarized Zone gateway
  25. 25. NAT
  26. 26. ZonAlram pro 2008 ZoneAlarm Shield Pro FireWall 2008 repair Hauri inbox Prisma FireWall TCP Panda . . .
  27. 27. URL . proxy proxy http . free proxy
  28. 28. : www.homenethelp.com/web/ howto/free-firewall.asp http://www.all-internet-security.com/top_10_firewall_software.html http://networking.anandsoft.com/ad vantages-of-hardware-firewalls.html http://www.faqs.org/qa/qa-4838.html http://www.smallbusinesscomputing.c om/webmaster/article.php/3103431 http://personal-firewall-software-review.t optenreviews.com/hardware-firewalls-vssoftware-firewalls.html http://www.webopedia.com/didyouknow/hardwaresoftware/2004/firewall_types.asp http://www.evaluateit.co.uk/small_business/firewalls.html http://cms-london.com/ articletext.php?id=105 http://www.srco.ir/Articles/TipsView.asp?ID=254 http://www.alliancedatacom.com/firewall-tutorial.htm http://www.npc-rt.ir/newsdetail-fa-20.html http://fa.wikipedia.org/wiki http://atalebi.com/articles/show.asp?ID=427 http://www.iran20.ir/view.asp?id=50005879719100001 http://forum.sohail2d.com/viewtopic.php?t=9183 http://www.iritn.com/?action=show&type=news&id=7216 http://www.microrayaneh.com/Articles/Internet/Firewall2.htm http://www.indstate.edu/ect/ECT680/fall03_papers/Pramod.pdf

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