Firewall
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Firewall
- o o o o o o Nosstateful
- Stateful DMZ Proxy
- download 1 Firewall
- 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
- " " . . 23 fireWall
- URL
- - DsL patch
- 24 Packet Filtering
- mini Computer DVD CD
- E-mail Trojan E-mail Worms Worm 25 E-mail Worms Simple Mail Transfer Protocol 26 26 SMTP
- Dial up upgrade upgrade un-install memory CPU
- dialup TCP TCP TCP 27 No Interface Circuit-LeveL 28
- Nosstateful packet IP
- Stateful Packet UDP TCP TCP FTP Stateful TCP TCP HTTP PC
- DMZ DMZ
- : 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
- 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 )
- LAN resource . . IP TCP : 40 40 Accept Mode Blocking Mode 41
- 42 . . TCP/IP header : FTP Telnet Telnet header header IP : IP . IP IP . 42 Response Mode Identifier & Fragment Offset 43
- . . 44 IP . IP . : header : ftp TCP ftp Telnet . . : 46 : TCP 44 Pocket Filtering Router Acknowledgment 46 TCP code Bits 45 SYN=1
- TCP " " TCP . . : . . header TCP
- : . (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
- . . . . backdoor cookie ICMP . e-mail . . 53 Macros Spam 55 Redirect bombs 56 Source routing 54 e-mail e-mail
- . . DMZ Proxy proxy . . : online FTP - 57 DMZ DMZ . DMZ DMZ DMZ 57 Demilitarized Zone gateway
- NAT
- ZonAlram pro 2008 ZoneAlarm Shield Pro FireWall 2008 repair Hauri inbox Prisma FireWall TCP Panda . . .
- URL . proxy proxy http . free proxy
- : 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