FIRE WALLS

1
?? ??? ???
www.SoftGozar.Com
????? ????
FIRE WALLS
2
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www.SoftGozar.Com

• ?????? ?? ????? ?????? ?? ???? ????? ?? ????? ???
• ?? ??????? ?????????????? ?? ??????? ??? ?? ???

3
www.SoftGozar.Com
???? FIREWALL?? ???????? ????? ????? ????????
????? ????? ?? ?? ???? ????????? ?? ????????????
?? ????? ??? ???? ??????? ?? ??? ?????.
4
???????? ???? ?? ??? ???? ????? ??? ????? ?????
?????? ?? ???????????? ????? ?? ???? ????? ??????
???? ?????? ???????????? ???? ?? ?????? ??? ????
??? ????????? ????.
www.SoftGozar.Com
5
??????? ?? ???? ????? ?????
www.SoftGozar.Com

• ??????? ??????? ?? ?????? ??? ?????? ???????? ???
• ??????? ????????????? ????? ?????? ??????????
• ?????? ? ??????? ???? ???????? ?? ??? ????? ??
  ???? ????? ???? ?????? ??????? ?????????? ????
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• ??????? ??????????? ??? ?????? ???????? ????
  ??????????????? ???? ?...??????
• ??????? ??????? ?????? ?????? ????????????

6
Fire wall ????? ??? ?? ???
www.SoftGozar.Com

• ????? ???? ??? ?????? ???? fire wall ????????
• ?? firewall??????? ?? ?? ?????? ????? ??????
• ??????????? ???????? ?????? ???? ?????? ?????
  ????
• ?? ?????? ??????? ??? ???????? ??????? fire wall
  ??? ???

7
??????? ?? ???? ????? ?????????? ???.
www.SoftGozar.Com

• FIRE WALL
• ??? ????? ?? ????????? ?? ?????? ?? ???? ??????
  ?????? ???? ?? ?????????? ?????.

8
Fire wall ????? ??????????? ???? ?????? ?????.
www.SoftGozar.Com

• Remote loging????? ????????????? ???
• Spam ????????? ?? ??????? ?? ???? ????
• Email bomb????? ??????? ???????? ?? ???
  ??????????? ????
• Virus ????? ???? ?? ???? ?????? ?????
• Denial of service????? ?????? ???? ?? ???? ??
  ???? ???????????? ???????? ????? ?? ???? ?? ???

9
????? ???? ??? ???????
www.SoftGozar.Com
????? ???? ???? ?? ?? ??????? ???? ????? ???????
??? ???
??????? ?????? ??? ?? ???????? ? ????? ???? ?? ??
??????
??????? ?????? ???????? ?? ???????? ????? ?? ????
?????? ???? ?? ???? ???? ???? ??????.
10
??? ??? ????? fire wall

1. ????????? ??? ????? PACKET FILTERING
2. ????????? ??? ???????? ????? ????? ????
   ????STATEFUL (DYNAMIC)PACKET INSPECTION
3. ????????? ??? ?????APPLICATION PROXY
4. (GATWAY)
5. ?????????? NAT
6. ????????? ??? ????

www.SoftGozar.Com
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????????? ??? ????? PACKET FILTERING

• ????? ??? ???????
• ????? ??????? ???? ??????? ???? ?? ???? ?? ??? ??
  ?????? ????????

????????? ?? ?????? ??????? ?? ??????
?????? ?????-?????? ????? ?????? ????? ??????????? ?????? ???? ???????? ???? ?????
???????? ??-???? ?????? ???????????? ???? ????? ????? ??-????? ???? ?????
www.SoftGozar.Com
12
????? ??????????????? ??? (LOW LEVEL)
????????? ????????????????? ????????????
?????????? ????? ????? ?????? ????? ????? ?????
???? ?? ?????? ?????????? ?????????? ??????
www.SoftGozar.Com
13
????????? ??? ???????? ????? ????? ??????? ????
?? ?? STATEFUL (DYNAMIC)PACKET INSPECTION

• ???????? ?????? STATELES????? ??????? ???
• STATEFUL ????? CONTEXT CONTENT

????? ??? ????? IP ???? ?? ??????? ?? ??? ?????
???????? ??? ???? ????? ??????
www.SoftGozar.Com
14
????????? ??? ?????APPLICATION PROXY (GATWAY)

• ?????? ????? ?? ???? ???? ???
• ???? ???? CLIENT/SERVER ?????? ?????

????? ?? APPLICATION ???? ?? ????? ?? ??????
?????????? ??????? ?????? ????? ????????? ????
???? APPLICATION ???? ?? ????
www.SoftGozar.Com
15
?????????? NAT

• ?? ???? ??? ??????? ????
• ?? ???????? ???? ?? ???? ???? ?? ??????? ??? ??
  ???? ???? ???? ??????VALID???????? ???????? ?????
  ????? ??? ???.

www.SoftGozar.Com
16
????????? ??? ???? PERSONAL FIREWALL

• ???? ?????? ??????? ??? ???? ?DESKTOP
• ??? ???
• ??????? ??? 1?2
• ??????? ?? ????( LEARNING MODE)

www.SoftGozar.Com
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ZONE ALARM
www.SoftGozar.Com
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www.SoftGozar.Com
??????? ??????? ?????? ?? ?? ????? ????? ???
???? ?????? ???? ???????????? ??????.
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