WHAT IS ACCESS CONTROL LIST

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ACCESS CONTROL LIST

WHAT IS ACCESS CONTROL LIST (ACL)?

  • ACL is a set of rules which will allow or deny the specific task.
  • It is a layer 3 security which controls the flow of traffic from one router to another.
  • It is also called as Packet Filtering Firewall.
DIFFERENCE BETWEENS STANDARD ACCESS LIST AND EXTENDED ACCESS LISTACCESS CONTROL LIST
  • STANDARD ACL COMMANDS–
  1. In config mode.
  2. Acesss list 1-99 (Any number).deny source IP (192.168.1.3) 0.0.0.0 (Specific host IP address ).
  3. Acess list permit 0.0.0.0 255.255.255.255 .
  4. Interface g0/0.
  5. IP Acess group 1 out.
  6. Show access list.
  7. no access-list.

 

  • EXTENDED ACL COMMANDS–
  1. come on source router.
  2. access-list 100 deny IP host 192.168.2.3 host 192.168.3.3
  3. access-list 101 deny IP 192.168.1.3 0.0.0.0 192.168.3.3 0.0.0.0
BLOCK USER USING WILD CARD MASK—
  1. access-list 100 permit IP any any
  2. access-list 101 permit IP any any
  3. interface g0/0
  4. IP access-group 100 in
  5. interface g0/1
  6. IP access-group 101 in.
  7. exit
BLOCKING NETWORK TO HOST–
  • config(#) access-list 101 deny IP 192.168.2.0 0.0.0.255 host 192.168.3.3
  •          (#)access-list 120 permit IP any, any
  •          (#)interface g0/1
  •          (#)IP access-group 120 in
BLOCK ONLY PING–
  • config(#) access-list 104 deny IP host 192.168.2.3 host 192.168.3.3
  •          (#)access-list 104 IP any, any
  • config(#)interface g0/1
  •           (#)IP access-group 104 in

 

PERMIT THE ONLY PING AND DENY ALL OTHER—
  • config(#)access-list 105 deny TCP host 192.168.2.3 host 192.168.3.3
  •           (#)access-list 105 deny UDP host 192.168.2.3 host 192.168.3.3
  •           (#)access-list 105 permit ICMP any, any

 

 

 

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