ACL(ACCESS CONTROL LIST)

List of conditions:-

TYPES:-
1-Standard:1-99
2-Extended:100-199

1-Standard
                  -Require source IP add.
                  -Apply on destination router.
                  -Out band List

2-Extended
                  -Require source IP & destination IP.
                  -Apply on source Router.
                  -Inbound List.


ICMP-Internet control Message Protocol


Router(config)#access-list 4 deny 30.0.0.3
Router(config)#access-list 4 permit any
Router(config)#int fa0/0
Router(config)#ip access-group 4 out
Router(config)#exit

For Access Remove

Router(config)#access-list 110 deny icmp host 10..0.2 host 30.0.0.3
Router(config)access-list 110 permit 110 permit ip any any
Router(config)int fa0/0
Router(config)ip access group 110 in
Router(config)#exit

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