The above example ACL (DENY-TELNET) contains two rule statements, one deny and one permit.
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Example 2:ĭeny telnet traffic from host 10.1.1.1 to host 10.2.2.2 and allow everything else.Ĭiscoasa(config)# access-list DENY-TELNET extended deny tcp host 10.1.1.1 host 10.2.2.2 eq 23Ĭiscoasa(config)# access-list DENY-TELNET extended permit ip host 10.1.1.1 host 10.2.2.2Ĭiscoasa(config)# access-group DENY-TELNET in interface inside Remember that there is an implicit DENY ALL rule at the end of the ACL which is not shown by default, therefore all other traffic will be blocked. The name “HTTP-ONLY” is the Access Control List name itself, which in our example contains only one permit rule statement. To apply the ACL on a specific interface use the access-group command as below:Ĭiscoasa(config)# access-group “access_list_name” interface “interface_name” Example 1:Īllow only http traffic from inside network 10.0.0.0/24 to outside internet.Ĭiscoasa(config)# access-list HTTP-ONLY extended permit tcp 10.0.0.0 255.255.255.0 any eq 80Ĭiscoasa(config)# access-group HTTP-ONLY in interface inside The basic command format of the Access Control List is the following:Ĭiscoasa(config)# access-list “access_list_name” extended protocol “source_address” “mask” “dest_address” “mask” Let us see some examples below to clarify what we have said above. At the end of the ACL, the firewall inserts by default an implicit DENY ALL statement rule which is not visible in the configuration.Įnough theory so far. The opposite happens for deny ACL statements. The ACL permit or deny statements basically consist of source and destination IP addresses and ports.Ī permit ACL statement allows the specified source IP address/network to access the specified destination IP address/network. The “out” ACL is applied to traffic exiting from a firewall interface. The opposite happens for ACL applied to the outbound (out) direction. If the ACL is applied on the inbound traffic direction (in), then the ACL is applied to traffic entering a firewall interface. The ACL (list of policy rules) is then applied to a firewall interface, either on the inbound or on the outbound traffic direction.
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Basically an Access Control List enforces the security policy on the network.
HOW TO CONFIGURE CISCO ASA 5505 SERIES
For more information about the configuration register, see the Cisco ASA 5500 Series Command Reference.An ACL is a list of rules with permit or deny statements. The default configuration register value is 0x1. Step 16 Load the default configuration by entering the following command:
HOW TO CONFIGURE CISCO ASA 5505 PASSWORD
Hostname(config)# username name password password
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Hostname(config)# enable password password Step 15 Change the passwords, as required, in the default configuration by entering the following commands: Step 14 Access the global configuration mode by entering the following command:
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Hostname# copy startup-config running-config Step 13 Load the startup configuration by entering the following command: Step 12 When prompted for the password, press Enter. Step 11 Access the privileged EXEC mode by entering the following command: You need to do the following to get the startup-config back in place and the register changed: So looked up the reset password for the ASA device and found that the register 0x41 tells the router to ignore the startup configuration.