Above you see the Cisco ASA in the middle with three interfaces:

  • Interface E0/0 as the INSIDE.
  • Interface E0/1 as the OUTSIDE.
  • Interface E0/2 as our DMZ.

nameif

ASA1(config)# interface E0/0
ASA1(config-if)# nameif INSIDE
INFO: Security level for "INSIDE" set to 100 by default.
ASA1(config-if)# ip address 192.168.1.254 255.255.255.0
ASA1(config-if)# no shutdown

ASA1(config)# interface E0/1
ASA1(config-if)# nameif OUTSIDE
INFO: Security level for "OUTSIDE" set to 0 by default.
ASA1(config-if)# ip address 192.168.2.254 255.255.255.0
ASA1(config-if)# no shutdown

ASA1(config)# interface E0/2
ASA1(config-if)# nameif DMZ
INFO: Security level for "DMZ" set to 0 by default.
ASA1(config-if)# security-level 50
ASA1(config-if)# ip address 192.168.3.254 255.255.255.0
ASA1(config-if)# no shutdown

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