ASA 5505 Basic Configurations
ISP Provider gives WAN IP: 105.108.52.151 /27
ISP Default Gateway 105.108.52.129
LAN Your Local Area Network IP: 10.2.1.0 /24
ASA inside IP 10.2.1.1 subnet mask 255.255.255.0
ASA# config t
ASA (config) # hostname BabuASA5505
BabuASA5505 (config) # domain-name babu.com
BabuASA5505 (config) #enable password xxx
Default E0/1 to E0/7 all interface configured with VLAN1 and E0/0 configured with VLAN2 Factory
default configuration (Pre-configured).
BabuASA5505 (config) # interface Vlan1
BabuASA5505 (config) # nameif inside
BabuASA5505 (config) # security-level 100
BabuASA5505 (config) # ip address 10.2.1.1 255.255.255.0
BabuASA5505 (config) # no shutdown
BabuASA5505 (config) # interface Vlan2
BabuASA5505 (config) # nameif outside
BabuASA5505 (config) # security-level 0
BabuASA5505 (config) # ip address 105.108.52.151 255.255.255.224
BabuASA5505 (config) # no shutdown
BabuASA5505 (config) # interface Ethernet0/0
BabuASA5505 (config) # switch-port access vlan2
BabuASA5505 (config) #interface Ethernet0/1
BabuASA5505 (config) # no shutdown
interface Ethernet0/2
Shutdown
!
interface Ethernet0/3
Shutdown
!
interface Ethernet0/4
Shutdown
!
interface Ethernet0/5
Shutdown
!
interface Ethernet0/6
Shutdown
!
interface Ethernet0/7
Shutdown
NAT Configuration:
Permit specific LAN Network to have WAN Access
BabuASA5505 (config) # nat (inside) 1 10.2.1.0 255.255.255.0 0.0
Or
Default all network to have WAN Access (All LAN subnet to have access WAN).
BabuASA5505 (config) # nat (inside) 1 0.0.0.0 0.0.0.0 0.0
Specify WAN (for NAT /PAT) ip address of the LAN network you can specify ip address or
range of ip addresses or WAN interface.
BabuASA5505 (config) # global (outside) 1 interface
Note: both NAT, Global using No. 1 (parameter), when NAT/PAT doing based on this
Parameter, same parameter then only translation will happen.
Configure default route:
BabuASA5505 (config) # route outside 0.0.0.0 0.0.0.0 105.108.52.129 1
Here 105.108.52.129 is the ISP default gateway address. 1 – Administrative distance. it is
optional.