B-7
Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
Appendix B Sample Configurations
Example 2: Single Mode Firewall Using Same Security Level
ip address 209.165.201.3 255.255.255.224
no shutdown
interface gigabitethernet 0/1
nameif dept2
security-level 100
ip address 10.1.2.1 255.255.255.0
mac-address 000C.F142.4CDE standby 000C.F142.4CDF
no shutdown
rip authentication mode md5
rip authentication key scorpius key_id 1
interface gigabitethernet 0/2
nameif dept1
security-level 100
ip address 10.1.1.1 255.255.255.0
no shutdown
interface gigabitethernet 0/3
nameif dmz
security-level 50
ip address 192.168.2.1 255.255.255.0
no shutdown
same-security-traffic permit inter-interface
route outside 0 0 209.165.201.1 1
nat (dept1) 1 10.1.1.0 255.255.255.0
nat (dept2) 1 10.1.2.0 255.255.255.0
! The dept1 and dept2 networks use PAT when accessing the outside
global (outside) 1 209.165.201.9 netmask 255.255.255.255
! Because we perform dynamic NAT on these addresses for outside access, we need to perform
! NAT on them for all other interface access. This identity static statement just
! translates the local address to the same address.
static (dept1,dept2) 10.1.1.0 10.1.1.0 netmask 255.255.255.0
static (dept2,dept1) 10.1.2.0 10.1.2.0 netmask 255.255.255.0
! The syslog server uses a static translation so the outside management host can access
! the server
static (dmz,outside) 209.165.201.5 192.168.2.2 netmask 255.255.255.255
access-list MANAGE remark Allows the management host to access the syslog server
access-list MANAGE extended permit tcp host 209.165.200.225 host 209.165.201.5 eq telnet
access-group MANAGE in interface outside
! Advertises the security appliance IP address as the default gateway for the downstream
! router. The security appliance does not advertise a default route to the upstream
! router. Listens for RIP updates from the downstream router. The security appliance does
! not listen for RIP updates from the upstream router because a default route to the
! upstream router is all that is required.
router rip
network 10.0.0.0
default information originate
version 2
! The client uses a pre-shared key to connect to the security appliance over IPSec. The
! key is the password in the username command following.
isakmp policy 1 authentication pre-share
isakmp policy 1 encryption 3des
isakmp policy 1 group 2
isakmp policy 1 hash sha
isakmp enable outside
crypto ipsec transform-set vpn_client esp-3des esp-sha-hmac
username admin password passw0rd
crypto ipsec transform-set vpn esp-3des esp-sha-hmac
crypto dynamic-map vpn_client 1 set transform-set vpn
crypto map telnet_tunnel 1 ipsec-isakmp dynamic vpn_client
crypto map telnet_tunnel interface outside
ip local pool client_pool 10.1.1.2
access-list VPN_SPLIT extended permit ip host 209.165.201.3 host 10.1.1.2
telnet 10.1.1.2 255.255.255.255 outside
telnet timeout 30
logging trap 5
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