interface FastEthernet0/0
 description OPTONLINE - CABLE MODEM$ETH-WAN$
 ip address xx.xx.xx.xx 255.255.255.248
 ip access-group outside in
 ip nbar protocol-discovery
 ip inspect myfw out
 ip flow ingress
 ip flow egress
 ip nat outside
 ip virtual-reassembly
 ip route-cache flow
 duplex auto
 speed auto
 crypto map mymap
!