防火墙的火字指的是什么意思？

Cisco路由器防火墙配置模板指的是什么？

show running-config version 11。2 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption no service udp-small-servers no service tcp-s mall-servers ! hostname fw-rtr ! enable password cisco ! username admin password cisco username chw10。 Sydney pass...全部

  show running-config version 11。2 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption no service udp-small-servers no service tcp-s mall-servers ! hostname fw-rtr ! enable password cisco ! username admin password cisco username chw10。
  Sydney password cisco no ip source-route ip nat pool inside-pool 203。1。1。2 203。1。1。254 netmask 255。
  255。255。0 ip nat inside source list 99 pool inside-pool ip domain-list domain。com ip domain-name domain。
  com ip name-server 192。168。1。1 ip inspect name internet smtp ip inspect name internet http java-list 42 timeout 60 ip inspect name internet ftp ip inspect name internet tcp ip inspect name internet udp ip inspect name internet realaudio ip inspect name internet h323 ip inspect name internet cuseeme isdn switch-type basic-net3 clock timezone AEST 10 ! interface Loopback0 ip address 203。
  1。1。1 255。255。255。0 ! interface Ethernet0 ip address 192。168。1。253 255。255。255。0 ip nat inside ip route-cache same-interface ! interface BRI0 no ip address encapsulation ppp dialer pool-member 1 no fair-queue ppp authentication chap callin ppp multilink ! interface Dialer0 description BigPond Dialup Link ip address 139。
  130。98。32 255。255。254。0 ip access-group 169 in ip access-group 158 out no ip unreachables no ip directed-broadcast no ip proxy-arp ip nat outside ip inspect internet out encapsulation ppp dialer remote-name chw10。
  Sydney dialer idle-timeout 999999 dialer string 84486000 dialer load-threshold 1 either dialer pool 1 dialer-group 1 no fair-queue no cdp enable ppp chap hostname anixte0 ppp multilink ! ip classless ip route 0。
  0。0。0 0。0。0。0 139。130。98。1 ip route 192。168。0。0 255。255。0。0 192。168。1。254 ip http server ip http access-class 1 logging buffered 16000 debugging logging 192。
  168。1。1。收起