CCNP实验:GRE隧道流量的IPSEC加密Cisco认证考试

文章作者 100test 发表时间 2009:04:10 00:00:34
来源 100Test.Com百考试题网


  由于IPSEC只支持对单播流量的加密,所以我们使用GRE隧道可以将广播、组播包封装在一个单播包中,再用IPSEC进行加密。
  在进行IPSEC配置前应首先配置好GRE隧道,下面是R1上的GRE隧道配置:
  R1:
  interface tunnel0
  ip address 192.168.3.1 255.255.255.0
  tunnel source s1/1
  tunnel destination 192.1.1.20
  exit
  interface s1/1
  ip address 192.1.1.40 255.255.255.0
  ip access-group perimeter in
  exit
  interface lo0
  ip address 192.168.1.1 255.255.255.0
  exit
  ip route 0.0.0.0 0.0.0.0 192.1.1.20
  !在这里我将总公司内部的骨干网络设为Area0,隧道部分和分公司内部网络设为Area1
  router ospf 1
  network 192.168.1.0 0.0.0.255 area 0
  network 192.168.3.0 0.0.0.255 area 1
  exit
  ip access-list extended perimeter
  permit udp host 192.1.1.20 host 192.1.1.40 eq 500
  permit esp host 193.1.1.20 host 192.1.1.40
  permit gre host 193.1.1.20 host 192.1.1.40
  deny ip any any
  exit
  R2:
  interface tunnel0
  ip address 192.168.3.2 255.255.255.0
  tunnel source s1/0
  tunnel destination 192.1.1.40
  exit
  interface s1/0
  ip address 192.1.1.20 255.255.255.0
  ip access-group perimeter in
  exit
  interface lo0
  ip address 192.168.2.1 255.255.255.0
  exit
  ip route 0.0.0.0 0.0.0.0 192.1.1.40
  router ospf 1
  network 192.168.2.0 0.0.0.255 area 1
  network 192.168.3.0 0.0.0.255 area 1
  exit
  ip access-list extended perimeter
  permit udp host 192.1.1.40 host 192.1.1.20 eq 500
  permit esp host 192.1.1.40 host 192.1.1.20
  permit gre host 192.1.1.40 host 192.1.1.20
  deny ip any any
  exit
  GRE隧道建立好后,就可以进行IPSEC配置了:
  R1上的配置:
  crypto isakmp enable
  crypto isakmp identity address
  crypto isakmp policy 10
  encryption aes
  authentication pre-share
  group 2
  hash sha
  exit
  crypto isakmp key cisco123 address 192.1.1.20 no-xauth
  !IPSEC只对进入GRE隧道的流量进行加密
  ip access-list extended ToR2
  permit gre host 192.1.1.40 host 192.1.1.20
  exit
  !这里的GRE隧道是点对点模式的,所以传输集应使用传输模式
  crypto ipsec transform-set trans esp-aes esp-sha-hmac
  mode transport
  exit
  crypto map mymap 10 ipsec-isakmp
  match address ToR2
  set transform-set trans
  set peer 192.1.1.20
  exit
  interface s1/1
  crypto map mymap
  exit
  !最后别忘记删除测试隧道时建立的流量:
  ip access-list extended perimeter
  no permit gre host 192.1.1.20 host 192.1.1.40



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