Comany（config-ext-nacl）#exit
Comany（config）#crypto ipsec transform-set a esp-des esp-sha-hmac
Comany(cfg-crypto-trans)#mode transport
Comany(cfg-crypto-trans)#
Comany(cfg-crypto-trans)#exit
Comany（config）#crypto map mymap 10 ipsec-isakmp
Comany（config-crypto-map）#match address ToComany1
Comany（config-crypto-map）#set transform-set a
Comany（config-crypto-map）#set peer 172.16.1.1
Comany（config-crypto-map）#
Comany（config-crypto-map）#exit
Comany（config）#interface s0/1
Comany（config-if）#crypto map mymap
Comany（config-if）#
Comany（config-if）#exit
Comany（config）#
Comany（config）#ip access-list extended perimeter
Comany（config-ext-nacl）#no permit gre host 172.16.1.1 host 172.16.0.1
Comany（config-ext-nacl）#
Comany（config-ext-nacl）#en
Comany#
配置总公司到分公司2的GRE加密
Comany（config）#crypto isakmp enable
Comany（config）#crypto isakmp identity address
Comany（config）#crypto isakmp policy 1
Comany（config-isakmp）#encryption des
Comany（config-isakmp）#authentication pre-share
Comany（config-isakmp）#group 1
Comany（config-isakmp）#hash sha
Comany（config-isakmp）#exit
Comany（config）#
Comany（config）#crypto isakmp key cisco123456 address 172.16.2.1 no-xauth
Comany（config）#ip access-list extended ToComany2
Comany（config-ext-nacl）#permit gre host 172.16.0.1 host 172.16.2.1
Comany（config-ext-nacl）#
Comany（config-ext-nacl）#exit
Comany（config）#crypto ipsec transform-set b esp-des esp-sha-hmac
Comany(cfg-crypto-trans)#mode transport
Comany(cfg-crypto-trans)#
Comany(cfg-crypto-trans)#exit
Comany（config）#crypto map mymap1 1 ipsec-isakmp
Comany（config-crypto-map）#match address ToComany2
Comany（config-crypto-map）#set transform-set b
Comany（config-crypto-map）#set peer 172.16.2.1
Comany（config-crypto-map）#
Comany（config-crypto-map）#exit
Comany（config）#interface s0/1
Comany（config-if）#crypto map mymap1
Comany（config-if）#
Comany（config-if）#exit
Comany（config）#
Comany（config）#ip access-list extended perimeter
Comany（config-ext-nacl）#no permit gre host 172.16.2.1 host 172.16.0.1
Comany（config-ext-nacl）#
Comany（config-ext-nacl）#en
Comany#
5.3.2 分公司1路由器配置
Comany1（config）#crypto isakmp enable
Comany1（config）#crypto isakmp identity address
Comany1（config）#crypto isakmp policy 10
Comany1（config-isakmp）#encryption des
Comany1（config-isakmp）#authentication pre-share
Comany1（config-isakmp）#group 2
Comany1（config-isakmp）#hash sha
Comany1（config-isakmp）#exit
Comany1（config）#
Comany1（config）#crypto
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