R1(config)#interface tunnel 1
R1(config-if)#ip address 1.1.1.1 255.255.255.0
R1(config-if)#tunnel source 12.1.1.1
R1(config-if)#tunnel destination 23.1.1.3
R1(config-if)#exit
R3(config)#int tunnel 3
R3(config-if)#ip address 1.1.1.3 255.255.255.0
R3(config-if)#tunnel source 23.1.1.3
R3(config-if)#tunnel destination 12.1.1.1
R3(config-if)#exit
R1(config)#crypto isakmp policy 1
R1(config-isakmp)#encryption 3des
R1(config-isakmp)#hash sha
R1(config-isakmp)#authentication pre-share
R1(config-isakmp)#group 2
R1(config-isakmp)#exit
R1(config)#crypto isakmp key 0 cisco123 address 23.1.1.3
R1(config)#crypto ipsec transform-set ccie esp-3des esp-sha-hmac
R1(cfg-crypto-trans)#exit
R1(config)#access-list 100 permit gre host 12.1.1.1 host 23.1.1.3 R1(config)#crypto map l2l 1 ipsec-isakmp
R1(config-crypto-map)#set peer 23.1.1.3
R1(config-crypto-map)#set transform-set ccie
R1(config-crypto-map)#match address 100 R1(config-crypto-map)#exit
R1(config)#int f0/0 R1(config-if)#crypto map l2l
R1(config-if)#exit
R1(config)#
*Mar 1 00:21:45.171: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is xml:lang="en-us">R1(config)#
R3(config)#crypto isakmp policy 1
R3(config-isakmp)#encryption 3des
R3(config-isakmp)#hash sha
R3(config-isakmp)#authentication pre-share
R3(config-isakmp)#group 2
R3(config-isakmp)#exit
R3(config)#crypto isakmp key 0 cisco123 address 12.1.1.1
R3(config)#crypto ipsec transform-set ccie esp-3des esp-sha-hmac
R3(cfg-crypto-trans)#exit
R3(config)#access-list 100 permit gre host 23.1.1.3 host 12.1.1.1 R3(config)#
R3(config)#crypto map l2l 1 ipsec-isakmp
R3(config-crypto-map)#set peer 12.1.1.1
R3(config-crypto-map)#set transform-set ccie
R3(config-crypto-map)#match address 100
R3(config-crypto-map)#exit
R3(config)#
R3(config)#int f0/1
R3(config-if)#crypto map l2l
R3(config-if)#
*Mar 1 00:32:58.907: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is xml:lang="en-us">R3(config-if)#
R1(config)#router eigrp 1
R1(config-router)#no auto-summary
R1(config-router)#network 1.1.1.1 0.0.0.0
R1(config-router)#network 10.1.1.1 0.0.0.0
R1(config-router)#exit
R3(config)#router eigrp 1
R3(config-router)#no auto-summary
R3(config-router)#network 1.1.1.3 0.0.0.0
R3(config-router)#network 192.168.1.3 0.0.0.0
R3(config-router)#
R3(config)#crypto ipsec transform-set ccie esp-3des esp-sha-hmac
R3(cfg-crypto-trans)#mode transport
R3#clear crypto sa
R3#
