gre實驗：
路由器cq與路由器sh之間通過isp相連。執行ip協議的私有網路的兩個子網cq和sh，通過在兩台路由器之間使用gre over ipsec vpn建立隧道實現私網互聯。
拓撲圖如圖所示：
路由器ar3的配置命令：
system-view
sysname isp
inte***ce g0/0/0
ip address 6.6.6.2 29
inte***ce g0/0/1
ip address 16.16.16.2 29
inte***ce loopback 100
ip address 99.99.99.99 32
system-view
sysname cq
inte***ce g0/0/0
ip address 6.6.6.1 29
inte***ce g0/0/2
ip address 192.168.6.1 24
ip route-static 0.0.0.0 0.0.0.0 6.6.6.2
inte***ce tunnel0/0/1
ip address 10.10.10.1 30
tunnel-protocol gre
source 6.6.6.1
destination 16.16.16.1
ip route-static 192.168.16.0 255.255.255.0 tunnel0/0/1
acl 2000
rule 5 permit source any
inte***ce g0/0/0
nat outbound 2000
rip
version 2
network 10.0.0.0
network 192.168.6.0
ospf
area 0
network 10.10.10.0 0.0.0.3
network 192.168.6.0 0.0.0.255
ipsec proposal lance-proposal
esp authentication-algorithm sha1
ike peer lance-peer v2
pre-shared-key cipher lucy
ipsec profile lance
ike-peer lance-peer
proposal lance-proposal
inte***ce g0/0/2
ip address 192.168.6.1 255.255.255.0
inte***ce g0/0/0
ip address 6.6.6.1 255.255.255.0
system-view
sysname sh
inte***ce g0/0/1
ip address 16.16.16.1 29
inte***ce g0/0/2
ip address 192.168.16.1 24
ip route-static 0.0.0.0 0.0.0.0 16.16.16.2
inte***ce tunnel0/0/1
ip address 10.10.10.1 30
tunnel-protocol gre
source 16.16.16.1
destination 6.6.6.1
ip route-static 192.168.6.0 255.255.255.0 tunnel0/0/1
acl 2000
rule 5 permit source any
inte***ce g0/0/1
nat outbound 2000
rip
version 2
network 10.0.0.0
network 192.168.16.0
ospf
area 0
network 10.10.10.0 0.0.0.3
network 192.168.16.0 0.0.0.255
ipsec proposal lance-proposal
esp authentication-algorithm sha1
ike peer lance-peer v2
pre-shared-key cipher lucy
ipsec profile lance
ike-peer lance-peer
proposal lance-proposal
inte***ce g0/0/2
ip address 192.168.16.1 255.255.255.0
inte***ce g0/0/0
ip address 16.16.16.1 255.255.255.0
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