IPsec
主要作用是对数据进行加密，因为他能提供所有有时候被单独用作实现加密的一种方法！IPsec建立的是一个逻辑隧道，并不是真正意义上的隧道！并且不能提供路由功能，因为IPsec不支持非ip流量，也不支持广播（组播）！
GRE
GRE是一种三层VPN封装技术。GRE可以对某些网络层协议（如IPX、Apple Talk、IP等）的报文进行封装，使封装后的报文能够在另一种网络中（如IPv4）传输，从而解决了跨越异种网络的报文传输问题，虽然无法提供加密，但是能很好的支持非ip流量和广播！
GRE over IPSec（使用IPsec来加密隧道进行传输）
GRE OVER IPSEC 是 gre 做内层封装， ipsec 做外层封装，ipsec 感兴趣数据流为 gre源目地址，适用于两点都是固定 ip 或者一方是动态 IP 或内网环境，由于 ipsec 不能传广播和组播，gre 可以，这种环境还可以运行一些适用组播和广播的协议。
IPSec over GRE（加密数据流后从隧道传输）
IPSEC OVER GRE 是 IPSEC 做内层封装，GRE 做外层封装，适用于两端路由器都是固定IP，ipsec 策略应用在物理口，ipsec 感兴趣数据流为业务网段，只对业务数据进行加密。
配置
sysname FW1
配置感兴趣流，源目都是业务地址段
acl number 3000
rule 5 permit ip source 192.168.1.0 0.0.0.255 destination 10.191.10.0 0.0.0.255
acl number 3001
rule 5 permit ip source 192.168.1.0 0.0.0.255 destination 10.191.20.0 0.0.0.255
安全提议正常配置，保证两端的参数一致就ok
ipsec proposal 1
esp authentication-algorithm sha2-256
esp encryption-algorithm aes-256
ike proposal 1
encryption-algorithm aes-256
dh group14
authentication-algorithm sha2-256
authentication-method pre-share
integrity-algorithm hmac-sha2-256
prf hmac-sha2-256
对端地址值得注意，ips over gre的对端地址是隧道地址
ike peer fw2
pre-shared-key huawei@123
ike-proposal 1
remote-address 12.1.1.2 //对端隧道地址
ike peer fw3
pre-shared-key huawei@123
ike-proposal 1
remote-address 22.1.1.2 //对端隧道地址
点到多点的场景中创建两个ipsec策略
ipsec policy ips1 1 isakmp
security acl 3000
ike-peer fw2
proposal 1
ipsec policy ips2 1 isakmp
security acl 3001
ike-peer fw3
proposal 1
interface GigabitEthernet1/0/0
undo shutdown
ip address 192.168.1.254 255.255.255.0
interface GigabitEthernet1/0/1
undo shutdown
ip address 172.16.0.254 255.255.255.0
interface GigabitEthernet1/0/3
undo shutdown
ip address 100.1.12.1 255.255.255.252
service-manage ping permit
interface Tunnel0
ip address 12.1.1.1 255.255.255.252
tunnel-protocol gre
keepalive
source GigabitEthernet1/0/3 //指定原接口
destination 100.1.12.6 //指定对端地址
ipsec policy ips1 //调用ipsec
interface Tunnel1
ip address 22.1.1.1 255.255.255.252
tunnel-protocol gre
keepalive
source GigabitEthernet1/0/3
destination 100.1.12.10
ipsec policy ips2
firewall zone trust
set priority 85
add interface GigabitEthernet0/0/0
add interface GigabitEthernet1/0/0
add interface GigabitEthernet1/0/1
add interface Tunnel0 //隧道接口要加入安全域，加入到非信任也可以
add interface Tunnel1
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/3
ip route-static 0.0.0.0 0.0.0.0 100.1.12.2
ip route-static 10.191.10.0 255.255.255.0 Tunnel0 //去往对端私网的路由指向隧道口
ip route-static 10.191.20.0 255.255.255.0 Tunnel1
security-policy
rule name t-un //防火墙繁琐之处，私网到私网的流量一定要设置正反向
source-zone trust
destination-zone untrust
source-address 192.168.1.0 mask 255.255.255.0
destination-address 10.191.10.0 mask 255.255.255.0
destination-address 10.191.20.0 mask 255.255.255.0
action permit
rule name un-t
source-zone untrust
destination-zone trust
source-address 10.191.10.0 mask 255.255.255.0
source-address 10.191.20.0 mask 255.255.255.0
destination-address 192.168.1.0 mask 255.255.255.0
action permit
rule name ipsce //如果隧道口放非信任区，就省去了两个命令，local-unt就都包含了
source-zone local
source-zone trust
source-zone untrust
destination-zone local
destination-zone trust
destination-zone untrust
action permit
rule name to-isp //放行nat的流量
source-zone trust
destination-zone untrust
source-address 192.168.1.0 mask 255.255.255.0
action permit
nat-policy
rule name no-ips //无论防火墙还是路由器，在nat中一定要先把隧道的流量禁止
source-zone trust
destination-zone untrust
source-address 192.168.1.0 mask 255.255.255.0
destination-address 10.191.10.0 mask 255.255.255.0
destination-address 10.191.20.0 mask 255.255.255.0
action no-nat
rule name to-isp
source-zone trust
destination-zone untrust
source-address 192.168.1.0 mask 255.255.255.0
action source-nat easy-ip
sysname FW2
acl number 3000
rule 5 permit ip source 10.191.10.0 0.0.0.255 destination 192.168.1.0 0.0.0.255
ipsec proposal 1
esp authentication-algorithm sha2-256
esp encryption-algorithm aes-256
ike proposal 1
encryption-algorithm aes-256
dh group14
authentication-algorithm sha2-256
authentication-method pre-share
integrity-algorithm hmac-sha2-256
prf hmac-sha2-256
ike peer fw1
pre-shared-key huawei@123
ike-proposal 1
remote-address 12.1.1.1
ipsec policy ips 1 isakmp
security acl 3000
ike-peer fw1
proposal 1
interface GigabitEthernet0/0/0
undo shutdown
ip binding vpn-instance default
ip address 192.168.0.1 255.255.255.0
alias GE0/METH
interface GigabitEthernet1/0/0
undo shutdown
ip address 10.191.10.254 255.255.255.0
interface GigabitEthernet1/0/3
undo shutdown
ip address 100.1.12.6 255.255.255.252
service-manage ping permit
interface Tunnel0
ip address 12.1.1.2 255.255.255.252
tunnel-protocol gre
keepalive
source GigabitEthernet1/0/3
destination 100.1.12.1
ipsec policy ips
firewall zone trust
set priority 85
add interface GigabitEthernet0/0/0
add interface GigabitEthernet1/0/0
add interface Tunnel0
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/3
firewall zone dmz
set priority 50
ip route-static 0.0.0.0 0.0.0.0 100.1.12.5
ip route-static 192.168.1.0 255.255.255.0 Tunnel0
security-policy
rule name t-un
source-zone trust
destination-zone untrust
source-address 10.191.10.0 mask 255.255.255.0
destination-address 192.168.1.0 mask 255.255.255.0
action permit
rule name un-t
source-zone untrust
destination-zone trust
source-address 192.168.1.0 mask 255.255.255.0
destination-address 10.191.10.0 mask 255.255.255.0
action permit
rule name ipsce
source-zone local
source-zone trust
source-zone untrust
destination-zone local
destination-zone trust
destination-zone untrust
action permit
rule name to-isp
source-zone trust
destination-zone untrust
source-address 10.191.10.0 mask 255.255.255.0
action permit
nat-policy
rule name t-un
source-zone trust
destination-zone untrust
source-address 10.191.10.0 mask 255.255.255.0
destination-address 192.168.1.0 mask 255.255.255.0
action no-nat
rule name to-isp
source-zone trust
destination-zone untrust
source-address 10.191.10.0 mask 255.255.255.0
action source-nat easy-ip
sysname FW3
acl number 3000
rule 5 permit ip source 10.191.20.0 0.0.0.255 destination 192.168.1.0 0.0.0.255
ipsec proposal 1
esp authentication-algorithm sha2-256
esp encryption-algorithm aes-256
ike proposal 1
encryption-algorithm aes-256
dh group14
authentication-algorithm sha2-256
authentication-method pre-share
integrity-algorithm hmac-sha2-256
prf hmac-sha2-256
ike peer fw1
pre-shared-key huawei@123
ike-proposal 1
remote-address 22.1.1.1
ipsec policy ips 1 isakmp
security acl 3000
ike-peer fw1
proposal 1
interface GigabitEthernet1/0/0
undo shutdown
ip address 10.191.20.254 255.255.255.0
interface GigabitEthernet1/0/3
undo shutdown
ip address 100.1.12.10 255.255.255.252
service-manage ping permit
interface Tunnel0
ip address 22.1.1.2 255.255.255.252
tunnel-protocol gre
keepalive
source GigabitEthernet1/0/3
destination 100.1.12.1
ipsec policy ips
firewall zone trust
set priority 85
add interface GigabitEthernet0/0/0
add interface GigabitEthernet1/0/0
add interface Tunnel0
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/3
firewall zone dmz
set priority 50
ip route-static 0.0.0.0 0.0.0.0 100.1.12.9
ip route-static 192.168.1.0 255.255.255.0 Tunnel0
security-policy
rule name t-un
source-zone trust
destination-zone untrust
source-address 10.191.20.0 mask 255.255.255.0
destination-address 192.168.1.0 mask 255.255.255.0
action permit
rule name un-t
source-zone untrust
destination-zone trust
source-address 192.168.1.0 mask 255.255.255.0
destination-address 10.191.20.0 mask 255.255.255.0
action permit
rule name ipsce
source-zone local
source-zone trust
source-zone untrust
destination-zone local
destination-zone trust
destination-zone untrust
action permit
rule name to-isp
source-zone trust
destination-zone untrust
source-address 10.191.20.0 mask 255.255.255.0
action permit
nat-policy
rule name t-un
source-zone trust
destination-zone untrust
source-address 10.191.20.0 mask 255.255.255.0
destination-address 192.168.1.0 mask 255.255.255.0
action no-nat
rule name to-isp
source-zone trust
destination-zone untrust
source-address 10.191.20.0 mask 255.255.255.0
action source-nat easy-ip
如果是点到点，总部配置删除一组即可
验证
