组网及说明

注:如无特别说明,描述中的 FW1对应拓扑中设备名称末尾数字为 1 的设备,FW对应拓扑中设备名称末尾数字为 NAT场景下的IPsec隧道的建立(模板方式)2 的设备,以此类推;另外,同一网段中,IP 地址的主机位为其设备编号,如 FW1 的 g0/0 接口若在 1.1.1.0/24
网段,则其 IP 地址为 1.1.1.1/24
,以此类推。
实验需求
1.FW2接口GE_0/1作natoutbound
2.FW1和FW3建立IPsec隧道,涉及nat穿越.
3.不涉及安全域和安全策略
4.FW1和FW3建立环回口地址,模拟业务网段,即感兴趣流。
配置步骤
FW1:
#
interface LoopBack0
ip address 10.1.1.1 255.255.255.0 /感兴趣流地址
#
interface GigabitEthernet1/0/0
port link-mode route
combo enable copper
ip address 172.16.1.1 255.255.255.0
ipsec apply policy ply
#
ip route-static 1.1.1.0 24 172.16.1.2
ip route-static 10.2.2.0 24 172.16.1.2
#
acl advanced 3000
rule 0 permit ip source 10.1.1.1 0 destination 10.2.2.3 0
#
ipsec transform-set ts
esp encryption-algorithm aes-cbc-128
esp authentication-algorithm md5
#
ipsec policy ply 1 isakmp
transform-set ts
security acl 3000
local-address 172.16.1.1
remote-address 1.1.1.3
ike-profile pf
#
ike profile pf
keychain key
local-identity address 1.1.1.1
dpd interval 5 on-demand
match remote identity address 1.1.1.3 255.255.255.255
#
ike keychain key
pre-shared-key address 1.1.1.3 255.255.255.255 key cipher $c$3$z7lFP/twkCnmA3osQjo/9m+TZgtyfVc22w==
#
FW2:
#
nat address-group 1
address 1.1.1.1 1.1.1.1
#
interface GigabitEthernet1/0/0
port link-mode route
combo enable copper
ip address 172.16.1.2 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-mode route
combo enable copper
ip address 1.1.1.2 255.255.255.0
nat outbound address-group 1
FW3
#
interface LoopBack0
ip address 10.2.2.3 255.255.255.0
#
interface GigabitEthernet1/0/0
port link-mode route
combo enable copper
ip address 1.1.1.3 255.255.255.0
ipsec apply policy ply
#
ip route-static 10.1.1.0 24 1.1.1.1
#
ipsec transform-set ts
esp encryption-algorithm aes-cbc-128
esp authentication-algorithm md5
#
ipsec policy-template pt 1
transform-set ts
ike-profile pf
#
ipsec policy ply 1 isakmp template pt
#
ike profile pf
keychain key
dpd interval 5 on-demand
local-identity address 1.1.1.3
match remote identity address 1.1.1.1 255.255.255.255
#
ike keychain
key pre-shared-key address 1.1.1.1 255.255.255.255 key cipher $c$3$vVHCQpfnhNIjt7qsouibsAR92FphiThORg== #
配置关键点
FW1侧ike profile中local ID要写NAT后的地址,不然在FW3侧看来remote ID是NAT前地址,如下:
Local IP: 1.1.1.3
Local ID type: IPV4_ADDR
Local ID: 1.1.1.3
Remote IP: 1.1.1.1
Remote ID type: IPV4_ADDR
Remote ID: 172.16.1.1
与本端配置不匹配,如下:
ike profile pf
keychain key
dpd interval 5 on-demand
local-identity address 1.1.1.3
match remote identity address 1.1.1.1 255.255.255.255
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