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★ IPsec multi-branch mutual access + automatical tunnel establishment

2020-12-15 Published
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Network Topology

  


Establish ipsec vpn to realize intercommunication between each branch and headquarters, and each branch can also access through the headquarters.  

Configuration Steps

Headquarters:  

#

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 1.1.1.2 255.255.255.252

 nat outbound 3002

 ipsec apply policy test

#

 ip route-static 0.0.0.0 0 1.1.1.1

#

 

acl advanced 3000

 description toBranchA

 rule 0 permit ip source 192.168.1.0 0.0.0.255 destination 192.168.2.0 0.0.0.255

 rule 5 permit ip source 192.168.3.0 0.0.0.255 destination 192.168.2.0 0.0.0.255

#

 

acl advanced 3001

 description toBranchB

 rule 0 permit ip source 192.168.1.0 0.0.0.255 destination 192.168.3.0 0.0.0.255

 rule 5 permit ip source 192.168.2.0 0.0.0.255 destination 192.168.3.0 0.0.0.255

#

 

acl advanced 3002

 description outboundNATDenyFlow

 rule 0 deny ip source 192.168.1.0 0.0.0.255 destination 192.168.2.0 0.0.0.255

 rule 5 deny ip source 192.168.3.0 0.0.0.255 destination 192.168.2.0 0.0.0.255

 rule 10 deny ip source 192.168.1.0 0.0.0.255 destination 192.168.3.0 0.0.0.255

 rule 15 deny ip source 192.168.2.0 0.0.0.255 destination 192.168.3.0 0.0.0.255

 rule 100 permit ip

#

 

ipsec transform-set 1

 esp encryption-algorithm 3des-cbc

 esp authentication-algorithm md5

#

 

ipsec policy-template branchA 1

 transform-set 1

 security acl 3000

 ike-profile branchA

#

 

ipsec policy-template branchB 1

 transform-set 1

 security acl 3001

 ike-profile branchB

#

ipsec policy test 1 isakmp template branchA

#

ipsec policy test 2 isakmp template branchB

#

ike dpd interval 10 on-deman

#

 

ike profile branchA

 keychain branchA

 exchange-mode aggressive

 local-identity fqdn headquarters

 match remote identity fqdn branchA

#

ike profile branchB

 keychain branchB

 exchange-mode aggressive

 local-identity fqdn headquarters

 match remote identity fqdn branchB

#

ike proposal 1

 encryption-algorithm 3des-cbc

 authentication-algorithm md5

#

 

ike keychain branchA

 match local address 1.1.1.2

 pre-shared-key hostname branchA key simple 12345678

#

 

ike keychain branchB

 match local address 1.1.1.2

 pre-shared-key hostname branchB key simple 12345678

#

Branch A  :

#

nqa entry admin test

 type icmp-echo

  destination ip 192.168.1.1

  frequency 5000

  history-record enable

  history-record number 10

  probe count 10

  probe timeout 500

  source ip 192.168.2.1

#

 

nqa entry admin test1

 type icmp-echo

  destination ip 192.168.3.1

  frequency 5000

  history-record enable

  history-record number 10

  probe count 10

  probe timeout 500

  source ip 192.168.2.1

#

 nqa schedule admin test start-time now lifetime forever

 nqa schedule admin test1 start-time now lifetime forever

#

 

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 2.2.2.2 255.255.255.252

 nat outbound 3001

 ipsec apply policy 1

#

 ip route-static 0.0.0.0 0 2.2.2.1

#

acl advanced 3000

 rule 0 permit ip source 192.168.2.0 0.0.0.255 destination 192.168.1.0 0.0.0.255

 rule 5 permit ip source 192.168.2.0 0.0.0.255 destination 192.168.3.0 0.0.0.255

#

 

acl advanced 3001

 rule 0 deny ip source 192.168.2.0 0.0.0.255 destination 192.168.1.0 0.0.0.255

 rule 5 deny ip source 192.168.2.0 0.0.0.255 destination 192.168.3.0 0.0.0.255

 rule 100 permit ip

 

#

ipsec transform-set 1

 esp encryption-algorithm 3des-cbc

 esp authentication-algorithm md5

#

ipsec policy 1 1 isakmp

 transform-set 1

 security acl 3000

 remote-address 1.1.1.2

 ike-profile 1

#

ike dpd interval 10 on-demand

#

ike profile 1

 keychain 1

 exchange-mode aggressive

 local-identity fqdn branchA

 match remote identity fqdn headquarters

#

 

ike proposal 1

 encryption-algorithm 3des-cbc

 authentication-algorithm md5

#

 

ike keychain 1

 pre-shared-key address 1.1.1.2 255.255.255.0 key simple 12345678

#

Branch   B:

#

nqa entry admin test

 type icmp-echo

  destination ip 192.168.1.1

  frequency 5000

  history-record enable

  history-record number 10

  probe count 10

  probe timeout 500

  source ip 192.168.3.1

#

 

nqa entry admin test1

 type icmp-echo

  destination ip 192.168.2.1

  frequency 5000

  history-record enable

  history-record number 10

  probe count 10

  probe timeout 500

  source ip 192.168.3.1

#

 

 nqa schedule admin test start-time now lifetime forever

 nqa schedule admin test1 start-time now lifetime forever

 

#

 

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 3.3.3.2 255.255.255.252

 nat outbound 3001

 ipsec apply policy 1

#

 ip route-static 0.0.0.0 0 3.3.3.1

#

acl advanced 3000

 rule 0 permit ip source 192.168.3.0 0.0.0.255 destination 192.168.1.0 0.0.0.255

 rule 5 permit ip source 192.168.3.0 0.0.0.255 destination 192.168.2.0 0.0.0.255

#

acl advanced 3001

 rule 0 deny ip source 192.168.3.0 0.0.0.255 destination 192.168.1.0 0.0.0.255

 rule 5 deny ip source 192.168.3.0 0.0.0.255 destination 192.168.2.0 0.0.0.255

 rule 100 permit ip

#

ipsec transform-set 1

 esp encryption-algorithm 3des-cbc

 esp authentication-algorithm md5

#

ipsec policy 1 1 isakmp

 transform-set 1

 security acl 3000

 remote-address 1.1.1.2

 ike-profile 1

#

ike dpd interval 10 on-demand

#

ike profile 1

 keychain 1

 exchange-mode aggressive

 local-identity fqdn branchB

 match remote identity fqdn headquarters

#

ike proposal 1

 encryption-algorithm 3des-cbc

 authentication-algorithm md5

#

ike keychain 1

 pre-shared-key address 1.1.1.2 255.255.255.0 key simple 12345678


Test:

 

Key Configuration

In order to prevent the headquarters from restarting, the invalid ipsec sa of the branch was not deleted in time, which caused business failure after the headquarters restarted. Need to configure DPD on the branch.

ike dpd interval 10 on-demand 

Only need to configure on two branches.  

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