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★ GRE over ipsec VPN multi-branch mutual access+automatical tunnel establishment

2020-12-15 Published
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Network Topology

 

Demand

 Establish GRE over ipsec vpn to realize intercommunication between each branch and the headquarters, and each branch can also access through the headquarters. The headquarters is a fixed IP address, the branch IP addresses are not fixed, and the branches A and B are unattended and the branches do not actively automatically access the business operations of the headquarters. Therefore, in order to prevent the branch equipment from being unable to actively establish tunnels after a power failure and restart, it is necessary to pass NQA to After the device is powered off and restarted, the tunnel establishment is automatically triggered.


Configuration Steps

HQ:

sysname Headquarters

#

interface LoopBack0

 ip address 192.168.1.1 255.255.255.0

#

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 1.1.1.2 255.255.255.252

 nat outbound

 ipsec apply policy test

#

interface Tunnel0 mode gre

 description toBrabchA

 ip address 172.16.1.1 255.255.255.0

 source 1.1.1.2

 destination 2.2.2.2

#

interface Tunnel1 mode gre

 description toBrabchB

 ip address 172.16.2.11 255.255.255.0

 source 1.1.1.2

 destination 3.3.3.2

 ip route-static 0.0.0.0 0 1.1.1.1

 ip route-static 192.168.2.0 24 tunnel0

 ip route-static 192.168.3.0 24 tunnel1

#

acl advanced 3000

 description toBranchA

 rule 0 permit ip source 1.1.1.2 0.0.0.0 destination 2.2.2.2 0.0.0.0

acl advanced 3001

 description toBranchB

 rule 0 permit ip source 1.1.1.2 0.0.0.0 destination 3.3.3.2 0.0.0.0

#

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 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

#

 

BranchA:

#

sysname branchA

#

nqa entry admin test

 type icmp-echo

  destination ip 1.1.1.2

  frequency 5000

  history-record enable

  history-record number 10

  probe count 10

  probe timeout 500

  source ip 2.2.2.2

#

 nqa schedule admin test start-time now lifetime forever

#

interface LoopBack0

 ip address 192.168.2.1 255.255.255.0

#

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 2.2.2.2 255.255.255.252

 nat outbound

 ipsec apply policy 1

#

interface Tunnel0 mode gre

 ip address 172.16.1.2 255.255.255.0

 source 2.2.2.2

 destination 1.1.1.2

#

 ip route-static 0.0.0.0 0 2.2.2.1

 ip route-static 192.168.1.0 24 Tunnel0

 ip route-static 192.168.3.0 24 Tunnel0

#

acl advanced 3000

 rule 0 permit ip source 2.2.2.2 0.0.0.0 destination 1.1.1.2 0.0.0.0

#

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

#

BranchB  :

#

sysname branchB

#

 

nqa entry admin test

 type icmp-echo

  destination ip 1.1.1.2

  frequency 5000

  history-record enable

  history-record number 10

  probe count 10

  probe timeout 500

  source ip 3.3.3.2

#

 nqa schedule admin test start-time now lifetime forever

#

interface LoopBack0

 ip address 192.168.3.1 255.255.255.0

#

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 3.3.3.2 255.255.255.252

 nat outbound

 ipsec apply policy 1

#

interface Tunnel0 mode gre

 ip address 172.16.1.3 255.255.255.0

 source 3.3.3.2

 destination 1.1.1.2

#

 ip route-static 0.0.0.0 0 3.3.3.

 ip route-static 192.168.1.0 24 Tunnel0

 

 ip route-static 192.168.2.0 24 Tunnel0

#

acl advanced 3000

 rule 0 permit ip source 3.3.3.2 0.0.0.0 destination 1.1.1.2 0.0.0.0

#

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

 

Key Configuration

interface GigabitEthernet0/0

  port link-mode route

  ip address 1.1.1.2 255.255.255.252

//GRE packets will not be NATed, so there is no need for deny ipsec in the NAT area of interest.

  nat outbound

  ipsec apply policy test

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