★ Typical configuration example of MSR V7 non-fixed address combined with DDNS to establish IPsec tunnel

[Network Topology & Requirements]

Both the headquarters and branch equipment are MSR3620, and both use PPPoE to dynamically obtain addresses. It is necessary to use DDNS technology to establish an IPSec VPN between the branch and headquarters equipment.

1. Headquarters configuration

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  dialer-group 1 rule ip permit

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  dns server 114.114.114.114 // DNS server configuration, required

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ddns policy GigabitEthernet0 / 0 // DDNS configuration

  url oray: //***.***

  username xxx

  password cipher $c$3$FfX6Z0QOVZmxJNi9wBg3TXqVJo2BwHGRgJvieDwFAEM=

  interval 0 0 1

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interface Dialer0

  ppp pap local-user xxx password cipher $c$3$7Gw/H5un4WfVczBy9PhVSnwUhwtzt0y5IS0M

  dialer bundle enable

  dialer-group 1

  ip address ppp-negotiate

  nat outbound 3200

  ddns apply policy GigabitEthernet0 / 0 fqdn ***.*** // interface application DDNS

  ipsec apply policy 123 // Bind the IPsec policy to the Dialer interface

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interface GigabitEthernet0 / 0

  pppoe-client dial-bundle-number 0

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  ip route-static 0.0.0.0 0 Dialer0 // Configure the default route

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acl advanced 3200 // NAT ACL

  rule 5 deny ip source 192.168.16.0 0.0.15.255 destination 192.168.0.0 0.0.15.255 // reject IPsec data flow

  rule 1000 permit ip

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ipsec transform-set 123 // Configure IPsec security proposal

  esp encryption-algorithm 3des-cbc

  esp authentication-algorithm sha1

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ipsec policy-template 123 65535 // Configure IPsec policy template

  transform-set 123

  ike-profile 123

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ipsec policy 123 65535 isakmp template 123 // Apply the template to the policy

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ike profile 123 // Configure IKE Profile

  keychain 123

  exchange-mode aggressive

  match remote identity fqdn 123

  proposal 65535

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ike proposal 65535 // Configure IKE proposal

  encryption-algorithm 3des-cbc

  authentication-algorithm md5

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ike keychain 123 // Configure IPsec pre-shared key

  pre-shared-key hostname 123 key cipher $c$3$kR2YXCsG8am/6KexFkGTgg2Y+dRksRw3wA==

2. Branch configuration

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  dialer-group 1 rule ip permit

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  dns server 114.114.114.114 // DNS server configuration, required

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interface Dialer0

  ppp pap local-user xxx password cipher $c$3$JkPr7vTBqgi+CcN3SEgqs6iP5Ytiag8NKTB

  dialer bundle enable

  dialer-group 1

  ip address ppp-negotiate

  nat outbound 3100

  ipsec apply policy 123 // Bind the IPsec policy to the Dialer interface

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interface GigabitEthernet0 / 0

  pppoe-client dial-bundle-number 0

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  ip route-static 0.0.0.0 0 Dialer0 // Configure the default route

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acl advanced 3000 // IPsec ACL

  rule 5 permit ip source 192.168.0.0 0.0.15.255 destination 192.168.16.0 0.0.15.255

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acl advanced 3100 // NAT ACL

  rule 5 deny ip source 192.168.0.0 0.0.15.255 destination 192.168.16.0 0.0.15.255 // reject IPsec data flow

  rule 1000 permit ip

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ipsec transform-set 123 // Configure IPsec security proposal

  esp encryption-algorithm 3des-cbc

  esp authentication-algorithm sha1

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ipsec policy 123 65535 isakmp // Configure IPsec policy

  transform-set 123

  security acl 3000

  remote-address ***.*** // The peer address is designated as the DDNS address

  ike-profile 123

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  ike identity fqdn 123 // Configure IKE FQDN

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ike profile 123 // Configure IKE Profile

  keychain 123

  exchange-mode aggressive

  match remote identity address 0.0.0.0 0.0.0.0 // Because the remote address is not fixed, match all addresses

  proposal 65535

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ike proposal 65535 // Configure IKE proposal

  encryption-algorithm 3des-cbc

  authentication-algorithm md5

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ike keychain 123  // Configure the IPsec pre-shared key. Note that the pre-shared-key address here must include the remote-address in the IPsec security policy, otherwise it will prompt that the pre-share-key cannot be found.

  pre-shared-key address 0.0.0.0 0.0.0.0 key cipher $c$3$bPT/nV7B9eYpBabcqorgjs8502r8yPqTCg ==