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Description:

This document describes how to set up an IKEv2 connection (site-to-site) between two LANCOM R&S®Unified Firewalls.


Requirements:

  • LANCOM R&S®Unified Firewall as of LCOS FX 10.4
  • A configured and functional Internet connection on each Unified Firewall
  • Any web browser for accessing the web interface of the Unified Firewall


Scenario:

The Unified Firewalls are connected directly to the Internet and have a public IPv4 address:

  • A company wants to connect its branch office, which operates a LANCOM R&S®Unified Firewall, via an IKEv2 site-to-site connection to the company headquarters, which also operates a LANCOM R&S®Unified
  • The branch office has an Internet connection with the fixed public IP address 81.81.81.81.
  • The headquarters has an Internet connection with the fixed public IP address 82.82.82.82.
  • The Unified Firewall at the headquarters should establish the VPN connection to the branch office.
  • The local network at the headquarters has the IP address range 168.50.0/23.
  • The local network at the branch office has the IP address range 168.66.0/24.

Info:
If the Unified Firewall uses an upstream (LANCOM) router to connect to the Internet, then the upstream device has to be set to forward its inbound ports 4500 and 500 to the LAN IP address of the Unified Firewall.


Procedure:

1) Configuration steps on the Unified Firewall at the headquarters:

1.1) Connect to the configuration interface of the Unified Firewall and navigate to VPN -> IPSec -> IPSec Settings.

1.2) Activate IPSec.

1.3) Switch to VPN -> IPSec -> Connections and click on the “+” icon to create a new IPSec connection.

1.4) Save the following parameters:

  • Name: Enter a descriptive name.
  • Security Profile: Select the security profile, e.g. IKEv2 Suite-B-GCM-256.
  • Connection: From the drop-down menu, select the Network connection used for the Internet connection.
  • Remote Gateway: Enter the public IP address or public DNS address of the branch office.
  • In this example the Unified Firewall at the headquarters should establish the VPN connection, so you select the option Initiate connection.

If you have created your own template or security profile, you can use these here.

1.5) Change to the Tunnels tab and enter the following parameters:

  • Local Networks: Here you enter the local networks (in CIDR notation) that the remote station should reach. In this example, the local network at the headquarters has the IP address range 192.168.50.0/23.
  • Remote Networks: Here you enter the local networks (in CIDR notation) that the remote station should reach. In this example, the local network at the branch office has the IP address range 192.168.66.0/24.

1.6) Change to the Authentication tab and enter the following parameters:

  • Authentication Type: Select the option PSK (Preshared Key).
  • PSK (Preshared Key): Set a preshared key for this connection.
  • Local Identifier: Set the local identifier.
  • Remote identifier: Set the remote identifier.

Important:
The local and remote identifiers must not match!

1.7) Click the icon to create a new VPN host.

1.8) Save the following parameters:

  • Name: Enter a descriptive name.
  • VPN Connection Type: Select the type IPSec.
  • IPSec Connection: From the drop-down menu under IPSec, select the VPN connection created in steps 1.4 - 1.6.

1.9) In the VPN host click on the "connection" icon and, to open the firewall objects, click on the network object that the object (the site-to-site connection) should access. Repeat this step for every network that the branch should be able to access.

1.10) Use the “+” sign to assign the required protocols to the VPN host.

Info:
A Unified Firewall uses a deny-all strategy. You therefore have to explicitly allow communication.

Info:
Firewall objects can also be accessed via Desktop -> Desktop Connections and clicking on the “edit” icon.

1.11) Finally, implement the configuration changes by clicking Activate in the firewall.

1.12) This concludes the configuration steps on the Unified Firewall at the headquarters.


2) Configuration steps on the Unified Firewall at the branch office:

2.1) Connect to the configuration interface of the Unified Firewall and navigate to VPN -> IPSec -> IPSec Settings.

2.2) Activate IPSec.

2.3) Switch to VPN -> IPSec -> Connections and click on the “+” icon to create a new IPSec connection.

2.4) Save the following parameters:

  • Name: Enter a descriptive name.
  • Security Profile: Select the security profile, e.g. IKEv2 Suite-B-GCM-256.
  • Connection: From the drop-down menu, select the Network connection used for the Internet connection.
  • Remote Gateway: Enter the public IP address or public DNS address of the headquarters.

If you have created your own template or security profile, you can use these here.

2.5) Change to the Tunnels tab and enter the following parameters:

  • Local Networks: Here you enter the local networks (in CIDR notation) that the remote station should reach. In this example, the local network at the branch office has the IP address range 192.168.66.0/24.
  • Remote Networks: Here you enter the local networks (in CIDR notation) that the remote station should reach. In this example, the local network at the headquarters has the IP address range 192.168.50.0/23.

1.6) Change to the Authentication tab and enter the following parameters:

  • Authentication Type: Select the option PSK (Preshared Key).
  • PSK (Preshared Key): Set the same preshared key for this connection as for the headquarters (see step 1.6)
  • Local Identifier: Set the local identifier.
  • Remote identifier: Set the remote identifier.

Important:
The local and remote identifiers must not match!

2.7) Click the icon to create a new VPN host.

2.8) Save the following parameters:

  • Name: Enter a descriptive name.
  • VPN Connection Type: Select the type IPSec.
  • IPSec Connection: From the drop-down menu under IPSec, select the VPN connection created in steps 2.4 - 2.6.

2.9) In the VPN host click on the "connection" icon and, to open the firewall objects, click on the network object that the object (the site-to-site connection) should access. Repeat this step for every network that the branch should be able to access.

2.10) Use the “+” sign to assign the required protocols to the VPN host.

Info:
A Unified Firewall uses a deny-all strategy. You therefore have to explicitly allow communication.

Info:
Firewall objects can also be accessed via Desktop -> Desktop Connection and clicking on the “edit” icon.

2.11) Finally, implement the configuration changes by clicking Activate in the firewall.

2.12) This concludes the configuration steps on the Unified Firewall at the branch office.

The VPN connection to the headquarters is established now.