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Barracuda NextGen Firewall X

Why is my dynamically assigned local ISP not working for the IPsec site to site VPN tunnel?

  • Type: Knowledgebase
  • Date changed: 3 years ago

Solution #00006954


 NG Firewall, Firmware 5.4.X


If you configure a Site to Site IPsec tunnel, using a local dynamic interface (DSL, DHCP), the service will not bind to those IPs, unless you do the following.

Tech library suggest the following:

?Local IKE Gateway

  • The IP address of the local IKE gateway. If you are using dynamic IP addresses, enter is incorrect since NG-admin will not allow you to enter ?/0? ? the entry should just be ?

Also, in order to get this to work, you need to enable the ?Use IPSec dynamic IPs? options located in the ?VPN Server Settings?:

  1. Open the VPN Settings page (Config Full Config > Box > Virtual Servers > your virtual server > Assigned Services > VPN-Service > VPN Settings).

  2. Click the ?Click here for Server Settings?? blue hyper link.

  3. Click the Advanced tab

  4. In the ?IKE Parameters?, change the ?Use IPSec dynamic IPs? option to ?Yes?

  5. Click ?OK? Send changes and Activate.

Additional Information:

After making the change you should be able to confirm the change by running the following command:

  • # netstat -tulpen grep ike

Also, in the firewall Live or History tab, you will see connection on port 500

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