GIF Interfaces

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GIF tunneling interfaces are added from Interfaces > (assign) on the GIF tab.

GIF is a generic tunneling mechanism that can be used for IPv4 and IPv6 traffic.

GIF tunnels can be added, edited, or deleted from the list view.

Configuration

When adding or editing a GIF interface, the following fields are required:

  • Parent interface - Interface on which to bind the GIF tunnel (typically a WAN)
  • GIF Remote address - Far side peer address outside the tunnel
  • GIF Tunnel local address - Local address for inside the GIF tunnel (typically a small private network)
  • GIF Tunnel remote address - Remote address for inside the GIF tunnel (typically a small private network)

The following are optional:

  • Route caching - Routes for traffic to cross the GIF interface will be remembered, should be unchecked in most cases especially with dynamic routing.
  • ECN friendly behavior - Be friendly to ECN but violate RFC2893. Should only be used if both sides agree.
  • Description - Text for reference about the name/purpose of this tunnel.

Firewall Rules

Traffic must be passed on the GIF interface and there is no general tab for GIF traffic. This means that it is required to add and then enable it under Interfaces > (assign). When doing so, keep the IP types set to None on the Interface page as that is managed by the configuration here on the GIF tab.

Example

Site A:

  • Parent interface - WAN
  • GIF Remote address - 2.2.2.2 (Public IP of Site B)
  • GIF Tunnel local address - 192.0.2.66
  • GIF Tunnel remote address - 192.0.2.65/30

Site B:

  • Parent interface - WAN
  • GIF Remote address - 1.1.1.1 (Public IP of Site B)
  • GIF Tunnel local address - 192.0.2.65
  • GIF Tunnel remote address - 192.0.2.66/30

Limitations

With GIF interfaces and bridging, it is not possible to ping the router endpoints but clients can ping each other. Without bridging, the router endpoint IP addresses are reachable with ping.

IPv4 / IPv6

Tunnels can only be used for either IPv4 or IPv6 at one time, not both.

For more information on using GIF with an IPv6 Tunnel Broker, see: Using IPv6 with a Tunnel Broker