GRE Tunnels
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GRE Tunnels
Configure a logical, point-to-point tunnel to encapsulate
a payload protocol.
- Network > GRE Tunnels
First configure a tunnel interface (Network > Interfaces
> Tunnel). Then add a generic routing encapsulation (GRE)
Tunnel and provide the following information, referencing the tunnel
interface you created:
GRE Tunnel Fields | Description |
---|---|
Name | Name of the GRE tunnel. |
Interface | Select the interface to use as the local GRE
tunnel endpoint (source interface), which is an Ethernet interface
or subinterface, an Aggregate Ethernet (AE) interface, a loopback interface,
or a VLAN interface. |
Local Address | Select the local IP address of the interface
to use as the tunnel interface address. |
Peer Address | Enter the IP address at the opposite end of
the GRE tunnel. |
Tunnel Interface | Select the Tunnel interface that you configured.
(This interface identifies the tunnel when it is the next hop for
routing.) |
TTL | Enter the TTL for the IP packet encapsulated
in the GRE packet (range is 1 to 255; default is 64). |
ERSPAN | Select to enable the firewall to decapsulate
Encapsulated Remote Switched Port Analyzer (ERSPAN) data sent through
the GRE tunnel. You can configure a network switch to use ERSPAN
to send mirrored traffic through a GRE tunnel to the firewall for
use by Security services like IoT Security. After decapsulating
the data, the firewall inspects it similar to how it inspects traffic
received on a TAP port. It then creates enhanced application logs (EALs)
and traffic, threat, WildFire, URL, data, GTP (when GTP is enabled), SCTP
(when SCTP is enabled), tunnel, auth, and decryption logs. The firewall forwards
these logs to the logging service where IoT Security accesses and analyzes
the data. |
Copy ToS Header | Select to copy the Type of Service (ToS) field
from the inner IP header to the outer IP header of the encapsulated
packets to preserve the original ToS information. |
Keep Alive | Select to enable the Keep Alive function for
the GRE tunnel (disabled by default). If you enable Keep Alive,
by default it takes three unreturned keepalive packets (Retries)
at 10-second intervals for the GRE tunnel to go down, and it takes
five Hold Timer intervals at 10-second intervals for the GRE tunnel
to come back up. |
Interval (sec) | Set the interval between keepalive packets
that the local end of the GRE tunnel sends to the tunnel peer, and
the interval that each Hold Timer waits after successful keepalive
packets before the firewall re-establishes communication with the
tunnel peer (range is 1 to 50; default is 10). |
Retry | Set the number of intervals that keepalive
packets are not returned before the firewall considers the tunnel
peer to be down (range is 1 to 255; default is 3). |
Hold Timer | Set the number of intervals that keepalive
packets are successful before the firewall re-establishes communication
with the tunnel peer (range is 1 to 64; default is 5). |