Configure network interfaces Configure GRE interfaces
Digi TransPort WR Routers User Guide 228
Advanced GRE parameters
Metric
The connected metric of an interface. The default metric of a connected interface is 1. By
allowing the interface to have a higher value (lower priority), static routes can take preference to
interfaces. For normal operation, leave this value unchanged.
MTU
The maximum transmission unit. In this text box you can enter the greatest amount of data that
can be transferred in one physical packet. The default value is 1400.
Include Tunnel Key
The interface normally uses this parameter with multi GRE (mGRE). The tunnel key adds an extra
field to the GRE header where a key number can be applied. When enabled, incoming GRE
packets must have a matching tunnel key number to be accepted by this tunnel. When enabled,
the IP address parameter is not required.
Enable the firewall on this GRE tunnel
Turns Firewall script processing on or off for this interface. If using the firewall for problem
detection on a tunnel interface, the interface to put OOS will need to be specified, such as:
pass out break end on tun n from any to 100.100.100.29 port=4000
flags S!A inspect-state oos ppp n 5
Enable GRE checksums
Selects whether to add GRE checksums to GRE packets when the router is terminating a GRE
tunnel. Set this parameter to off to disable checksums, and to on to enables checksums.
Enable IGMP on this GRE tunnel
This IGMP parameter enables or disables the transmission and reception of IGMP packets on this
interface. IGMP advertises members of multicast groups. If IGMP is enabled, and a member of a
multicast group is discovered on this interface, multicast packets for this group received on
other interfaces are sent out this interface.
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