User`s guide

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MTU:
Maximum Transmission Unit. The value entered here will be the greatest amount of data
that can be transferred in one physical packet. Default value is 1400
Tunnel Key:
Normally used with multi GRE (mGRE), the tunnel key adds an extra field to the GRE header
where a key number can be applied. When used, incoming GRE packets must have a
matching tunnel key number to be accepted by this tunnel. When the Tunnel key parameter
is used the IP address parameter is not required.
Enable the firewall on this GRE tunnel:
The Firewall parameter is used to turn 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, e.g.:
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:
This parameter selects whether to add GRE checksums to GRE packets when the unit is
terminating a GRE tunnel. “Off” disables checksums, “On” enables checksums.
Enable IGMP on this GRE tunnel:
This IGMP parameter is used to enable or disable the transmission and reception of IGMP
packets on this interface. IGMP is used to advertise 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 will be sent out this interface.
Enable IP analysis:
When set to ON, the un-encapsulated IP traffic will be captured into the analyser trace.
Enable Tunnel analysis:
When set to ON, the GRE encapsulated packets and keepalives will be captured to the
analyser trace.
Related CLI Commands
Entity
Instance
Parameter
Values
Equivalent Web Parameter
tun n metric
Numeric Metric
value
Metric for the route associated
with this interface
tun n MTU MTU value Maximum transmission unit size
tun n tunkey Key number Key number
tun n Firewall on,off Turn firewall on or off
tun n csum on,off Enable GRE checksums
tun n igmp On, off Enable IGMP packets
tun n ipanon On, off
Enable IP analysis for traffic on
this interface
tun n tunanon On, off Enable GRE tunnel analysis
RIP Routing Parameters – CLI only