SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 84 (160)
Once the right to use a SW option has been authorized by means of license installation, the SW
functionality can be enabled using the appropriate CLI command (as explained in the following
subsections).
Example:
# ip pep enable [redirect|trans|httpa]]
The CLI help function for the different SW options requiring licenses (e.g.
? ip pep) will
not be available unless the SW option is authorized by installing the necessary license key.
SW options that are enabled on a model by default like e.g. QOS-4 and RAC on the
SatLink 1910 will not be displayed on the printout from the CLI command
sw show.
18.1 Generic Routing Encapsulation (GRE) and IP Tunnelling
The STM SatLink VSAT supports configuration of one IP tunnel from its DVB (Satellite) interface with
Generic Routing Encapsulation (GRE) as specified in RFC 2784. Only the tunnel destination IP address
and the subnet to be tunnelled need to be specified when setting up a GRE tunnel over the SatLink
network since the GRE tunnel by default will apply the reachable DVB interface IP address as the tunnel
source IP address.
A GRE tunnel can also be used to extend a VLAN across the SatLink network. Please see section 18.6 for
a description of how this is done.
Example:
#ip gre add 192.168.1.0 255.255.255.0 10.20.1.1
This will set up a GRE tunnel with the DVB interface IP address as the tunnel source and the IP address
10.20.1.1 as the tunnel destination. The GRE tunnel will accept traffic for the subnet
192.168.1.0/255.255.255.0.
To verify that a GRE tunnel and a GRE interface have been created, use the CLI command
ip gre
show.
Example:
# ip gre show
GRE Tunnel Interfaces:
----------------------
If Tunnel Local Address Tunnel Remote Address
4 192.168.255.2 10.20.1.1
Interface number 4 has been allocated for the GRE interface. Use the CLI command
ip show to verify
that a new IP interface has been created and that two entries have been added to the IP routing table. One
entry is used to route traffic with the destination address equal to the tunnel destination IP address to the
DVB interface, e.g. the GRE tunnel packets themselves. Another entry is used to route traffic with
destination addresses belonging to the GRE tunnel subnet into the GRE tunnel. Traffic arriving through
the GRE tunnel is routed to the applicable interface.
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