User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - IP Backbone network layout and
configuration
TetraFlex® 7.5
Manual
2-162
All interfaces in the router network that must be able to join in a multicast group must have
IGMP and PIM-SM enabled.
2.16.10.2.2.1 Multicast and VPN
As such VPN/IPSec does not support the transport of multicast packets. GRE tunneling
does support multicast routing but is not encrypted. Therefore the configuration shown at
end of this document the recommended configuration uses IPSec encrypted GRE
tunnels. Combining the IPSec and GRE will ensure the routing of both unicast and multicast
and still maintaining integrity and intrusion security of the network.
2.16.10.2.2.2 GRE tunneling
Generic Routing Encapsulation (GRE) is a tunneling protocol designed to encapsulate a wide
variety of network layer packets inside IP tunneling packets. The original packet is the
payload for the final packet. GRE was developed by Cisco and was designed to be stateless;
the tunnel end-points do not monitor the state or availability of other tunnel end-points. GRE
creates a virtual point-to-point link with routers at remote points on an IP internetwork.
2.16.11 Applicable tools for router programming
The Cisco offers a CLI Command Line Interface. This is accessible through the console
port of the router. Use the blue cable delivered with the router. In this case use the serial port
of your PC. You can use any of a variety of terminal emulation programs.
If you know the IP address of one of the Ethernet ports on the router you can also telnet
into the router and use the same CLI.
The configuration of any Cisco router can be exported from the router and onto a so called
TFTP server. The router configuration file is then an ASCII formatted text string. This can be
opened edited and saved by the use of any of a variety of text editor programs.
After editing the file can be re-imported to the Cisco router. After a reload of the router it
will reflect the newly introduced configuration changes that you made offline.
2.16.11.1 Ultraedit:
o A text editor program for offline editing of configuration files.
2.16.11.2 WordPad:
o A text editor program for offline editing of configuration files. Available typically in
Windows.
2.16.11.3 HyperTerminal:
o A Windows standard program that can do both serial communication and also
use TCP/IP to connect to router via Ethernet.
2.16.11.4 Putty:
o A very versatile program that does serial and IP connections.

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