User's Manual

Avaya Branch Gateway Manager 10.0 Page 382
15-601011 Issue 29r (Friday, November 02, 2012)B5800 Branch Gateway
5.19 Tunnel
Tunneling allows additional security to be applied to IP data traffic. This is useful when sites across an
unsecure network such as the public internet. The system supports two methods of tunneling, L2TP and IPSec.
Once a tunnel is created, it can be used as the destination for selected IP traffic in the IP Route table.
The use of tunnels is not supported by Linux based systems. On other systems two types of tunneling are
supported:
· L2TP - Layer 2 Tunneling Protocol
PPP (Point to Point Protocol) authentication normally takes place between directly connected routing devices. For
example when connecting to the internet, authentication is between the customer router and the internet service
provider's equipment. L2TP allows additional authentication to be performed between the routers at each end of
the connection regardless of any intermediate network routers. The use of L2TP does not require a license.
· IPSec
IPSec allows data between two locations to be secured using various methods of sender authentication and or data
encryption. The use of IPSec requires entry of an IPSec Tunneling license into the system at each end.
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