Configuring The Tunnel's Ip Address; Configuring The Tunnel Key; Specifying Tunnel Traffic - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

Configuring a Tunnel with Generic Routing Encapsulation
Configuring GRE

Configuring the Tunnel's IP Address

The IP address for the tunnel interface places the tunnel in a local network.
To configure the address, enter this command from the tunnel interface
configuration mode context:
Syntax: ip address <A.B.C.D> <subnet mask | /prefix length>
The tunnel's IP address determines what traffic crosses the tunnel. For
example, routing updates cross the tunnel when you enable the routing
protocol on the network for the tunnel.
For the tunnel in Figure 9-1 on page 9-5, you would specify this IP address on
Router A:
ProCurve(config-tunnel)# ip address 192.168.10.1 /30

Configuring the Tunnel Key

The tunnel key defines the traffic that makes up a tunnel as it passes through
the intervening network. The key is inserted into a packet's GRE header and
marks the packet as part of the tunnel. The key provides minimal security and
ensures that the tunnel only carries the traffic it is configured to carry
(particularly when more than one tunnel has been established between the
same two addresses).
You configure the key from the tunnel interface configuration mode
context. Enter:
Syntax: tunnel key <key>
For example:
ProCurve(config-tunnel 1)# tunnel key 1234
A valid key is any number from 1 to 4294967294.

Specifying Tunnel Traffic

The router encapsulates any traffic that arrives on the tunnel interface and
sends it to the remote tunnel endpoint. You can select the traffic that accesses
the tunnel by ensuring that the router forwards traffic through that interface.
9-7