Netopia 3300-ENT Series, Firmware User Manual

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Virtual Private Networks (VPNs) 5-11
About GRE Tunnels
Generic Routing Encapsulation (GRE) protocol is another form of tunneling that Netopia routers suppor t. A GRE
tunnel is brought up when a valid GRE profile is installed, and brought down when the profile is disabled, or
deleted.
GRE tunnels are not connection-based , but rather are installed and simply wait for GRE packets. There is no
special star tup initiation as with PPPoE or PPTP. GRE is best adapted to simple routing and/or tunneling, and is
not for use with any sensitive data. GRE offers no encr yption; and authentication of data integrity is limited to
checksum verification, if enabled.
To set up a GRE tunnel, you create a Connection Profile including the IP address and other relevant information
for the remote par tner.
When you define a Connection Profile as using GRE by selecting GRE as the Encapsulation Type, and then
select Encapsulation Options , the GRE Tunnel Options screen appears.
Main
Menu
WAN
Configuration
Add Connection
Profile
Add Connection Profile
Profile Name: Profile 2
Profile Enabled: +-------------+
+-------------+
Encapsulation Type... | PPP |
Underlying Encapsulation... | ATMP |
| PPTP |
Encapsulation Options... | IPsec |
| L2TP |
| GRE |
IP Profile Parameters... +-------------+
Interface Group... Primary
COMMIT CANCEL