User manual

A bridged GRE tunnel is useful for transmitting packets across a VPN connection that
would normally be dropped by IP routing. This includes broadcast packets, multicast
packets and any non-IP protocol such as IP v6, IPX, or Apple Talk.
Adding a GRE interface
Under the Network Setup > Connections table, select GRE Tunnel and click Add.
Ensure Enable is checked and enter a descriptive GRE Tunnel Name for this tunnel.
Enter the address of the remote GRE endpoint in Remote Address, e.g., the Internet IP
address of a remote SnapGear unit.
Enter the address of the local GRE endpoint in Local Address. This is typically a free
address on your main LAN. If your LAN connection has an alias address, it may also be
a free address on the alias network.
Select a Firewall Class for the GRE interface. This setting is discussed in the Direct
Connection section towards the beginning of this chapter.
Click Finish. The GRE interface now appears in the main Network Setup table.
GRE over IPSec
The basic steps to set up GRE over IPSec are:
1. Use the same network for the primary IP addresses of the LAN interfaces at both
ends of the tunnel.
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Network Setup