User Manual

USER MANUAL

Peplink Balance Series

11.1.4.1 Routing under GRE via Network Address Translation (NAT)

The following figure shows a typical scenario with Peplink Balance under the GRE connection mode and

NAT routing mode:

In this scenario, the IP address settings are as follows:

 WAN IP Address: 172.23.2.123

 Default Gateway: 172.23.2.122

 Remote GRE IP address: 172.23.254.87 (GRE router or host’s IP address)

 Tunnel IP remote address: 192.168.128.223 (IP address of remote end of tunnel)

 Tunnel IP local address: 192.168.128.222 (IP address of local end of tunnel)

 Outgoing NAT IP address: 210.103.22.1 (This field is used for NAT routing mode only. For all

outgoing traffic, the IP datagram will be sent via this IP address through the tunnel; as a result,

the Outgoing NAT IP address is the public address that is seen by all external hosts on the WAN.)

The following figure shows the packet flow for Peplink Balance under GRE connection mode and NAT

routing mode: