peplink Balance 30 - 10.4.1 Routing under GRE via Network Address Translation (NAT)

PePLink Balance Series v4.0 User Manual
Page 41
10.4.1 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:
RouterPePLink Balance
GRE Router
WAN IP Address
172.23.2.123
WAN Default
Gateway
172.23.2.122
Remote GRE
Host
172.23.254.87
Tunnel Local IP
Address
192.168.128.222
Tunnel Remote IP
Address
192.168.128.223
192.168.1.1
PePLink
Balance
Outgoing NAT IP
Address
210.103.22.1
Private
IP Network
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: