Table of Contents
Advertisement
M2M Cellular Gateway
Scenario Application Timing
Without the need of reconfigure their PC each time, the employee from inside or
outside the office can access enterprise servers. So network administrator must activate
the "NAT Loopback" feature to do that.
Scenario Description
Local user can access mail server by FQDN or global IP when NAT loop back is enable.
Global user can access mail server only when mail server is set as virtual server of the
gateway.
Parameter Setup Example
Following 2 tables list the parameter configuration as an example for above diagram of
gateway with "NAT Loopback" feature activated.
Use default value for those parameters that are not mentioned in these tables.
Configuration Path
NAT Loopback
Configuration Path
ID
Public Port
Server IP
Private Port
Rule
Scenario Operation Procedure
In above diagram, the Gateway is the gateway of Network‐A and the subnet of its
Intranet is 10.0.75.0/24. The gateway has the IP address of 10.0.75.2 for LAN interface
and 118.18.81.33 for WAN interface. It serves as a NAT router.
Activate the NAT Loopback feature on the Gateway.
Define the E‐mail virtual server to be located at a server with IP address 10.0.75.101 in
the Intranet of Network‐A, including SMTP service port 25 and POP3 service port 110.
So, the local user at host with IP address 10.0.75.100 can access the E‐mail server by
using the global IP 118.18.81.33. But in reality the E‐mail request packets from the local
host will not reach the WAN interface, but just loop back to the E‐mail server in the
Intranet.
The NAT Loopback allows user to access the WAN IP address from inside your local network.
Enable NAT Loopback
Go to Basic Network > NAT / Bridging > Configuration tab
Index skipping is used to reserve slots for new function insertion, when required.
[Configuration]‐[NAT Loopback]
■ Enable
[Virtual Server & Virtual Computer]‐[Virtual Server List]
1
25 (SMTP)
10.0.75.101
25 (SMTP)
■ Enable
2
110 (POP3)
10.0.75.101
110 (POP3)
■ Enable
119
Advertisement
Table of Contents
