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M2M Cellular Gateway
The gateway executes port forwarding transferring the E‐mail service requests to the
LAN servers and sends the replies from LAN servers to the requester.
The E‐mail server at LAN side is the server for E‐mail service.
Parameter Setup Example
Following table list the parameter configuration as an example for scenario ② in above
diagram. Please be noted that the E‐mail service includes SMTP and POP3 service ports.
Use default value for those parameters that are not mentioned in the table.
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.
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 remote user can access the E‐mail server in the gateway that has the global IP
118.18.81.33 at its WAN side. But the real E‐mail server is located at LAN side and the
gateway is the port forwarder for E‐mail service.
A virtual server rule can be integrated with a schedule rule. That means, the virtual
server rule can be activated only at the pre‐defined time schedule.
Virtual Computer List
"Virtual Computer" feature allows you to assign LAN hosts to global IP addresses, so that they can
be visible to outside world. While so, they are also protected by the gateway firewall as same as they
are protected when being client hosts in the Intranet. For example, if you set an FTP file server at LAN
side with local IP address 10.0.75.102 and global IP address 118.18.82.44, a remote user can access the
file server while it is hidden behind the NAT gateway. That is because the gateway takes care of all
accessing to the IP address 118.18.82.44, including to forward the access requests to the file server and
to send the replies from the server to outside world, as shown in scenario of following diagram.
Index skipping is used to reserve slots for new function insertion, when required.
[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
93
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