6.6 Public access across the Internet where an external email
server is used
This scenario involves sending email via an email server that is not on the private network (LAN).
Instead of using a local email server, it is sometimes possible to use an external email server such as those
provided by an ISP.
Using “Site A” as an example the configuration settings for the ipGateway would be:
All other configuration settings can be left as default.
6.6.1 Configuration elsewhere on the network
6.6.1.1 Router NAT (Port Forward)
In addition to the ipGateway configuration, a NAT (Port Forward) will need to be setup on the router
(192.168.0.4) to provide an external to internal address translation, i.e.
This will allow a user on “Site B” to type the following into the address bar of his browser to gain access to the
ipGateway at “Site A”:
http://74.125.230.148
6.6.1.2 Email Server
The email server must be configured to allow “Email Relaying” from IP Address 192.168.0.100 (i.e. the
ipGateway). This can be done by contacting the owner of the remote email server (i.e. the ISP).
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