Siemens gigaset SE551 Owner's Manual page 123

You can start remote management by entering the public IP address in your Internet
browser. As Internet providers often change this each time you dial in, it is worth using
dynamic DNS (see page 93) in addition.
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You can change the Port via which you can access the configuration program from
the Internet, for example in order to hide and protect the configuration program
against unauthorised access.
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Allowed connections: You can specify one particular PC for Remote Management
or permit this function for any PCs. Select the required option from the list.
Please remember:
If you permit several PCs then anyone who finds out your password can access this
user interface and therefore also your network! If it is needed, then you should
only activate this option for a short time.
Remote Management for one particular PC:
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In the Authorized client field, enter the IP address of the PC that is to have access
to the user interface of the Gigaset SE551 WLAN dsl/cable from outside your local
network.
Please remember:
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The Internet provider might assign the IP address to the PC dynamically.
This can then change the IP address. Make sure that the PC that is to access
the router from the Internet always has the same IP address.
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For access to the configuration environment via Remote Management, you
must enter in the browser the address of the Gigaset SE551 WLAN dsl/cable
to be managed using the following format: http://X.X.X.X:8080
(x.x.x.x stands for the IP address of the Gigaset SE551 WLAN dsl/cable).
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Click OK to accept the settings.
Administration and status information
121