Adder Technology Networking issues, Positioning AdderLink IP in the network, Port settings

Networking issues

Thanks to its robust security the AdderLink IP offers you great flexibility in how it integrates into an existing network structure. The AdderLink IP is designed to reside either on an internal network, behind a firewall/router or alternatively with its own direct Internet connection.

Positioning AdderLink IP in the network

Every network setup is different and great care needs to be taken when introducing a powerful device such as the AdderLink IP into an existing configuration. A common cause of potential problems can be in clashes with firewall configurations. For this reason the AdderLink IP is designed to be intelligent, flexible and secure. With the minimum of effort the AdderLink IP can reside either behind the firewall or alongside with its own separate Internet connection.

Internet Internet

Placing AdderLink IP behind a firewall

A possible point of contention between the AdderLink IP and a firewall can occasionally arise over the use of IP ports. Every port through the firewall represents a potential point of attack from outside and so it is advisable to minimise the number of open ports. The AdderLink IP usually uses two separate port numbers, however, these are easily changeable and can even be combined into a single port.

IMPORTANT: The correct configuration of routers and firewalls requires advanced networking skills and intimate knowledge of the particular network. Adder Technology cannot provide specific advice on how to configure your network devices and strongly recommend that such tasks are carried out by a qualified professional.

Port settings

As standard, the AdderLink IP uses two ports to support its two types of viewer:

•Port 80 for users making contact with a web browser, and

•Port 5900 for those using the VNC viewer.

When these port numbers are used, VNC viewers and web browsers will locate the AdderLink IP correctly using only its network address. The firewall/router must be informed to transfer traffic, requesting these port numbers, through to the AdderLink IP.

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KVM link to host system

Firewall/ router

Local network connection

Firewall/ router

Local network connection

KVM link to host system

When a web server is also on the local network

Port 80 is the standard port used by web (HTTP) servers. If the AdderLink IP is situated within a local network that also includes a web server or any other device serving port 80, then the HTTP port number of the AdderLink IP must be changed.

When you change the HTTP port to anything other than 80, then each remote browser user will need to specify the port address as well as the IP address. For instance, if you set the HTTP port to ‘200’ and the IP address is ‘192.168.47.10’ then browser users will need to enter:

http://192.168.47.10:200

(Note the single colon that separates the IP address and the port number).

The firewall/router would also need to be informed to transfer all traffic to the new port number through to the AdderLink IP.

If you need to change the VNC port number

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AdderLink IP situated	AdderLink IP situated
behind the firewall	alongside the firewall

IMPORTANT: When the AdderLink IP is accessible from the public Internet or dial up connection, you must ensure that sufficient security measures are employed.

If you change the VNC port to anything other than 5900 (or 80), then each VNC viewer user will need to specify the port address as well as the IP address. For instance, if you set the VNC port to ‘11590’ and the IP address is ‘192.168.47.10’ then VNC viewer users will need to enter:

192.168.47.10::11500

(Note the double colons that separate the IP address and port number).

The firewall/router would also need to be informed to transfer all traffic to the new port number through to the AdderLink IP.

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