APPLICATION NOTE
AN0015
PORTAL PLUS COMMUNICATION USING 3G
Page 3 of 8
www.videxuk.com
29/03/2018
Once all settings have been entered, check the main router status page to check if the router has a connection
to the internet. This can be confirmed by a blue flashing ‘Cell’ light on the front of the router. It should also
be possible to browse the internet on the PC connected to the router making use of the 3G connection.
PORT FORWARDING
This is the process by which you can ensure efficient connectivity between outside servers and devices and
resources connect to the LAN side of the router.
Select ‘Firewall’ in the menu and then ‘Port Forwarding’. On this page select ‘Enable’.
Add the two port forwarding rules as shown above. The first rule named ‘Portal’ is the IP address of the Portal
Plus EWS controller which we will connect to the system later. Any data coming in on port 4001 (WAN) will be
forwarded to the device 192.168.8.2 on port 4001 (LAN).
The second rule is to prevent any DNS amplification attacks. These attacks could lead you to unknowingly
take part in denial of service attacks on third parties and could incur a large bill for data usage. As the router
has no option to switch off the DNS resolver, we can forward any DNS requests to an IP on the LAN which
does not exist and in effect disabling the DNS resolver.
