IWol for iPhone problems

Question

I am trying to use this app for iPhone that lets me turn on my computer when it's off or in sleep mode from my iPhone. It uses the wake on lan standard. It's very awesome when it works. Here it is in the appstore: http://itunes.apple.com/us/app/iwol-wake-on-lan/id286568674?mt=8 and here is the webpage of the app: http://www.sk4.co.uk/index.php?option=com_content&task=view&id=15&Itemid=8
I entered the MAC address in the app and turned lan broadcast on and it works every time! It turns on my computer when it's off or in sleep mode. The problem is it doesn't really work when my iPhone is not connected to wifi (wifi from my router only). So I followed the instructions on the site that say I have to forward the incoming requests for port 7 (UDP) to the IP address of the computer I want to turn on. And after many hours I figured out how exactly I do this and I did it it works and now I can turn on my computer from my iPhone when I'm on 3G, but it only works if and only if the computer was recently turned off or put in sleep mode (last 5 minutes or so). This is very weird and I have no idea how to fix this. Anyone have any idea?
Here is how I set up my port forwarding: http://i.imgur.com/P5ttB.png

Answer 1

I think I just discovered the problem. I discovered my problem in the documentation of another app for iPhone that is similar http://www.bananaglue.de/wol/help/WOL%20Setup%20Guide.pdf
On the last page at 2.7 common problems:
2.7 - Common problems
It happens that some routers forget the entered port forwarding setup after a short while
(10 to 45 minutes). In this case you have to setup static routing in your router (contact your
router dealer and ask how to do this). This means that the routing works after the router did
update its ARP table ( and so did „forget“ about the device IP it should forward the wake on
lan „magic packet“ to)
So how do I set up static routing in my verizon router? It's a westell model A90-9100EM15-10.