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depends on the implementation of the NAT server (generating additional Public IP's that direct to specific internal IP's and such are not typically used in the home). NAT in a standard home router has the most simple implementation of NAT, and can't really be turned off (you can disable extra features bound to NAT, but it is still performing translations if you are using it to give out IP's different than the WAN IP).
Basically, what they are saying is to strip your network to it's minimal components, like bypassing your device that is performing NAT (ie: not going through your router and connecting directly to your cable/DSL modem, as that is usually set up as a direct pass-through unless you have leased additional IP's). This restricts any translation to it's most minimal usage (basically, you are efectively DMZ'ed and all inbound traffic is going to that one system, regardless, as it is the only endpoint available).
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Hi, all sorry for delay in reply, The services are set up and my ISP confirmed ports not blocked, i have however noticed its always exactly 12 hours after the original start up time, this seems to be when my Wireless LAN IP renews its lease, i do not currently have time to disable the bridges i have setup for virtual boxes, but will try this later today when i get back from work. disconnect issues are happening at 16:09 and 04:09 at the moment. and from what i observed if i restarted at this moment in time it would begin occurring at 07:40 and 19:40. i will post an update later today, hopefully i can test it before it renews this afternoon.
Edit: i will also try connection through wired interface. Tomorrow.