Ok Interesting one here
System was all set up and appears to work ok, the network comprises of 4 wireless clients, and 1 'occasionally' hard wired client (laptop). All clients connect to the Cisco Router, and gain the internet through the routers connection to the Virgin modem.
However there are some idiosynconies (if thats how its spelt)
1. If the only 'hard' wired conenction is not connected. None of the wireless clients seem to have access to the internet. allthough they report there connection to the router is fine. Only by plugging the wired pc in do we get internet.
2. Occasionally, we have total loss of the internet, again we seem to connect to the router ok, just that the router looses the connection to the virgin modem. This reason is totally unknown. we have to pull the plug on the virgin modem and plug it back in for the router to gain DHCP, only for it to loose it again a little while later. I'm not sure why this is happening.
I know virgin 'cabled' modems only ever give out 1 IP, so once its given out that it wont service anymore DHCP requests. but as far as i can tell, i dont know why the cisco router would drop its WAN IP and ask for another. if this is indeed whats going on.