Quote Originally Posted by toppshatta
.... my modem does not have a built in router its a typical usb/ethernet adsl modem (starbridge pyxis 210)
I haven't looked the modem up (a little busy now), but I have no idea what is going on or how any of what you report is happening if the modem does not include a router and if you are not running any PPPoE software. All I know says that should not work at all. I think you should do some research on the modem. Of course, if it does include a router that still doesn't solve your main problem. I think that is because your broadcast address makes no sense at all. But I would need a better understanding of your hardware to give you a certain answer. 10.xx.xxx.xxx addresses are not usually used with class C size nets, but based on the 10 address that you showed and the mask that you showed I would try a broadcast address of 10.0.0.255. It makes sense that you would have problems after a few minutes if the ARP protocol breaks down, which it would with a bogus broadcast address.