ping error 1231

Hi,

I'm setting up a wireless camera on an Unmanned Aerial Vehicle (UAV)

and need an ad-hoc network, this is because i have powerful amplifiers

at my pc and on the aircraft. A normal wireless network needing a

router would not have sufficient transmission range, as the router

signal would be a weak link in the chain.

Strangely, I can only access the camera over the ad-hoc network for

about 30 seconds, then the connection breaks down. Everything works

fine when connevcted through the router.

Trying to ping the camera's IP, I get "transmit failed, error code

1231"

Not quite sure what in earth to do. Please help!

Adam