WAG54G Routing

[DukeSSD]

I have a WAG54G with a few PC's wired to it and a WET54G on the wireless link with a few PC's wired to it.
All the PC's can access the web.
The machines at the WAG end can all talk.
The machines at the WET end can all talk.
The WAG machines cannot see the WET machines.
The WET machines can not see the WAG machines.
All on the same class C network.
Sounds a bit like a routing problem to me but I can not make sense of the WAG Advanced routing setup.
Any ideas ?

 

[DukeSSD]

Sorry, by "see" I mean ping, etc.
I cannot even ping between wired and wirelessly linked machines.
The OS's are a mixture of Windows.
If I move a machine from the wired to the wireless link the problem is the same, it can then only see the local machines and the web.