F5D6130 as AP Client

AP1: Setup in ap mode ethernet port connected to router that is
connected to internet. Also another pc1 is connected to the router.

AP2: Connected to ap1 in ap client mode and to pc2 via ethernet port.
Internet works great.

AP3: Connected to ap1 in ap client mode and to pc3 via ethernet port.
Internet works great.

The problem is that pc1 can not ping pc2 or pc3 and visa-versa. Either
pc can ping ap1, ap2 or ap3. No pc can ping any other pc. It's like
traffic from one pc to the other is stopped at the ap. I want to share
a printer with all pcs. However the way things are I can't. Why
can't pc1 ping pc2 or pc3 ping pc1 etc, etc etc?