wifi routing problem

I guess this is probably a very straightforward problem, but I can't
find references. Here's the
setup:

PC1 <-net-> AP <-Air-> Client <-net-> PC2 <-net2-> PC3 ...

PC1, AP, Client, (left side of) PC2 are members of the same net (net1)
(right side) PC2, PC3 are in another net (net2).

AP and Client are Wifi routers (Edmax), one as Access Point, the other
as client.

PC2 has two NICs, and has forwarding enabled...

The Problem(s) (this are just a few of the strange things):

1) I _can_ connect (ssh) from PC1 to (left side of) PC2 (but not right
side)
2) I _can_ then connect to PC3
3) I then _cannot_ ping back to PC1, _unless_ I try to connect from
PC1 o Client (say a telnet
ftp, or http to Client's webpage). Then the ping starts working.
4) If I leave the ping working, the net stays up, else it blocks after
a small period, and I
have to do another 'wakeup' connection to Client.

I am guessing there is a problem with ARP, but I can't figure it out.
Pinging from, I find
that Client is giving its MAC instead of (left side)PC2, so Client
seems to have
Proxy ARP enabled (the Client's webinterface doesn't permit checking
or changing
that).

Can someone either give some hints, or point me to somewhere I can
find how
to configure correctly this type of connection. It's difficult to
describe the
problem here...

Thanks
John

On May 4, 6:09 pm, john.copp...@gmail.com wrote:
> It's difficult to describe

Maybe the drawing at http://jcoppens.com/misc/net_topo.png clears up
things a little.
It also shows the relevant entries of the routing tables.

John