Problems with Symbol Wireless Switch

I am trying to set up this WS-5100 switch.

LAN on ETH2. 192.168.9.123/255.255.255.0
gateway 192.168.9.3


WLAN on ETH1. 192.168.31.20/255.255.255.0
Gateway : 192.168.31.1

I can see (ping https) switch fine from wired LAN. But can not ping
anything on wireless side of switch.

I can ping adrress on ETH1 from wireless network but can not access
anything on wired network.

I saw in manual that both ports need to have the same gateway. It also
says that ETH1 and ETH2 can not be in the same broadcast domain.

If I try to put the "real" gateway in for the 192.168.31.x the switch
locks-up.

If I try to give both ports 192.168.31.x addresses, the switch
locks-up.

thanks.

dc