Ok, so I have configured a little differently. I use the on-board
WRT54G as an access point as you do, but also use the NAT/DHCP
services in it and I bring in the Wireless Client in through the WAN
port.

Yes, if you're actually using a wireless client device then you'd be wise to
think about the firewall issues. Good setup.

I though about configuring as you have, sure would have solved the
access issues to the Shorelink / Wireless Enternet device I am having,
but I could not see a way to keep a firewall. With your
configuration, is there a firewall in your shorelink / Wireless
client, or somewhere else? Does the open Firmware retain that
capability even when running in Shorelink / Wireless Ethernet mode?

When I use my shore-link unit it's acting as a gateway so it's firewall
features are preserved. So the shore sees my client as a single connection.
Then all traffic is routed through that same WRT54GS using it's firewall
features. The on-boat network is just an access point. The dd-wrt firmware
handles all this without much configuring at all.

-Bill Kearney