Self assinged IP address when going thru a Workgroup HUB

Hello
Thank your for reading this post.
This is my set up: (Please keep in mind I have only modest networking exp. but I was told this hub would be fine. We used to use it (previously we had 2 discrete IP addresses however, but I thought a HUB could split a single address as well. Do I need to configure the imac’s network preferences?)
Cable modem
|
|
Workgroup Linksys Hub
|_______________wired imac connected with LAN cable
AirportExpress _ _ _ _ |
|
|
MacBook Pro
The MacBook Pro can get online in any configuration (including when the modem cable is going into the uplink port on the HUB. The imac on the other hand is wired to the HUB but cannot connect because - according to Network Preferences I am using a self assigned IP address.
Any idea what I need to do...

I thought a HUB could split a single address as well.
Sorry, but no. The configuration you are using will not work as you intended. If you need to share the cable modem's single Ethernet connection with multiple (wired/wireless) computers you will need a wireless router with a built in Ethernet switch, like the 802.11n AirPort Extreme Base Station (AEBSn) or models from other vendors. Although your AirPort Express Base Station (AX) is a wireless router, it's Ethernet port is only enabled when the AX is configured as a relay/remote base station in a Wireless Distribution System (WDS.)
Another option would be to connect the AX directly to the cable modem and then acquire a wireless upgrade for the iMac.

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