HELP: Can't Get G5 Quad to Share Internet of Dual Gigabit Interface

Question

I just got (yesterday) a G5 Quad with the dual Gigabit ethernet connections and I am trying to share my network connection through the Quad (no more ports available on my switch).
- I am connecting the Quad (en0) directly to a Gigabit Switch and get ip 192.168.2.191
- I connect a G4 Dual 500 to the Quad (en1).
In Network utility, the Quad on en1 and the G4 show ip 192.168.2.1 (which is the IP of my router)
When I try to connect to the internet via the G4, Safari just sits there. No error page, just the spinning lollypop.
When I connect the G4 directly to the switch, instant access.
My settings on the Quad are as follows:
Sharing/Services:
Personal File Sharing, Personal Web Sharing checked, all others not checked.
Sharing/Internet:
Share your computer connection from: Built-in Ethernet 1
To computes using: Built-in Ethernet 1 not checked, Built-in Ethernet 2 checked;
Unfortunately, I have no available spots on the switch, and was hoping I could use the secondary port on the Quad to File/web share one more Mac.
Any help or suggestions would be greatly appreciated.
Dual G5 2GHz, 2.5 GB RAM, 360 GB HDD   Mac OS X (10.4.2)  

Answer 1

Did you happen to allow enough time for a power recycle when switching the router connected to your DSL modem?
Modem/Router Power ReCycling
- Power-off the DSL/Cable modem, Internet Router, & computer(s). (Wait at least 30 minutes. If possible, leave the modem off overnight.)
- Power-on the DSL/Cable modem; Wait at least 30 minutes.
- Power-on the Internet Router; Wait at least 5 minutes.
- Power-on the computer(s)