Configuring Internet Sharing for other devices

I have set up Internet Sharing on a MacBook Pro. I am sharing the laptop Wifi connection over ethernet. If I connect a Mac to the laptop with ethernet, the sharing works fine--the Mac gets a DHCP address and is on the internet. However, what I am wanting to do is give an ethernet peripheral device an internet connection in this manner, and I can't get it to work. The periperal device will connect correctly if I give it an ethernet connection directly on my LAN, but for some reason the ethernet connection provided by the laptop doesn't work.
On the laptop, (WiFi IP 192.168.1.166, Router 192.168.1.1, DNS 192.168.1.1) I have given the ethernet port a static IP of 192.168.2.1 and a subnet mask of 255.255.255.0. I have tried with the Router and DNS populated and unpopulated.
From a packet dump in terminal it looks like the device makes a DHCP request, but nothing sends a DHCP reply, wheras when the Mac connects, the laptop sends a DHCP reply.
Does anyone know what I'm doing wrong, how to fix this, or how to check the log for Internet Sharing to see if I can see anything helpful there.
Thanks
Doug

I may have found a solution, but does anyone know if this 10.5 bug has been fixed by Apple? This was posted on an XBox forum as a workaround to the same proble--internet sharing not working with other devices:
10.5:
The following procedure is confirmed to work as written.
Start Internet Sharing if it's not already running.
In Terminal, type cp /etc/bootpd.plist /tmp/bootpd.plist
Stop Internet Sharing.
Open /tmp/bootpd.plist for editing using TextEdit or whatever.
Locate this section of the file, near the end:<key>reply_threshold_seconds</key><integer>4</integer>
Change the value 4 to 0.
In Terminal, type sudo cp /tmp/bootpd.plist /etc
Start Internet Sharing.
If you want to, check that your change to /etc/bootpd.plist hasn't been reverted.
So my question now:
Will this fix the issue in 10.6 or is there something else going on?
Doug

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