Internet Sharing - Mobile Broadband to Vista via Ethernet

Hi,
I am connected to the web via a USB mobile broadband dongle (HUAWEI). I have an external IP address that I can see via websites, but the USB dongle actually reports via System Preferences a private address (normally 10.5x.x.x). Not a problem so far, the net works and all is good.
I now wish to share this connection over ethernet with a Windows Vista machine over ethernet, but am having problems. I turn Internet Sharing on set to share connection from "HUAWEI Mobile" to computers using "Ethernet".
The Windows machine gets an IP address (in the 192.168.2.x range), and can ping me, and I can ping that machine. The Vista machine can even use DNS ok, but it cannot ping any internet IP, nor connect via HTTP or SSH to the outside world.
If I share the internet via Airport, my iPhone can pick it up and use it to access the internet just fine.
My Firewall is set to allow all incoming connection. In Network, I have tried ethernet as set to DHCP (it gets a self assigned IP in 169 range, and ifconfig also reports the 192 IP) and turned off, with no difference.
Any suggestions? Either a solution or some tests I could try to narrow in on the problem.
On a sidenote - is it normal for Internet Sharing to use two different private address ranges for sharing via different connections? Over Airport it uses the 10.x.x.x range and over ethernet the 192.x.x.x range. Can I change this somewhere?
Many thanks in advance!

my iMac unfortunately is running 10.6.8

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