Very Slow Internet Connection with Leopard Server

I have build a new Leopard Server on a Dual G4 867 box, 1.38GB RAM, 10M external Ethernet Card on WAN side into ADSL router on 2Mbit/s connection where we have an 8 IP address range, nothing else contending for the bandwidth.
When I down load a file using my Leopard client directly on one of our external WAN IP ports, I get maximum throughput from the links of the order of 200kBytes/sec. When I use the same client working through the Leopard Server, which is acting as a NAT firewall router, I get throughputs of less than 1/20th of that, e.g. 10kBytes/sec or less.
I monitored the Leopard Server and it is under utilised in terms of CPU, RAM, disk I/O, port thruput, etc. I have also checked Activity Monitor and the whole machine is barely idling on resource usage, yet the throughput is abysmal.
Can anyone give me any clues as to why this might be? Any thoughts on what else to check?

http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=6&PFid=6&Le vel=5&Conn=4&DownTypeID=3&GetDown=false
They don't seem to have a 10.5 driver listed but Apple may have included one in Leopard (as in previous Tiger and Panther). You just "plunked" the card in?
It does seem Apple has done some major overhaul when it comes to (ethernet) drivers as they now supports flow-control also at 10/100 Mbit. You have the interface (duplex) set to autonegotiate?
Also my older Belkin (Broadcomm chip) "AirPort" PCI card only seems to be "semi supported" under Leopard as it is now reported as thirdparty but under Tiger it was udistingushable from a regular AirPort Extreme card.
Maybe an update will fix this?
Having said that the Realtek based cards isn't really know as the best working/quality ones.
I have some older 10/100 Asanté cards laying around and a cheap Realtek 8169 (gigabit) based card I havent tried yet.
I also noticed a soon two year old Intel iMac I got recently has a Marvell based ethernet interface so maybe other Marvell based cards would work in Macs (haven't really looked at what's present in Leopard driver wise). Marvell seems to get good reviews on Internet (SysKonnect cards). This iMac for example supports Jumbo frames and VLAN.

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