[TriLUG] IPTables throughput limitations?

[Jeff Bollinger]

I have found a few threads online about this, but can anyone speak to 
the throughput limitations of an IPTables firewall/router (i.e., linux 
box + iptables + 2 NICs)?  I know it depends on the strength of the 
hardware and the complexity of the rulesets, but what are some of the 
larger throughputs you've seen pass through a strictly IPTables firewall?

Thanks,
Jeff