Cisco's web site has a Miercom report http://www.cisco.com/application/pdf/en/us/guest/products/ps5854/c1244/cdcco... that tested a bidirectional UDP flow between two 10/100 ports, with big IP packets, firewall and NAT running and logging turned on, and they got 130 Mbps. Your mileage may vary, depending on what a "50 Mbps fibre link" is and what hardware and protocols you're using to support it (ATM? 51 Mbps SONET channel on OC3? Some kind of fiber Ethernet device?), and if you're using only 10/100 Mbps Ethernet cards, you'll want to enable full duplex if you can. Presumably a real application is much faster, if you don't need all the firewalling and NAT services. ---- Thanks; Bill Note that this isn't my regular email account - It's still experimental so far. And Google probably logs and indexes everything you send it.