simulating an LFN over 1Gb LAN Ethernet?

[Heinz Knocke]

Hi!

I'd like to simulate an LFN over LAN - my idea is to install testing software on 2 hosts, traffic between them would be routed by the 3rd one - a FreeBSD based router. To simulate long RTT the router would have to delay packet forwarding in at least one direction - does anyone know how to do it? Is it at all possible withou some changes in kernel source code? 

hk