Hi, I want to do some experiment and study about OSPF protocol. Here is a simple topology: +------+ +------+ | RT1 | Interface 1 | RT2 | | |----------------------------------------| | +------+ Interface 2 +------+ However I just have one computer, so I wondered can I simulate 2 routers on one computer? Using each Ethernet Interface for one router: +-------------+Interface 1 | RT1 |-------------------------- | | | |---------------| | | RT2 |-------------------------- | |Interface 2 +-------------+ If BIRD supports multiple processes running, maybe this simulation would be possible. But when I try to do this, the operating system says another BIRD is already running. Any ideas? Thanks!