Hi Doug, Both machines randomly choose a self-assigned IP address, so there's no problem with them connecting. There is a *very* slight chance they will choose the same address, but if they do, one of the machines will recognize that the IP address is in use and will change its address to give it a unique address. smiles, Jamie On Sep 19, 2006, at 10:53 AM, Doug McNutt wrote: > At 10:42 -0700 9/19/06, Harry Freeman wrote: >> This is because most modern platforms have an ethernet port that >> detects if the other end is DTE or DTC and makes an adjustment to >> be what is necessary. > > Does anyone know how a logical collision is prevented when two > machines connected as such are turned on at the same time?