hi, I am new to ixp1200...I am facing a problem understanding how the microengines transfer packets to the strong arm. I am working on a project using IXP1250 which has an IXF1002 connected .Now I am using L3Fwd2F reference project as my base project to write code for this board. My question is... 1)Is there any major modification to be done in the code to run a project written for a 64 bit bidirectional IXbus mode to make it run on 32 bit unidirectional IXBus mode?? 2)what exactly is the communicaton mechanism between the microengines and the core?What I have understood is that the receive thread creates a descriptor which contains info about which port to send the packet to,and then the transmit thread reads this descriptor and transmits the packet to the specified port.But in this case the port number is 18,then how does trasmit thread make use of this port 18.Please correct me if I am wrong. Thanks and regards Ravi Modgekar __________________________________________________ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/