<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"> <title></title> </head> <body> Tony Arnold wrote: <blockquote type="cite" cite="mid45C4929B.2010404@manchester.ac.uk"> <pre wrap="">Bruce, Bruce wrote: </pre> <blockquote type="cite"> <pre wrap="">Greetings, I'm working toward building up a couple of test fixtures that require me to generate multiple channels of Ethernet traffic. I have some Perl code that will allow me to send and receive traffic using specified local and peer ports. I seem to have only one problem that is preventing me from getting started. Linux is optimizing all my traffic to go through the default port. To be more specific, let's assume I have a 8 port switch to be tested. Assume I have two Linux boxes with a quad NIC card in each. Assume the 8 ports from the two quad NIC cards all get plugged into the switch. To test each switch port I need to be able to generate traffic from all 8 ports of the two quad NIC cards. Linux optimizes my routes and sends all traffic through the default eth port, even when I specify another port. Is there any way to turn off the router in Linux or at least override it with my desired routes? I have tried many combinations of "route add", "route del", "ip route add x.x.x.x via y.y.y.y. So far I am striking out. Any help would be appreciated. </pre> </blockquote> <pre wrap=""> Do you have different networks numbers (i.e., logically and the netmask with the ip address and you should get a different answer for each interface) on each interface to make sure they are effectively on different networks so far as IP is concerned? You would also need to set up routes for each network/interface. Regards, Tony. </pre> </blockquote> One of my many experiments was to try 192.168.25.x for one port and 192.168.26.y for the other port. I made my best attempt to set up routes and masks but I don't know for sure that they were the best choice. I was suprised that even though the third octet was different, the OS still routed them out the same port. Bruce </body> </html>