well, using iPerf, I realized that my issue was not related to the vlan implementation on linux. rather, it is my multicast application's inability to bind to vlan interfaces. thanks for the help, off to the application forum.... -- ========================================================= | Anthony Ben'jammin' DeNardo III | | Network Multimedia Architect | | Academic Computing & Networking Services | | Colorado State University | | 970-297-3710 | | ad3@xxxxxxxxxxxxx | =========================================================