Hello, There is a config: pc--RB600A/R52N----RB600A/r52N--pc ROS is 4.0rc1 on both boards. The link is "perfect" stable (tx/rx rate 270/270Mbps, CCQ 95-100%). BTest results: one direction 208Mbps UDP, both 153/148Mbps UDP, 144MBps TCP and both 87/72Mbps TCP. Its seems good but i tested ipe...