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df79773bc0
Two Alpine containers on a kernel link, a static raw-Ethernet probe built at run time and docker-cp'd in (the image has no raw-frame tool; DockerDaemon gains the cp), injecting per-destination-MAC frames from guest 1 while guest 2 counts arrivals: ordinary multicast, STP, LACP, 802.1X and LLDP must cross, PAUSE must not (the documented kernel limit). Asserts the anchors' sysfs brport group_fwd_mask reads 0xfffd through the server's own wiring (int-parsed: newer kernels print it hex), that the bridge level stays 0, and that a container stop/start replays the mask with LACP surviving. Negative control is the uBridge suite's setportgroupfwd 0 case.