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Some external drivers (observed with the UEFI NII driver provided by an HPE-branded Mellanox ConnectX-3 Pro) seem to cause LACP packets transmitted by iPXE to be looped back as received packets. Since iPXE's trivial LACP responder will send one response per received packet, this results in an immediate LACP packet storm. Detect looped back LACP packets (based on the received LACP actor MAC address), and refuse to respond to such packets. Reported-by: Tore Anderson <tore@fud.no> Tested-by: Tore Anderson <tore@fud.no> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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