While attempting to send ARP DAD packets on a bridge device, I noticed that hosts attached to the bridge ports were not responding. After digging in with tcpdump/wireshark, I noticed that the MAC addresses of the packets (the first 12 bytes of the Ethernet frame) were wrong and were an exact duplicate of the following 12 bytes (bytes 13-24), but only on slave bridge ports. The bridge device itself had the correct addresses. Here is an example setup:

# ip link add br0 type bridge vlan_filtering 1


-- Brandon Carpenter | Software Engineer Cypherpath, Inc. 400 Columbia Point Drive Ste 101 | Richland, Washington USA Office: (650) 713-3060



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