[Edited Message Follows] moving the buffer backwards by 14 looks correct for small packets, but for 1500 byte packets I get `truncated-ip - 14 bytes missing` error from tcpdump. After the clone I'm restoring the original offset: vlib_buffer_advance (b0, -14); u16 n_cloned = vlib_buffer_clone (vm, bi0, (u32*)&cbi0, 2, VLIB_BUFFER_CLONE_HEAD_SIZE); vlib_buffer_advance (b0, 14);
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