The LOG target display these packets as having no MAC address (Indeed,
the multicast loop code strips the MAC header).
Headers are not stripped.
The "lo" device is of type loopback, so there will be no MAC header
generated at all, because none is necessary. Subsequently, there is
nothing to strip.
The multicast loopback code does not use the lo device, it uses netif_rx
on the output interface.
see ip_dev_loopback_xmit() at net/ipv4/ip_output.c:118. it does a
skb_reset_mac_header() and a __skb_pull(skb_network_offset()).
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