I had a question about the Ethernet packet format from
etherpkt.cc/etherpkt.hh When I use EtherTap and decode the packets
using tcpdump at the tap-interface, all ping packets from a simulated
GEM5 system show up as :

08:26:28.672914 ff:ff:ff:ff:00:90 (oui Unknown) > 00:00:00:2a:ff:ff
(oui Ethernet) Null Information, send seq 4, rcv seq 3, Flags
[Response], length 32

This leads me to think that the packet format is non-standard, because
this can usually be decoded as an ICMP packet by tcpdump. Besides the
ping packet has a non-standard length of 84 in the simulated GEM5
system. Can anyone help me out here ?

Anirudh
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