Logging non tcp/udp/icmp packets

["Thomas Porter, Ph.D." <tporter () dtool com>]

I'd like to log all non tcp/udp/icmp packets inbound or outbound. What's
the right syntax for the rule below? Thanks

# Logging uncommon protocols
log [!tcp || !udp || !icmp] $EXTERNAL_NET any <> $HOME_NET any (msg:
"Unknown Protocol";session: printable;)


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