We recently tripped over the “vpe-icmp4-oam” scheme. It’s a historical artifact 
which consumes for-us icmp4 echo_reply packets. Net of switching init function 
ordering to a constraint-based topological sort, it reappeared.

The ping CLI input node has been consuming for-us ip4 icmp packets for quite 
some time, so I seriously doubt that anyone has been using the old icmp4 oam 
scheme.

Unless someone speaks up rapidly, I’d like to remove the oam scheme. I’m also 
going to add a warning about duplicate ip4 icmp type registrations, to prevent 
a recurrence... 😉...

Thanks... Dave

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