You can ping 127.0.0.1 even when there is no NIC, or when not connected to a switch/router. Being able to ping the IP address is also not a reliable indicator because 'lo0', 127.0.0.1 is the interface being used.
I would try a longer network cable.
You also could run tcpdump which puts the NIC into promiscuous mode, and see whether that makes a difference.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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