It speaks!

HydraRaptor just replied to ping, so that's PHY, MAC, ARP, IP and ICMP working.

Pinging 10.0.0.42 with 32 bytes of data:

Reply from 10.0.0.42: bytes=32 time=1ms TTL=128
Reply from 10.0.0.42: bytes=32 time<1ms TTL=128
Reply from 10.0.0.42: bytes=32 time<1ms TTL=128
Reply from 10.0.0.42: bytes=32 time<1ms TTL=128

Ping statistics for 10.0.0.42:
  Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
  Minimum = 0ms, Maximum = 1ms, Average = 0ms

UDP next.