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Why won't my Arduino return its pings?
// Set the IP address we'll be using.  Make sure this doesn't conflict with
// any IP addresses or subnets on your LAN or you won't be able to connect to
// either the Arduino or your LAN...
IP_ADDR myIP = {192,168,5,2};
IP_ADDR subnet = {255,255,255,0};

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
...             ...             ...             ...   ...    ...    ...
192.168.5.2     *               255.255.255.255 UH    0      0        0 sl0