I figured it out! I got both the KG250 and the KG175A to respond consistently. I ran a NAM capture on both ends and what I found is that even though it was an icmp ping only it was still asking for its netbios name because of a polling setting under settings>polling settings>perform reverse dns lookup (uncheck) I also modified the NCM icmp string to ping me with some love under settings>ncm settings>protocol settings>data portion of ICMP packet and settings>polling settings>ICMP data. try it out and let me know if it worked for you
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