Just to follow up on this. This is all working properly now, the culprit was a cached ARP table on a Comcast SMC modem. The only way to clear the cache is to power cycle the comcast modem, apparently.
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Just to follow up on this. This is all working properly now, the culprit was a cached ARP table on a Comcast SMC modem. The only way to clear the cache is to power cycle the comcast modem, apparently.