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Think this one is resolved. As mentioned above, the subnets are /26, which gives about 60 usable addresses. The default setting for net.ipv4.neigh.default.gc_thresh1 in CentOS was 128. With a /26, it's not possible to hit that threshold so gc never runs. This resulted in old entries staying in arp cache for months and causing problems when ip addresses were re-used. I lowered the value of gc_thresh1 and the old/STALE entries almost immediately dropped out of the arp cache. Need to implement this across our hosts and let it run for a while, but initial results look promising.
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