>>959 man 4 arp にはこんなことが書いてあるから、 --- MIB Variables The ARP protocol implements a number of configrable variables in net.link.ether.inet branch of the sysctl(3) MIB.
prune_intvl How frequently the ARP cache is cleaned from expired entries.
max_age How long an ARP entry is held in the cache until it needs to be refreshed.
maxtries Number of retransmits before host is considered down and error is returned.
useloopback If an ARP entry is added for local address, force the traf- fic to go through the loopback interface.
proxyall Enables ARP proxying for all hosts on net. --- お好みの変数をいじってみたら?