ARP_MAXAGE is only used within LwIP.
 
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ARP_MAXAGE macro

the time an ARP entry stays valid after its last update, for ARP_TMR_INTERVAL = 1000, this is (60 * 5) seconds = 5 minutes.

Syntax

#define ARP_MAXAGE 300

References

LocationText
opt.h:644
#define ARP_MAXAGE 300
etharp.c:66
#define ARP_AGE_REREQUEST_USED_UNICAST (ARP_MAXAGE - 30)
etharp.c:67
#define ARP_AGE_REREQUEST_USED_BROADCAST (ARP_MAXAGE - 15)
etharp.c:211
if ((arp_table[i].ctime >= ARP_MAXAGE) ||