V_arpt_rexmit
wtime = V_arpt_keep - V_arp_maxtries * V_arpt_rexmit;
callout_schedule(&lle->lle_timer, hz * V_arpt_rexmit);
callout_schedule(&lle->lle_timer, hz * V_arpt_rexmit);
callout_schedule(&lle->lle_timer, hz * V_arpt_rexmit);