sifproxyarp
if (wo->proxy_arp && sifproxyarp(u, wo->hisaddr, proxy_arp_quiet[u]))
sifproxyarp(f->unit, ho->hisaddr, proxy_arp_quiet[f->unit]))
sifproxyarp(f->unit, ho->hisaddr, proxy_arp_quiet[f->unit]))
extern int sifproxyarp __P((int unit, u_int32_t addr, int flag));