RIPSIZE
if (sendto(s, ripbuf, RIPSIZE(1), 0, (struct sockaddr *)&sin6,
} while (len == RIPSIZE(24));
error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
(void)sendpacket(sin6, RIPSIZE(nn));
error = sendpacket(sin6, RIPSIZE(nrt));