RIP_PORT
} else if (from->sin_port == htons(RIP_PORT)) {
if (from->sin_port == htons(RIP_PORT)) {
if (from->sin_port != htons(RIP_PORT)) {
if (from->sin_port != htons(RIP_PORT)) {
if (from->sin_port != ntohs(RIP_PORT)) {
rsin.sin_port = htons(RIP_PORT);
osin.sin_port = htons(RIP_PORT);
router.sin_port = htons(RIP_PORT);