MIN_MTU
if (mtu < MIN_MTU) {
warning("mtu size %u < %d: ignored", (unsigned)mtu, MIN_MTU);
if ((set->mtu < MIN_MTU) || (set->mtu > MAX_MTU))
if (long_val && long_val < MIN_MTU) {
log_Printf(LogWARN, "MTU %ld: too small - min %d\n", long_val, MIN_MTU);