my $cmtu = $ifaces->{$child}->{mtu} ? $ifaces->{$child}->{mtu} : 1500;
die "interface '$parent' - mtu $pmtu is bigger than '$child' - mtu $cmtu\n"
my $cmtu = $ifaces->{$child}->{mtu} ? $ifaces->{$child}->{mtu} : 1500;
die "interface '$parent' - mtu $pmtu is bigger than '$child' - mtu $cmtu\n"