diff --git a/ip_manager/throttle.go b/ip_manager/throttle.go
index 6289dee..7d12bc9 100644
--- a/ip_manager/throttle.go
+++ b/ip_manager/throttle.go
@@ -2,7 +2,6 @@ package ip_manager
 
 import (
 	"net"
-	"os"
 	"sort"
 	"sync"
 	"time"
@@ -46,8 +45,7 @@ func GetIPPool(stopGrp *stop.Group) (*IPPool, error) {
 	var pool []throttledIP
 	for _, address := range addrs {
 		if ipnet, ok := address.(*net.IPNet); ok && ipnet.IP.IsGlobalUnicast() {
-			ipv6Disabled := os.Getenv("DISABLE_IPV6") != ""
-			if ipnet.IP.To16() != nil && govalidator.IsIPv6(ipnet.IP.String()) && !ipv6Disabled {
+			if ipnet.IP.To16() != nil && govalidator.IsIPv6(ipnet.IP.String()) {
 				pool = append(pool, throttledIP{
 					IP:      ipnet.IP.String(),
 					LastUse: time.Now().Add(-5 * time.Minute),
diff --git a/sources/youtubeVideo.go b/sources/youtubeVideo.go
index 7ed5a37..f80b117 100644
--- a/sources/youtubeVideo.go
+++ b/sources/youtubeVideo.go
@@ -279,15 +279,7 @@ func (v *YoutubeVideo) download() error {
 		"--load-info-json",
 		metadataPath,
 	}
-	ipv6Disabled := os.Getenv("DISABLE_IPV6") != ""
-	if ipv6Disabled {
-		ytdlArgs = append(ytdlArgs,
-			"--external-downloader",
-			"aria2c",
-			"--external-downloader-args",
-			"aria2c:-j 16 -x 16 -s 16 -k 1M",
-		)
-	}
+
 	userAgent := []string{"--user-agent", downloader.ChromeUA}
 	if v.maxVideoSize > 0 {
 		ytdlArgs = append(ytdlArgs,