From b946211680da4b6bda02a9c9a9b50f2ba4188b38 Mon Sep 17 00:00:00 2001
From: Molly Lau <windowsbeta@outlook.com>
Date: Tue, 21 Nov 2023 12:56:32 +0900
Subject: [PATCH] Update InstallNET.sh

---
 Linux_reinstall/InstallNET.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Linux_reinstall/InstallNET.sh b/Linux_reinstall/InstallNET.sh
index 1928987..3f8713f 100644
--- a/Linux_reinstall/InstallNET.sh
+++ b/Linux_reinstall/InstallNET.sh
@@ -2914,7 +2914,8 @@ function DebianModifiedPreseed() {
 		#
 		# 9. http://performance.oreda.net/linux/configuration/sysctl 高負荷·大規模システムのLinuxカーネル·チューニング Linux kernel tuning for high availability and large scale system.
 		#
-		[[ "$enableBBR" == "1" ]] && {
+		# To enable BBR is only suitable for Debian 11+
+		[[ "$enableBBR" == "1" && "$DebianDistNum" -ge "11" ]] && {
 			EnableBBR="$1 sed -i '\$anet.core.default_qdisc = fq' $3; $1 sed -i '\$anet.ipv4.tcp_congestion_control = bbr' $3; $1 sed -i '\$anet.ipv4.tcp_rmem = 8192 262144 536870912' $3; $1 sed -i '\$anet.ipv4.tcp_wmem = 4096 16384 536870912' $3; $1 sed -i '\$anet.ipv4.tcp_adv_win_scale = -2' $3; $1 sed -i '\$anet.ipv4.tcp_collapse_max_bytes = 6291456' $3; $1 sed -i '\$anet.ipv4.tcp_notsent_lowat = 131072' $3; $1 sed -i '\$anet.ipv4.ip_local_port_range = 1024 65535' $3; $1 sed -i '\$anet.core.rmem_max = 536870912' $3; $1 sed -i '\$anet.core.wmem_max = 536870912' $3; $1 sed -i '\$anet.core.somaxconn = 32768' $3; $1 sed -i '\$anet.core.netdev_max_backlog = 32768' $3; $1 sed -i '\$anet.ipv4.tcp_max_tw_buckets = 65536' $3; $1 sed -i '\$anet.ipv4.tcp_abort_on_overflow = 1' $3; $1 sed -i '\$anet.ipv4.tcp_slow_start_after_idle = 0' $3; $1 sed -i '\$anet.ipv4.tcp_timestamps = 1' $3; $1 sed -i '\$anet.ipv4.tcp_syncookies = 0' $3; $1 sed -i '\$anet.ipv4.tcp_syn_retries = 3' $3; $1 sed -i '\$anet.ipv4.tcp_synack_retries = 3' $3; $1 sed -i '\$anet.ipv4.tcp_max_syn_backlog = 32768' $3; $1 sed -i '\$anet.ipv4.tcp_fin_timeout = 15' $3; $1 sed -i '\$anet.ipv4.tcp_keepalive_intvl = 3' $3; $1 sed -i '\$anet.ipv4.tcp_keepalive_probes = 5' $3; $1 sed -i '\$anet.ipv4.tcp_keepalive_time = 600' $3; $1 sed -i '\$anet.ipv4.tcp_retries1 = 3' $3; $1 sed -i '\$anet.ipv4.tcp_retries2 = 5' $3; $1 sed -i '\$anet.ipv4.tcp_no_metrics_save = 1' $3; $1 sed -i '\$anet.ipv4.ip_forward = 1' $3; $1 sed -i '\$afs.file-max = 104857600' $3; $1 sed -i '\$afs.inotify.max_user_instances = 8192' $3; $1 sed -i '\$afs.nr_open = 1048576' $3; $1 systemctl restart systemd-sysctl;"
 		} || {
 			EnableBBR=""