diff --git a/openmptcprouter/files/etc/sysctl.d/default.conf b/openmptcprouter/files/etc/sysctl.d/default.conf
index a672d7ae8..187561d0e 100644
--- a/openmptcprouter/files/etc/sysctl.d/default.conf
+++ b/openmptcprouter/files/etc/sysctl.d/default.conf
@@ -1,6 +1,4 @@
-net.ipv4.tcp_ecn=1
 net.netfilter.nf_conntrack_helper=1
-net.ipv4.tcp_slow_start_after_idle=30
-net.ipv4.tcp_no_metrics_save=1
 net.ipv4.tcp_fack=1
-net.ipv4.tcp_retries2=3
+net.core.somaxconn=4096
+net.core.netdev_max_backlog=4096
diff --git a/shadowsocks-libev/files/shadowsocks.conf b/shadowsocks-libev/files/shadowsocks.conf
index 84036f5a0..3fcba588b 100644
--- a/shadowsocks-libev/files/shadowsocks.conf
+++ b/shadowsocks-libev/files/shadowsocks.conf
@@ -12,7 +12,7 @@ net.core.wmem_default = 65536
 # max processor input queue
 net.core.netdev_max_backlog = 4096
 # max backlog
-net.core.somaxconn = 4096
+#net.core.somaxconn = 4096
 
 # resist SYN flood attacks
 net.ipv4.tcp_syncookies = 1
@@ -27,7 +27,7 @@ net.ipv4.tcp_fin_timeout = 30
 # outbound port range
 net.ipv4.ip_local_port_range = 9999 65000
 # max SYN backlog
-net.ipv4.tcp_max_syn_backlog = 4096
+et.ipv4.tcp_max_syn_backlog = 10240
 # max timewait sockets held by system simultaneously
 net.ipv4.tcp_max_tw_buckets = 10000
 # turn on TCP Fast Open on both client and server side
@@ -35,11 +35,11 @@ net.ipv4.tcp_fastopen = 3
 # TCP receive buffer
 net.ipv4.tcp_rmem = 4096 87380 134217728
 # TCP write buffer
-net.ipv4.tcp_wmem = 4096 65536 134217728
+net.ipv4.tcp_wmem = 4096 87380 134217728
 # TCP buffer
-net.ipv4.tcp_mem = 25600 51200 102400
-# turn on path MTU discovery
-net.ipv4.tcp_mtu_probing = 1
+#net.ipv4.tcp_mem = 25600 87380 102400
+# turn off path MTU discovery
+net.ipv4.tcp_mtu_probing = 0
 
 # for low-latency network, use cubic instead
 # net.ipv4.tcp_congestion_control = balia