diff --git a/shadowsocks-libev/files/shadowsocks.conf b/shadowsocks-libev/files/shadowsocks.conf
index c901598ac..84036f5a0 100644
--- a/shadowsocks-libev/files/shadowsocks.conf
+++ b/shadowsocks-libev/files/shadowsocks.conf
@@ -25,7 +25,7 @@ net.ipv4.tcp_fin_timeout = 30
 # short keepalive time
 #net.ipv4.tcp_keepalive_time = 2400
 # outbound port range
-net.ipv4.ip_local_port_range = 10000 65000
+net.ipv4.ip_local_port_range = 9999 65000
 # max SYN backlog
 net.ipv4.tcp_max_syn_backlog = 4096
 # max timewait sockets held by system simultaneously
@@ -36,6 +36,8 @@ net.ipv4.tcp_fastopen = 3
 net.ipv4.tcp_rmem = 4096 87380 134217728
 # TCP write buffer
 net.ipv4.tcp_wmem = 4096 65536 134217728
+# TCP buffer
+net.ipv4.tcp_mem = 25600 51200 102400
 # turn on path MTU discovery
 net.ipv4.tcp_mtu_probing = 1