diff --git a/Optimizing-Shadowsocks.md b/Optimizing-Shadowsocks.md
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+On Debian 7:
+
+Create /etc/sysctl.d/local.conf with the following content:
+
+```
+fs.file-max = 51200
+
+net.core.rmem_max = 67108864 
+net.core.wmem_max = 67108864 
+net.core.netdev_max_backlog = 250000
+net.core.somaxconn = 3240000
+
+net.ipv4.tcp_syncookies = 1
+net.ipv4.tcp_tw_reuse = 1
+net.ipv4.tcp_fin_timeout = 30
+net.ipv4.tcp_keepalive_time = 1200
+net.ipv4.ip_local_port_range = 10000 65000
+net.ipv4.tcp_max_syn_backlog = 8192
+net.ipv4.tcp_max_tw_buckets = 5000
+net.ipv4.tcp_fastopen = 3
+net.ipv4.tcp_rmem = 4096 87380 67108864
+net.ipv4.tcp_wmem = 4096 65536 67108864
+net.ipv4.tcp_mtu_probing = 1
+net.ipv4.tcp_congestion_control = hybla
+```
+
+Then:
+
+    sysctl -p
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