Xing's Techlog

科学上网配置指南

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科学上网配置和优化详细步骤。

首先你需要有一个可以上外网的vpn，推荐安装CentOS 7系统，下面是基本配置过程。

1）安装ss

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yum install python-setuptools
easy_install pip
pip install shadowsocks

使用下面这条命令判断一下端口是否能用

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ssserver -p 443 -k password -m rc4-md5

2）新建配置文件

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vi ssconfig

输入以下内容

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{
    "server":"::",
    "server_port":刚才测试成功的端口号,
    "local_address": "127.0.0.1",
    "local_port":1080,
    "password":"你的密码",
    "timeout":300,
    "method":"aes-256-cfb",
    "fast_open": false
}

3）设置开机启动

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cd /etc/rc.d/
chmod +x rc.local
vi rc.local

添加下面一条语句

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ssserver -c 配置文件觉得路径 -d start

优化过程：

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vi /etc/sysctl.d/local.conf

添加下面内容：

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# max open files
fs.file-max = 51200
# max read buffer
net.core.rmem_max = 67108864
# max write buffer
net.core.wmem_max = 67108864
# default read buffer
net.core.rmem_default = 65536
# default write buffer
net.core.wmem_default = 65536
# max processor input queue
net.core.netdev_max_backlog = 4096
# max backlog
net.core.somaxconn = 4096

# resist SYN flood attacks
net.ipv4.tcp_syncookies = 1
# reuse timewait sockets when safe
net.ipv4.tcp_tw_reuse = 1
# turn off fast timewait sockets recycling
net.ipv4.tcp_tw_recycle = 0
# short FIN timeout
net.ipv4.tcp_fin_timeout = 30
# short keepalive time
net.ipv4.tcp_keepalive_time = 1200
# outbound port range
net.ipv4.ip_local_port_range = 10000 65000
# max SYN backlog
net.ipv4.tcp_max_syn_backlog = 4096
# max timewait sockets held by system simultaneously
net.ipv4.tcp_max_tw_buckets = 5000
# turn on TCP Fast Open on both client and server side
net.ipv4.tcp_fastopen = 3
# TCP receive buffer
net.ipv4.tcp_rmem = 4096 87380 67108864
# TCP write buffer
net.ipv4.tcp_wmem = 4096 65536 67108864
# turn on path MTU discovery
net.ipv4.tcp_mtu_probing = 1

# for high-latency network
net.ipv4.tcp_congestion_control = hybla

# for low-latency network, use cubic instead
# net.ipv4.tcp_congestion_control = cubic
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sysctl --system

然后重启系统就可以了。

参考：shadowsocks wiki