NAME

       ss-redir - shadowsocks client as transparent proxy, libev port

SYNOPSIS

       ss-redir [-uUv6] [-h|--help] [-s <server_host>] [-p <server_port>] [-l <local_port>] [-k
       <password>] [-m <encrypt_method>] [-f <pid_file>] [-t <timeout>] [-c <config_file>] [-b
       <local_address>] [-a <user_name>] [-n <nofile>] [--mtu <MTU>] [--no-delay] [--plugin
       <plugin_name>] [--plugin-opts <plugin_options>] [--password <password>] [--key
       <key_in_base64>]

DESCRIPTION

       Shadowsocks-libev is a lightweight and secure socks5 proxy. It is a port of the original
       shadowsocks created by clowwindy. Shadowsocks-libev is written in pure C and takes
       advantage of libev to achieve both high performance and low resource consumption.

       Shadowsocks-libev consists of five components. ss-redir(1) works as a transparent proxy on
       local machines to proxy TCP traffic and requires netfilter’s NAT module. For more
       information, check out shadowsocks-libev(8) and the following EXAMPLE section.

OPTIONS

       -s <server_host>
           Set the server’s hostname or IP.

       -p <server_port>
           Set the server’s port number.

       -l <local_port>
           Set the local port number.

       -k <password>, --password <password>
           Set the password. The server and the client should use the same password.

       --key <key_in_base64>
           Set the key directly. The key should be encoded with URL-safe Base64.

       -m <encrypt_method>
           Set the cipher.

           Shadowsocks-libev accepts 18 different ciphers:

           aes-128-gcm, aes-192-gcm, aes-256-gcm, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
           aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb, camellia-128-cfb, camellia-192-cfb,
           camellia-256-cfb, chacha20-ietf-poly1305, salsa20, chacha20 and chacha20-ietf.

           The default cipher is rc4-md5.

           If built with PolarSSL or custom OpenSSL libraries, some of these ciphers may not
           work.

       -a <user_name>
           Run as a specific user.

       -f <pid_file>
           Start shadowsocks as a daemon with specific pid file.

       -t <timeout>
           Set the socket timeout in seconds. The default value is 60.

       -c <config_file>
           Use a configuration file.

           Refer to shadowsocks-libev(8) CONFIG FILE section for more details.

       -n <number>
           Specify max number of open files.

           Only available on Linux.

       -b <local_address>
           Specify local address to bind.

       -u
           Enable UDP relay.

           TPROXY is required in redir mode. You may need root permission.

       -U
           Enable UDP relay and disable TCP relay.

       -6
           Resovle hostname to IPv6 address first.

       --mtu <MTU>
           Specify the MTU of your network interface.

       --mptcp
           Enable Multipath TCP.

           Only available with MPTCP enabled Linux kernel.

       --reuse-port
           Enable port reuse.

           Only available with Linux kernel > 3.9.0.

       --no-delay
           Enable TCP_NODELAY.

       --plugin <plugin_name>
           Enable SIP003 plugin. (Experimental)

       --plugin-opts <plugin_options>
           Set SIP003 plugin options. (Experimental)

       -v
           Enable verbose mode.

       -h|--help
           Print help message.

EXAMPLE

       ss-redir requires netfilter’s NAT function. Here is an example:

           # Create new chain
           root@Wrt:~# iptables -t nat -N SHADOWSOCKS
           root@Wrt:~# iptables -t mangle -N SHADOWSOCKS

           # Ignore your shadowsocks server's addresses
           # It's very IMPORTANT, just be careful.
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 123.123.123.123 -j RETURN

           # Ignore LANs and any other addresses you'd like to bypass the proxy
           # See Wikipedia and RFC5735 for full list of reserved networks.
           # See ashi009/bestroutetb for a highly optimized CHN route list.
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN

           # Anything else should be redirected to shadowsocks's local port
           root@Wrt:~# iptables -t nat -A SHADOWSOCKS -p tcp -j REDIRECT --to-ports 12345

           # Add any UDP rules
           root@Wrt:~# ip route add local default dev lo table 100
           root@Wrt:~# ip rule add fwmark 1 lookup 100
           root@Wrt:~# iptables -t mangle -A SHADOWSOCKS -p udp --dport 53 -j TPROXY --on-port 12345 --tproxy-mark 0x01/0x01

           # Apply the rules
           root@Wrt:~# iptables -t nat -A PREROUTING -p tcp -j SHADOWSOCKS
           root@Wrt:~# iptables -t mangle -A PREROUTING -j SHADOWSOCKS

           # Start the shadowsocks-redir
           root@Wrt:~# ss-redir -u -c /etc/config/shadowsocks.json -f /var/run/shadowsocks.pid

SEE ALSO

       ss-local(1), ss-server(1), ss-tunnel(1), ss-manager(1), shadowsocks-libev(8), iptables(8),
       /etc/shadowsocks-libev/config.json