SS-REDIR(1)

💅 SS-REDIR(1) — okay bestie, this is the shadowsocks-libev manual page, and yes we're reading it together 🫶

So this is ss-redir from the Shadowsocks-libev manual — it's the shadowsocks client as transparent proxy, libev port. Sit down, grab a drink, we're gonna get through it 💖

✨ NAME ✨

ss-redir — shadowsocks client as transparent proxy, libev port. That's the whole vibe. She redirects, she proxies, she's transparent about it 💅

🌸 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>]

No cap, that's the whole shape of her 🎀

🦋 DESCRIPTION 🦋

Okay so — Shadowsocks-libev is a lightweight and secure socks5 proxy, and it's a port of the original shadowsocks created by clowwindy. It's written in pure C and it takes advantage of libev so it gets both high performance and low resource consumption. Like, obsessed. Main character energy fr 🔥

Shadowsocks-libev consists of five components. ss-redir is the one that works as a transparent proxy on local machines to proxy TCP traffic — and here's the catch bestie, she requires netfilter's NAT module 😭. For more info, go check out shadowsocks-libev(8) and the EXAMPLE section below, iykyk.

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💖 OPTIONS 💖

• -s <server_host> — sets the server's hostname or IP. Where we're going ✈️
• -p <server_port> — sets the server's port number.
• -l <local_port> — sets the local port number.
• -k <password>, --password <password> — sets the password. The server and the client should use the same password — like matching friendship bracelets but for crypto 🫶
• --key <key_in_base64> — sets the key directly. The key should be encoded with URL-safe Base64.
• -m <encrypt_method> — sets the cipher.

Shadowsocks-libev accepts 19 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, xchacha20-ietf-poly1305, salsa20, chacha20
and chacha20-ietf.

The default cipher is chacha20-ietf-poly1305 — she's the moment ⭐

Heads up bestie: if it's built with PolarSSL or custom OpenSSL libraries, some of these ciphers may not work. Not me finding that out the hard way 💀

• -a <user_name> — run as a specific user.
• -f <pid_file> — start shadowsocks as a daemon with a specific pid file.
• -t <timeout> — sets 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 the local address to use while this client is making outbound connections to the server.
• -u — enable UDP relay. TPROXY is required in redir mode, and you may need root permission 👑
• -U — enable UDP relay and disable TCP relay.
• -T — use tproxy instead of redirect. (for tcp)
• -6 — resolve 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.
• --tcp-incoming-sndbuf <size> — set TCP send buffer size for incoming connections.
• --tcp-incoming-rcvbuf <size> — set TCP receive buffer size for incoming connections.
• --tcp-outgoing-sndbuf <size> — set TCP send buffer size for outgoing connections.
• --tcp-outgoing-rcvbuf <size> — set TCP receive buffer size for outgoing connections.
• --plugin <plugin_name> — enable SIP003 plugin. (Experimental) 🙈
• --plugin-opts <plugin_options> — set SIP003 plugin options. (Experimental)
• -v — enable verbose mode. She talks now 🗣️
• -h|--help — print help message.

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🔥 EXAMPLE 🔥

ss-redir requires netfilter's NAT function — no NAT, no party. Here's an example:

# Create new chain
iptables -t nat -N SHADOWSOCKS
iptables -t mangle -N SHADOWSOCKS

# Ignore your shadowsocks server's addresses
# It's very IMPORTANT, just be careful.
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.
iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN

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

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

# Apply the rules
iptables -t nat -A PREROUTING -p tcp -j SHADOWSOCKS
iptables -t mangle -A PREROUTING -j SHADOWSOCKS

# Start the shadowsocks-redir
ss-redir -u -c /etc/config/shadowsocks.json -f /var/run/shadowsocks.pid

Bestie, that # It's very IMPORTANT, just be careful. comment is in the original and I'm keeping it because it's giving warnings from a wise elder 🌈 Don't skip the RETURN rules, fr fr.

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🎀 SEE ALSO 🎀

ss-local(1), ss-server(1), ss-tunnel(1), ss-manager(1), shadowsocks-libev(8), iptables(8), /etc/shadowsocks-libev/config.json — go read the whole friend group 💜

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And that's the page! Here's the cute sign-off: this served you Shadowsocks-libev 3.3.6, dated 10/11/2026, and it's the SS-REDIR(1) page — slay, you read the whole thing, I'm so proud of you 🧚✨🍓