使用REDSOCKS以便科学上网

V2RAY内置一个dokodemo-door以便用户进行重定向，达到科学上网的目的。

然而，这种上网方式并不稳定，时常出现CPU爆满、内存溢出等的问题。

所以，这里不再使用dokodemo-door。

开始安装redsocks：

apt install redsocks
#在开始之前请确保12345端口未被占用Code language: PHP (php)

配置文件（/etc/redsocks.conf）：

base {
	// debug: connection progress & client list on SIGUSR1
	log_debug = off;

	// info: start and end of client session
	log_info = on;

	/* possible `log' values are:
	 *   stderr
	 *   "file:/path/to/file"
	 *   syslog:FACILITY  facility is any of "daemon", "local0"..."local7"
	 */
	log = "syslog:daemon";

	// detach from console
	daemon = on;

	/* Change uid, gid and root directory, these options require root
	 * privilegies on startup.
	 * Note, your chroot may requre /etc/localtime if you write log to syslog.
	 * Log is opened before chroot & uid changing.
	 */
	user = redsocks;
	group = redsocks;
	// chroot = "/var/chroot";

	/* possible `redirector' values are:
	 *   iptables   - for Linux
	 *   ipf        - for FreeBSD
	 *   pf         - for OpenBSD
	 *   generic    - some generic redirector that MAY work
	 */
	redirector = iptables;
	redsocks_conn_max = 10000;
	rlimit_nofile = 10240;
}

redsocks {
	/* `local_ip' defaults to 127.0.0.1 for security reasons,
	 * use 0.0.0.0 if you want to listen on every interface.
	 * `local_*' are used as port to redirect to.
	 */
	local_ip = 0.0.0.0;
	local_port = 12345;

	// `ip' and `port' are IP and tcp-port of proxy-server
	// You can also use hostname instead of IP, only one (random)
	// address of multihomed host will be used.
	ip = 192.168.21.1;
	port = 1080;


	// known types: socks4, socks5, http-connect, http-relay
	type = socks5;

	// login = "foobar";
	// password = "baz";
}Code language: PHP (php)

有时候连接会达到限制，而被强制关闭，以下是官方的说明文档：

base {
	// debug: connection progress
	log_debug = off;

	// info: start and end of client session
	log_info = on;

	/* possible `log' values are:
	 *   stderr
	 *   "file:/path/to/file"
	 *   syslog:FACILITY  facility is any of "daemon", "local0"..."local7"
	 */
	log = stderr;
	// log = "file:/path/to/file";
	// log = "syslog:local7";

	// detach from console
	daemon = off;

	/* Change uid, gid and root directory, these options require root
	 * privilegies on startup.
	 * Note, your chroot may requre /etc/localtime if you write log to syslog.
	 * Log is opened before chroot & uid changing.
	 * Debian, Ubuntu and some other distributions use `nogroup` instead of
	 * `nobody`, so change it according to your system if you want redsocks
	 * to drop root privileges.
	 */
	// user = nobody;
	// group = nobody;
	// chroot = "/var/chroot";

	/* possible `redirector' values are:
	 *   iptables   - for Linux
	 *   ipf        - for FreeBSD
	 *   pf         - for OpenBSD
	 *   generic    - some generic redirector that MAY work
	 */
	redirector = iptables;

	/* Override per-socket values for TCP_KEEPIDLE, TCP_KEEPCNT,
	 * and TCP_KEEPINTVL. see man 7 tcp for details.
	 * `redsocks' relies on SO_KEEPALIVE option heavily. */
	//tcp_keepalive_time = 0;
	//tcp_keepalive_probes = 0;
	//tcp_keepalive_intvl = 0;

	// Every `redsocks` connection needs two file descriptors for sockets.
	// If `splice` is enabled, it also needs four file descriptors for
	// pipes.  `redudp` is not accounted at the moment.  When max number of
	// connection is reached, redsocks tries to close idle connections. If
	// there are no idle connections, it stops accept()'ing new
	// connections, although kernel continues to fill listenq.

	// Set maximum number of open file descriptors (also known as `ulimit -n`).
	//  0 -- do not modify startup limit (default)
	// rlimit_nofile = 0;

	// Set maximum number of served connections. Default is to deduce safe
	// limit from `splice` setting and RLIMIT_NOFILE.
	// redsocks_conn_max = 0;

	// Close connections idle for N seconds when/if connection count
	// limit is hit.
	//  0 -- do not close idle connections
	//  7440 -- 2 hours 4 minutes, see RFC 5382 (default)
	// connpres_idle_timeout = 7440;

	// `max_accept_backoff` is a delay in milliseconds to retry `accept()`
	// after failure (e.g. due to lack of file descriptors). It's just a
	// safety net for misconfigured `redsocks_conn_max`, you should tune
	// redsocks_conn_max if accept backoff happens.
	// max_accept_backoff = 60000;
}

redsocks {
	/* `local_ip' defaults to 127.0.0.1 for security reasons,
	 * use 0.0.0.0 if you want to listen on every interface.
	 * `local_*' are used as port to redirect to.
	 */
	local_ip = 127.0.0.1;
	local_port = 12345;

	// listen() queue length. Default value is SOMAXCONN and it should be
	// good enough for most of us.
	// listenq = 128; // SOMAXCONN equals 128 on my Linux box.

	// Enable or disable faster data pump based on splice(2) syscall.
	// Default value depends on your kernel version, true for 2.6.27.13+
	// splice = false;

	// `ip' and `port' are IP and tcp-port of proxy-server
	// You can also use hostname instead of IP, only one (random)
	// address of multihomed host will be used.
	ip = example.org;
	port = 1080;

	// known types: socks4, socks5, http-connect, http-relay
	type = socks5;

	// login = "foobar";
	// password = "baz";

	// known ways to disclose client IP to the proxy:
	//  false -- disclose nothing
	// http-connect supports:
	//  X-Forwarded-For  -- X-Forwarded-For: IP
	//  Forwarded_ip     -- Forwarded: for=IP # see RFC7239
	//  Forwarded_ipport -- Forwarded: for="IP:port" # see RFC7239
	// disclose_src = false;

	// various ways to handle proxy failure
	//  close -- just close connection (default)
	//  forward_http_err -- forward HTTP error page from proxy as-is
	// on_proxy_fail = close;
}

redudp {
	// `local_ip' should not be 0.0.0.0 as it's also used for outgoing
	// packets that are sent as replies - and it should be fixed
	// if we want NAT to work properly.
	local_ip = 127.0.0.1;
	local_port = 10053;

	// `ip' and `port' of socks5 proxy server.
	ip = 10.0.0.1;
	port = 1080;
	login = username;
	password = pazzw0rd;

	// redsocks knows about two options while redirecting UDP packets at
	// linux: TPROXY and REDIRECT.  TPROXY requires more complex routing
	// configuration and fresh kernel (>= 2.6.37 according to squid
	// developers[1]) but has hack-free way to get original destination
	// address, REDIRECT is easier to configure, but requires `dest_ip` and
	// `dest_port` to be set, limiting packet redirection to single
	// destination.
	// [1] http://wiki.squid-cache.org/Features/Tproxy4
	dest_ip = 8.8.8.8;
	dest_port = 53;

	udp_timeout = 30;
	udp_timeout_stream = 180;
}

dnstc {
	// fake and really dumb DNS server that returns "truncated answer" to
	// every query via UDP, RFC-compliant resolver should repeat same query
	// via TCP in this case.
	local_ip = 127.0.0.1;
	local_port = 5300;
}

// you can add more `redsocks' and `redudp' sections if you need.
Code language: PHP (php)