sysctl -w net.ipv4.conf.eth0.route_localnet=1

By default this value is 0, which instructs the kernel to not route external traffic destined to 127.0.0.0/8. This is just for security as such traffic is not normal.

iptables -t nat -I PREROUTING -p udp -d 192.168.170.0/24 --dport 53 -j DNAT --to-destination 127.0.1.1:53

vi /etc/sysctl.conf

change -> net.ipv4.ip_forward = 1

sysctl -p

# 给eth0接口添加网段

ip addr add 192.168.170.1/24 dev eth0

iptables -t nat -A POSTROUTING -s 192.168.170.0/24 -o eth0 -j MASQUERADE

iptables -t nat -I PREROUTING -p tcp -i eth0 -j REDSOCKS

# 注意 redsocks 配置绑定的 127.0.0.1 改成 0.0.0.0

/etc/NetworkManager/dispatcher.d/02addroute: 

#!/bin/bash

# Script to dispatch NetworkManager events

# Runs ifupdown scripts when NetworkManager fiddles with interfaces.

# See NetworkManager(8) for further documentation of the dispatcher events.

if [ -z "$1" ]; then

echo "$0: called with no interface" 1>&2

exit 1;

fi

if [[ "$1" == "eth0"  ]] && [[ "$2" == "up" ]]; then

ip addr add 192.168.170.1/24 dev eth0

fi