利用iptables的nat功能使内网主机上网_iptables -t nat -f导致网络不通

拓扑：

client：
eth0:1 192.168.10.2/24 gateway 192.168.10.1

PC1：
wlp5s0: 192.168.1.170/24 gateway: 192.168.1.1/24
enp9s0:1 192.168.10.1/24

192.168.10.2 -> baidu.com SNAT工具？ 192.168.1.170 -> baidu.com

SNAT：选用iptables软件作为SNAT转换工具。

1、client设置
1）IP设置

sudo ip address add 192.168.10.2/24 dev eth0:1

2）路由设置

sudo ip route add default via 192.168.10.1

3）dns设置

l@l-HP-540:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.1.1
1
2
3

2、PC1设置
1）IP及路由设置

ip route add default via 192.168.1.1 dev wlp5s0
ip address add 192.168.10.1/24 dev enp9s0:1
1

2）iptables设置

iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -j SNAT --to-source 192.168.1.170

iptables规则查询：

iptables -t nat --list

iptables规则清除：

iptables -t nat -F

3）防火墙设置

systemctl stop firewalld

(注：每次执行systemctl start firewalld命令，都会清除iptables规则，因此关闭比较好)

3、测试
1）client ping baidu.com

l@l-HP-540:~$ ping baidu.com
PING baidu.com (39.156.69.79) 56(84) bytes of data.
64 bytes from 39.156.69.79: icmp_seq=1 ttl=52 time=26.1 ms
64 bytes from 39.156.69.79: icmp_seq=2 ttl=52 time=26.7 ms
64 bytes from 39.156.69.79: icmp_seq=3 ttl=52 time=26.7 ms
64 bytes from 39.156.69.79: icmp_seq=4 ttl=52 time=26.8 ms
64 bytes from 39.156.69.79: icmp_seq=5 ttl=52 time=27.1 ms
64 bytes from 39.156.69.79: icmp_seq=6 ttl=52 time=26.8 ms
1
2
3
4
5
6
7