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帮助理解 iptables 路由器脚本和错误

tag-icon • tag-icon networking server iptables routing
帮助理解 iptables 路由器脚本和错误

您好，我正在使用这个路由脚本，当所有网络接口启动时它会运行：

#!/bin/sh

PATH=/usr/sbin:/sbin:/bin:/usr/bin

#
# delete all existing rules.
#
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X

# Always accept loopback traffic
iptables -A INPUT -i lo -j ACCEPT


# Allow established connections, and those not coming from the outside
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW -i ! wlan0 -j ACCEPT
iptables -A FORWARD -i wlan0 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow outgoing connections from the LAN side.
iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT

# Masquerade.
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

# Don't forward from the outside to the inside.
iptables -A FORWARD -i wlan0 -o wlan0 -j REJECT

# Enable routing.
echo 1 > /proc/sys/net/ipv4/ip_forward

wlan0 是我的 wifi 连接到我的安卓手机 wifi 网络共享，ip 范围是 192.168.43.0/24 eth0 是我的 LAN 连接，ip 范围：10.1.1.0/24

我注意到脚本到了这一行：

iptables -A INPUT -m state --state NEW -i ! wlan0 -j ACCEPT

出现以下错误：

Bad argument `wlan0'
Try `iptables -h' or 'iptables --help' for more information.

作为 iptables 的新手，我不太清楚哪里出了问题。

有人能帮我解答这个问题吗？

答案1

为了供将来参考或供任何查看此页面的人使用，以下是完成的脚本：

#!/bin/sh

PATH=/usr/sbin:/sbin:/bin:/usr/bin

#
# delete all existing rules.
#
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X

# Always accept loopback traffic
iptables -A INPUT -i lo -j ACCEPT

# Allow established connections, and those not coming from the outside
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW ! -i wlan0 -j ACCEPT
iptables -A FORWARD -i wlan0 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow outgoing connections from the LAN side.
iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT

# Masquerade.
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

# Don't forward from the outside to the inside.
iptables -A FORWARD -i wlan0 -o wlan0 -j REJECT

#Port Forward Unifed remote
iptables -A INPUT -p tcp --dport 9512 -j ACCEPT -i wlan0
iptables -t nat -A PREROUTING -p tcp --dport 9512 -j DNAT --to-destination 10.1.1.12:9512
iptables -t nat -A POSTROUTING -d 10.1.1.12 -p tcp --dport 9512 -j SNAT --to-source 10.1.1.1

# Drop outside traffic except ssh
iptables -A INPUT -p tcp --dport ssh -j ACCEPT -i wlan0
iptables -A INPUT -j DROP -p tcp -i wlan0

# Enable routing.
echo 1 > /proc/sys/net/ipv4/ip_forward

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