iptables 规则是否正确？

Question

我从 bash 脚本输入这个

#!/bin/bash
#
# iptables example configuration script

# Drop ICMP echo-request messages sent to broadcast or multicast addresses
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Drop source routed packets
echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route
 
# Enable TCP SYN cookie protection from SYN floods
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
 
# Don't accept ICMP redirect messages
echo 0 > /proc/sys/net/ipv4/conf/all/accept_redirects
 
# Don't send ICMP redirect messages
echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects
 
# Enable source address spoofing protection
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
 
# Log packets with impossible source addresses
echo 1 > /proc/sys/net/ipv4/conf/all/log_martians
 
# Flush all chains
/sbin/iptables --flush
 
# Allow unlimited traffic on the loopback interface
/sbin/iptables -A INPUT -i lo -j ACCEPT
/sbin/iptables -A OUTPUT -o lo -j ACCEPT
 
# Set default policies
/sbin/iptables --policy INPUT DROP
/sbin/iptables --policy OUTPUT DROP
/sbin/iptables --policy FORWARD DROP
 
# Previously initiated and accepted exchanges bypass rule checking
# Allow unlimited outbound traffic
/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT


/sbin/iptables -A INPUT -p tcp --dport 69 -m state --state NEW -m recent --update --seconds 60 --hitcount 4 -j DROP
/sbin/iptables -A INPUT -p tcp --dport 69 -m state --state NEW -m recent --set
/sbin/iptables -A INPUT -p tcp --dport 69 -m state --state NEW -j ACCEPT
 
# Allow certain ports to be accessible from the outside
/sbin/iptables -A INPUT -p tcp --dport 25565 -m state --state NEW -j ACCEPT  #Minecraft
/sbin/iptables -A INPUT -p tcp --dport 1688 -m state --state NEW -j ACCEPT   #Dynmap plugin

# Other rules for future use if needed.  Uncomment to activate
/sbin/iptables -A INPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT    # http
/sbin/iptables -A INPUT -p tcp --dport 443 -m state --state NEW -j ACCEPT   # https

# UDP packet rule.  This is just a random udp packet rule as an example only
# /sbin/iptables -A INPUT -p udp --dport 5021 -m state --state NEW -j ACCEPT

# Allow pinging of your server
/sbin/iptables -A INPUT -p icmp --icmp-type 8 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

  
# Drop all other traffic
/sbin/iptables -A INPUT -j DROP

# print the activated rules to the console when script is completed
/sbin/iptables -nL

并得到这个

的输出

firewall.sh: line 38: DROP: command not found
firewall.sh: line 39: tcp: command not found
firewall.sh: line 43: -p: command not found
firewall.sh: line 46: --dport: command not found

它奇怪的即时迁移服务器和旧服务器上的这个脚本运行很好是我没有看到的脚本有问题吗？我托管的是带有 raspibian x64 的 pi4 8gb 是否有可能目前正在给我 iptables 的问题？还是代码？

Answer 1

您指出的错误很可能是由于文件中存在 window-style 行结尾引起的。您可以尝试使用 cat -A <filename> 进行调试，并使用以下命令将您的文件转换为 Linux 样式的行结尾。

dos2unix <file>

iptables 规则是否正确？

iptables rules is this correct?

shell

iptables