我正在尝试在我的 iptable 配置中添加 FTP 端口，我怀疑这是我无法通过 FileZilla 访问我的 FTP 的原因。
/etc/iptables.firewall.rules
*filter
# Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 -j REJECT
# Accept all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Allow all outbound traffic - you can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT
# Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL).
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
# Allow SSH connections
#
# The -dport number should be the same port number you set in sshd_config
#
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT
# Just added for FTP
-A INPUT -p tcp -m tcp --dport 21 -m conntrack --ctstate ESTABLISHED -j ACCEPT -m comment --comment "Allow ftp connections on port 21"
-A OUTPUT -p tcp -m --dport 21 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT -m comment --comment "Allow ftp connections on port 21"
-A INPUT -p tcp -m tcp --dport 20 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT -m comment --comment "Allow ftp connections on port 20"
-A OUTPUT -p tcp --dport 20 -m conntrack --ctstate ESTABLISHED -j ACCEPT -m comment --comment "Allow ftp connections on port 20"
# Allow ping
-A INPUT -p icmp -j ACCEPT
# Log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7
# Drop all other inbound - default deny unless explicitly allowed policy
-A INPUT -j DROP
-A FORWARD -j DROP
COMMIT
我唯一添加的是评论下方的脚本# Just added for FTP
现在，当我尝试使用它加载时，iptables-restore < /etc/iptables.firewall.rules出现如下错误：
iptables-restore v1.4.12: Couldn't load match `--dport':No such file or directory
Error occurred at line: 25
我不是这方面的专家，这是我的个人 VPS 盒，我用它来进行随机练习。
原因似乎是什么？
答案1
这是一个打字错误。
你有：
-m --dport
应该是：
-m tcp --dport