在 iptables 規則上添加 FTP 埠時出錯

我正在嘗試在我的 iptable 配置中添加 FTP 埠，我懷疑這是我無法通過 FileZilla 訪問我的 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

我唯一添加的是評論下方的腳本**# Just added for FTP**

現在，當我嘗試使用載入它時，iptables-restore < /etc/iptables.firewall.rules會發生這樣的錯誤：

iptables-restore v1.4.12: Couldn't load match `--dport':No such file or directory

Error occurred at line: 25

我不是這裡的專家，這是我用於隨機練習的個人 VPS 盒子。

似乎是什麼原因？

這是一個錯字。

你有：

-m --dport

它應該是：

-m tcp --dport

引用自：https://serverfault.com/questions/566272