linux - 无法在 IPTABLES 防火墙上打开端口

Question

我很难理解为什么我无法通过添加 IPTABLES 规则来打开端口 61616。以下是通过 IPTABLES -L 命令获取的所有规则的列表。

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:61616
ACCEPT     udp  --  anywhere             anywhere            udp dpt:cslistener
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:cslistener
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:webcache
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:smtp
RH-Firewall-1-INPUT  all  --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
RH-Firewall-1-INPUT  all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain RH-Firewall-1-INPUT (2 references)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:61616
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:http
ACCEPT     all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere            icmp any
ACCEPT     esp  --  anywhere             anywhere
ACCEPT     ah   --  anywhere             anywhere
ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:mdns
ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ipp
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited

尽管我对 IPTABLES 一无所知，但令我困惑的是，http 端口从外部是可见的，但端口 61616 仍然不可见。对我来说，规则看起来是一样的。无论如何，感谢所有帮助。

最佳

Answer 1

也许您尝试为 CentOS 主机后面的网络中的主机打开端口(CentOS 主机是网络的防火墙)？如果是这样，您必须为表过滤器的链 FORWARD 添加规则，并且您应该将 DNAT 规则添加到网络 x.x.x.x 中的某些 IP

iptables -A FORWARD -p tcp --dport 61616 -j  ACCEPT
iptables -A PREROUTING -t nat -p tcp --dport 61616 -j DNAT --to-destinanion x.x.x.x