我正在尝试在我的服务器上打开端口3500但是失败了.
我开始使用这个命令:(从http://wiki.centos.org/HowTos/Network/IPTables开始)
iptables -A INPUT -p tcp --dport 3500 -j ACCEPT
但后来我运行iptables -L我仍然没有看到列出的新规则:(我的假设它应该在输出中包含3500)
Chain INPUT (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ACCEPT tcp -- anywhere anywhere tcp dpt:rtmp-port 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 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 udp -- anywhere anywhere state NEW udp dpt:snmp ACCEPT udp -- anywhere anywhere state NEW udp dpt:snmptrap ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:http ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
编辑
所以我尝试将ACCEPT规则插入到INPUT链中,我的iptables现在看起来像这样：
Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3500 RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0
但它不允许我从外面连接到3500. (我仍然可以从内部进行远程登录).当我试图telnet my_host 3500时,我得到这个：telnet：无法连接到远程主机：连接被拒绝
编辑2：我的netstat -an | grep“LISTEN”输出：
tcp 0 0 127.0.0.1:3500 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:973 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:*听
tcp 0 0 127.0.0.1:25 0.0.0.0:*听听
tcp 0 0 ::: 22 ::: * LISTEN
编辑3：我跟着lain建议,也让我的服务绑定到0.0.0.0:3500而不是127.0.0.1:3500它的工作原理.
iptables -L -n
您还使用-A开关将规则添加到INPUT链.这是在数据包发送到RH-Firewall-1-INPUT链之后添加的,其最后一条规则是一揽子REJECT,因此发往端口3500的数据包将在它们在INPUT链中进行测试之前被拒绝.
您有几种可能的解决方案 – 使用-I开关将规则插入INPUT链或RH-Firewall-1-INPUT链
iptables -I INPUT -p tcp --dport 3500 -j ACCEPT
要么
iptables -I RH-Firewall-1-INPUT -p tcp --dport 3500 -j ACCEPT
你也应该清理你的规则,你可以使用
iptables -D INPUT -p tcp --dport 3500 -j ACCEPT
(多次)在添加新规则之前删除端口3500的现有规则.