举例:
开放10000端口的解决步骤如下:
1、修改/etc/sysconfig/iptables文件,增加如下一行:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 10000 -j ACCEPT
重启 iptables
service iptables restart2、重启防火墙,这里有两种方式重启防火墙
a) 重启后生效
开启: chkconfig iptables on关闭: chkconfig iptables off
b) 即时生效,重启后失效
开启: service iptables start关闭: service iptables stop
3、或者用menu-system-administration-firewall
去添加用户需要的端口。
By the way:
a. netstat -tanp 去显示端口状态。
/usr/sbin/lsof -i
b. telnet ipaddr port
to check if ip and port is available before making connection.
http://www.cnblogs.com/simonhaninmelbourne/archive/2012/10/06/2713233.html
LINUX通过下面的命令可以开启允许对外访问的网络端口:
/sbin/iptables -I INPUT -p tcp --dport 8000 -j ACCEPT #开启8000端口
/etc/rc.d/init.d/iptables save #保存配置
/etc/rc.d/init.d/iptables restart #重启服务
查看端口是否已经开放
/etc/init.d/iptables status
Linux中如何开启8080端口供外界访问
装好Tomcat7后,发现除了本机能访问外界访问不了,岂有此理。于是请教百度大神,在费一番周折后,总结步骤如下:
1.修改文件/etc/sysconfig/iptables
[root@bogon ~]# cd /etc/sysconfig/
[root@bogon sysconfig]# vi iptables
文件内容如下,注意红色一行是新加的,目的是对外界开放8080端口
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
这行文字实际是从上一行拷贝修改而来,在VI中拷贝一行用yy,拷贝多行用yyn,粘贴用p。还算方便的。
2.将iptables服务重启。
[root@bogon sysconfig]# service iptables restart
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: [ OK ]
Loading additional iptables modules: ip_conntrack_ftp [ OK ]
[root@bogon sysconfig]#
3.如若不想修改iptables表,可以直接输入下面命令:
# iptables -I INPUT -p tcp --dport 80 -j ACCEPT
http://www.cnblogs.com/xiandedanteng/archive/2013/08/28/3287751.html