Ubuntu12.04防火墙内网配置

Posted 2020-08-02

因大量使用Ubuntu12.04，无力购买硬件防火墙，于是使用iptables进行简单的策略控制；

Ubuntu12.04自带的防火墙软件ufw，管控服务及端口很easy但是对于强大的iptables还是有差距；

于是卸载

    apt-get remove ufw -y

此版本的Ubuntu的iptables与RedHat配置上很不相同

1. RedHat方式：

RedHat只需将配置写到/etc/sysconfig/iptables文件

然后

/etc/init.d/iptables reload

iptables -nL

2. Ubuntu方式

Ubuntu居然不是这样，

Ubuntu的iptables不是服务

执行iptables-save

报错信息显示未创建/etc/network/iptables

iptables-restore < /etc/network/iptables        #转存规则

iptables-save                    #保存规则

iptables -nL                     #查看规则

3. 配置文件规则示例

# Generated by iptables-save v1.4.21 on Tue May 17 03:39:50 2016

*nat

:PREROUTING ACCEPT [36:5869]

:INPUT ACCEPT [36:5869]

:OUTPUT ACCEPT [15:939]

:POSTROUTING ACCEPT [15:939]

COMMIT

# Completed on Tue May 17 03:39:50 2016

# Generated by iptables-save v1.4.21 on Tue May 17 03:39:50 2016

*mangle

:PREROUTING ACCEPT [1085:768611]

:INPUT ACCEPT [1085:768611]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [720:76434]

:POSTROUTING ACCEPT [720:76434]

COMMIT

# Completed on Tue May 17 03:39:50 2016

# Generated by iptables-save v1.4.21 on Tue May 17 03:39:50 2016

*filter

:INPUT ACCEPT [836:749295]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [720:76434]

# git

-A INPUT -s 192.168.3.13/32 -p tcp -m tcp --dport 29418 -j ACCEPT

-A INPUT -s 192.168.3.12/32 -p tcp -m tcp --dport 29418 -j ACCEPT

-A INPUT -s 192.168.3.11/32 -p tcp -m tcp --dport 29418 -j ACCEPT

-A INPUT -s 192.168.3.10/32 -p tcp -m tcp --dport 29418 -j ACCEPT

-A INPUT -p tcp -m tcp --dport 29418 -j DROP

# xrdp

-A INPUT -s 192.168.3.10/32 -p tcp -m tcp --dport 3389 -j ACCEPT

-A INPUT -p tcp -m tcp --dport 3389 -j DROP

# ssh

-A INPUT -s 192.168.3.13/32 -p tcp -m tcp --dport 22 -j ACCEPT

-A INPUT -s 192.168.3.12/32 -p tcp -m tcp --dport 22 -j ACCEPT

-A INPUT -s 192.168.3.11/32 -p tcp -m tcp --dport 22 -j ACCEPT

-A INPUT -p tcp -m tcp --dport 22 -j DROP

COMMIT

本文出自 “M层” 博客，请务必保留此出处http://mengix.blog.51cto.com/7194660/1794970