
首页 > 网管技术 > 网络设备 > 正文

ISDN路由器的高级设置(下)

来源:本文出自:http://comp.zz.ha.cn/ 作者: 叶扬 (2001-08-17 12:00:00)

封锁非法Web站点

互联网上的网站品质良莠不齐，还有很多非法、反动站点。本例即是讲解如何设置过滤器，以达到封锁非法Web站点的目的。

例如，我们想禁止用户访问XXX.XXX.XX.XXX站点，就可以进行如下设置：

1．首先在Menu 21中建立一个过滤项

Menu 21 - Filter Set Configuration
Filter Filter
Set # Comments Set # Comments
1 Block a Web7 7
2 8
3 9
4 10
5 11
6 12
Enter Filter Set Number to Configure= 0
Edit Comments=
Press ENTER to Confirm or ESC to Cancel:

2．然后在过滤项中建立一条过滤规则

Menu 21.1.1 - TCP/IP Filter Rule
Filter #: 1,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 0 IP Source Route= No
Destination: IP Addr= XXX.XXX.XX.XXX
IP Mask= 255.255.255.255
Port #=
Port # Comp= None
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #=
Port # Comp= None
TCP Estab= N/A
More= No Log= None
Action Matched= Drop
Action Not Matched= Forward
Press ENTER to Confirm or ESC to Cancel:

3．最后在Menu 3．1的＇Input Filter Set＇中激活该过滤项就可以了

Menu 3.1 - General Ethernet Setup
Input Filter Sets:
protocol filters=1
device filters=
Output Filter Sets:
protocol filters=
device filters=

设置防火墙

P100IH具有简单的防火墙功能，通过对数据封包的过滤，可以阻挡来自互联网上黑客的攻击。简单的防火墙的端口设置如下：

· 允许 ARP、ICMP、Ping；

· 允许 TCP、UDP ＞ 1023的传输端口；

· 允许 HTTP、SMTP、MNTP、DNS；

· 阻止其它任何来自于Internet的数据包。

设置过滤器过程如下：

1．在Menu 21中建立一个过滤项

Menu 21 - Filter Set Configuration
Filter Filter
Set # Comments Set # Comments
1 Firewall 7 7
2 8
3 9
4 10
5 11
6 12
Enter Filter Set Number to Configure= 0
　Edit Comments=
Press ENTER to Confirm or ESC to Cancel:

2．分别建立四条过滤规则：Menu 21．1．1，Menu 21．1．2，Menu 21．1．3，……

规则1：允许ICMP（包括Ping）

Menu 21.1.1 - TCP/IP Filter Rule
Filter #: 1,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 1 IP Source Route= No
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 0
Port # Comp= None
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 0
Port # Comp= None
TCP Estab= No
More= No Log= None
Action Matched= Forward
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:

规则2：允许UDP端口＞1023

Menu 21.1.2 - TCP/IP Filter Rule
Filter #: 1,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 17 IP Source Route= No
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 1023
Port # Comp= Greater
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 0
Port # Comp= None
TCP Estab= No
More= No Log= None
Action Matched= Forward
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:

规则3：允许TCP端口＞1023

Menu 21.1.3 - TCP/IP Filter Rule
Filter #: 1,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 6 IP Source Route= No
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 1023
Port # Comp= Greater
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 0
Port # Comp= None
TCP Estab= No
More= No Log= None
Action Matched= Forward
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:

规则4：允许DNS请求，阻止所有其它的数据封包

Menu 21.1.5 - TCP/IP Filter Rule
Filter #: 1,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 17 IP Source Route= No
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 53
Port # Comp= Equal
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 0
Port # Comp= None
TCP Estab= No
More= No Log= None
Action Matched= Forward
Action Not Matched= Drop
Press ENTER to Confirm or ESC to Cancel:

以上4条过滤规则的汇总选单Menu 21，如下所示：

3．最后，在Menu 3．1的＇Input Filter Set＇中激活该过滤项就可以了

Menu 3.1 - General Ethernet Setup
Input Filter Sets:
protocol filters=1
device filters=
Output Filter Sets:
protocol filters=
device filters=

本文介绍了设置P100IH路由器的方法，读者可以照搬，也可以根据以上方法，灵活运用过滤器这个工具。只有加强对ISDN路由器的管理，才能保证ISDN合法用户的使用权。

(http://www.fanqiang.com)

相关文章


★ 感谢所有的作者为我们学习技术知识提供了一条捷径 ★ www.fanqiang.com