ISDN路由器的高级设置(下)

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。

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