关于IPFW明示允许规则集的一些疑问

本帖最后由 migoumigou 于 2011-04-22 17:22 编辑

初学ipfw，是小菜，所以有些疑问请教
内核编译的时候，已经放入了options IPFIREWALL_DEFAULT_TO_ACCEPT
现在想要做一个明示允许的规则集，除了规则集中列出的MAC列表allow，其他都deny，这样写的：
ipfw -q -f flush
ipfw -q add 00050 divert 8668 ip4 from any to any via bge0
ipfw -q add 00100 allow ip from any to any via lo0
ipfw -q add 00200 deny ip from any to 127.0.0.0/8
ipfw -q add 00300 deny ip from 127.0.0.0/8 to any
ipfw -q add 00400 allow ip from any to any MAC x0:0x:0x:0x:0x:0x any
ipfw -q add 00500 allow ip from any to any MAC x0:0x:0x:0x:0x:0x any
ipfw -q add 00600 allow ip from any to any MAC x0:0x:0x:0x:0x:0x any
ipfw -q add 65535 deny ip from any to any
重启加载规则后ipfw list，前面的几项规则都显示正常，唯独65535还是
65535 allow ip from any to any
然后规则中MAC列表以外的机器仍可以正常通过防火墙连接外网

请问是规则集写的有问题吗？烦请指出哪里有问题？
如果规则集没有问题，那是不是明示允许的规则，前提是必须把内核中的options IPFIREWALL_DEFAULT_TO_ACCEPT拿掉，重新编译内核，才能让上面的规则集正常运作？

作者: migoumigou 发布时间: 2011-04-22

kernel里面的那个是最后的默认设置吧。

作者: fender0107401 发布时间: 2011-04-22

那你就用下面一句，65535那句你不可能把它重新定义，而是会有两个65535，加上65534后，65535永远不起作用：
ipfw -q add 65534 deny ip from any to any

作者: lsstarboy 发布时间: 2011-04-22

Check this！

################################################################################
# delete all rules
ipfw -q -f flush
# variable declaration
nic="re0"
dns1="+++"
dns2="+++"
dhcp="192.168.1.1"
cmd="ipfw -q add "
ks="keep-state"
################################################################################
# loopback
$cmd 00100 allow all from any to any via lo0
$cmd 00200 check-state
################################################################################
# dns
$cmd 00300 allow tcp from me to $dns1 53 out via $nic setup $ks
$cmd 00400 allow udp from me to $dns2 53 out via $nic $ks
$cmd 00500 allow tcp from me to $dns1 53 out via $nic setup $ks
$cmd 00600 allow udp from me to $dns2 53 out via $nic $ks
# dhcp
$cmd 00700 allow udp from me to $dhcp 67 out via $nic $ks
################################################################################
# www
$cmd 00800 allow tcp from me to any 80 out via $nic setup $ks
# secure www
$cmd 00920 allow tcp from me to any 443 out via $nic setup $ks
# email
$cmd 01000 allow tcp from me to any 587 out via $nic setup $ks
$cmd 01100 allow tcp from me to any 995 out via $nic setup $ks
# irc
$cmd 01200 allow tcp from me to any 7000 out via $nic setup $ks
# ftp
$cmd 01300 allow tcp from me to any 21 out via $nic setup $ks
$cmd 01400 allow tcp from me to any 1024-65535 out via $nic setup $ks
# ntp
$cmd 01500 allow udp from me to any 123 out via $nic $ks
# csup
$cmd 01600 allow tcp from me to any out via $nic setup $ks uid root
################################################################################

复制代码

作者: fender0107401 发布时间: 2011-04-22

关于IPFW明示允许规则集的一些疑问

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