Reviewing IP Filter Rules

Rule number	Used by firewall module for
63300	Denying access for igmp. Created when Deny IGMP is selected in
	the Advanced pane of the Configure Firewall window.

63400	Allowing any TCP or UDP packet to access port 111 (needed by
	NetInfo). Created when a shared NetInfo domain is found on the
	server.

63500	Allowing user-specified TCP and UDP packets to access ports
	needed for NetInfo shared domains. You can configure NetInfo to
	use a static port or to dynamically select a port from 600 through
	1023. Then use the Configure Firewall window to allow all or
	specific clients to access those ports.

64000–65000	User-defined filters for Default.

To review the rules currently defined for your server, use the Terminal application to submit the ipfw show command. The show command displays four columns of information:

Column	Information
1	The rule number. The lower the number, the higher the priority of
	the rule.

2	The number of times the filter has been applied since it was
	defined.

3	The number of bytes to which the filter has been applied.

4	A description of the rule.

When you type:

ipfw show

You will see information similar to this:

0010 260	32688	allow log ip from any to any via lo*
0020 0	0	deny log ip from 127.0.0.0/8 to any in
0020 0	0	deny log ip from any to 127.0.0.0/8 in
0030 0	0	deny log ip from 224.0.0.0/3 to any in
0040 0	0	deny log tcp from any to 224.0.0.0/3 in
001001	52	allow log tcp from 111.222.33.3 to 111.222.31.3 660
in
...

Creating IP Filter Rules

To create new rules, use the ipfw add command. The following example defines rule 200, a filter that prevents TCP packets from a client with IP address 10.123.123.123 from accessing port 80 of the system with IP address 17.123.123.123:

ipfw add 200 deny tcp from 10.123.123.123 to 17.123.123.123 80

Chapter 3 IP Firewall Service

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Rule number