IP Firewall Service

3

 

Firewall service is software that protects the network applications running on your Mac OS X Server. Turning on firewall service is similar to erecting a wall to limit access. Firewall service scans incoming IP packets and rejects or accepts these packets based on the set of filters you create. You can restrict access to any IP service running on the server, and you can customize filters for all incoming clients or for a range of client IP addresses.

The illustration below shows an example firewall process.

 

 

 

Is there a

filter

No

 

 

 

Locate the

 

 

 

 

 

 

 

 

 

 

 

for port 80?

 

 

 

 

 

Any Port filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with the most

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

specific range

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

that includes

A computer with IP

The server begins

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the address

 

 

 

 

 

address 10.221.41.33

looking for filters.

 

 

10.221.41.33.

attempts to connect to

 

 

Is there a filter

 

 

 

 

 

 

 

 

 

containing

 

 

 

 

 

 

 

the server over the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IP address

 

 

 

 

 

 

 

Internet (port 80).

 

 

 

 

 

 

 

 

 

10.221.41.33?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

What does the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

filter specify?

 

 

 

 

 

 

 

 

 

 

 

 

 

Deny

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connection

 

 

 

 

 

Connection

 

 

 

is made.

 

 

 

 

 

is refused.

43

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Image 43
Apple 034-2351_Cvr manual IP Firewall Service

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