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3 IP Firewall Service
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
for port 80?
Locate the
Any Port filter
with the most
specific range
that includes
the address
10.221.41.33.
A computer with IP
address 10.221.41.33
attempts to connect to
the server over the
Internet (port 80).
The server begins
looking for filters.
Is there a filter
containing
IP address
10.221.41.33?
Yes
Connection
is refused.
Yes
What does the
filter specify?
Connection
is made.
Allow
No
Deny
LL2351.Book Page 43 Monday, September 8, 2003 2:47 PM