Apple Mac OS X Server (version 10.2.3 or later) Instrukcja Użytkownika Pobierz pdf (Strona 566)

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566 Chapter 15

The segments in a mask go from general to speciﬁc, so the earlier a zero appears in the

segments of the subnet mask, the wider the resulting range of addresses. A subnet mask of

255.255.255.255 is the narrowest and indicates a single IP address.

Any value except 255 in a segment of the subnet mask must be followed by zero segments.

The following subnet mask examples are invalid, because in each case, a value other than 255

is followed by a non-zero value:

m 255.255.128.255

m 255.0.128.128

m 255.255.252.255

Using Address Ranges

When you create ﬁlters using Server Settings, you enter an IP address and a subnet mask.

Server Settings shows you the resulting address range, and you can change the range by

modifying the subnet mask. When you indicate a range of possible values for any segment of

an address, that segment is called a wildcard. The following table gives examples of address

ranges created to achieve speciﬁc goals.

Goal

Sample

IP address Subnet mask Address range

Create a ﬁlter that speciﬁes a

single IP address.

10.221.41.33 255.255.255.255 10.221.41.33

(single address)

Create a ﬁlter that leaves the

last segment of the IP address

range as a wildcard.

10.221.41.33 255.255.255.0 10.221.41.0 to

10.221.41.255

Create a ﬁlter that leaves part of

the third segment and all of the

fourth segment as a wildcard.

10.221.41.33 255.255.252.0 10.221.40.0 to

10.221.43.255

Create a ﬁlter that applies to all

incoming addresses.

Select “All IP

addresses”

All IP addresses

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