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58
Calculating the mask for IP access control
The IP access control function uses a standard IP address and a net mask
notation to specify both single locations and ranges of addresses. In order to
use this function correctly, you need to calculate the mask so that it accurately
encompasses the required address(es).
Single locations
Some of the simplest addresses to allow or deny are single locations. In this case
you enter the required IP address into the ‘Network/Address’ field and simply
enter the ‘Mask’ as 255.255.255.255 (255 used throughout the mask means
that every bit of the address will be compared and so there can only be one
unique address to match the one stated in the ‘Network/Address’ field).
All locations
The other easy setting to make is ALL addresses, using the mask 0.0.0.0 As
standard, the IP access control section includes the entry:
+
0.0.0.0/0.0.0.0
The purpose of this entry is to include all IP addresses. It is possible to similarly
exclude all addresses, however, take great care not to do this as you instantly
render all network access void. There is a recovery procedure should this occur.
Address ranges
Although you can define ranges of addresses, due to the way that the mask
operates, there are certain restrictions on the particular ranges that can be set.
For any given address you can encompass neighbouring addresses in blocks of
either 2, 4, 8, 16, 32, 64, 128, etc. and these must fall on particular boundaries.
For instance, if you wanted to define the local address range:
192.168.142.67 to 192.168.142.93
The closest single block to cover the range would be the 32 addresses from:
192.168.142.64 to 192.168.142.95.
The mask needed to accomplish this would be: 255.255.255.224
When you look at the mask in binary, the picture becomes a little clearer. The
above mask has the form: 11111111.11111111.11111111.11100000
Ignoring the initial three octets, the final six zeroes of the mask would ensure
that the 32 addresses from .64 (01000000) to .95 (01011111) would all be
treated in the same manner. See Net masks - the binary explanation for
details.
When defining a mask, the important rule to remember is:
There must be no ‘ones’ to the right of a ‘zero’.
For instance, (ignoring the first three octets) you could not use a mask that had
11100110 because this would affect intermittent addresses within a range in an
impractical manner. The same rule applies across the octets. For example, if you
have zeroes in the third octet, then all of the fourth octet must be zeroes.
The permissible mask values (for all octets) are as follows:
Mask octet Binary Number of addresses encompassed
255 11111111 1 address
254 11111110 2 addresses
252 11111100 4 addresses
248 11111000 8 addresses
240 11110000 16 addresses
224 11100000 32 addresses
192 11000000 64 addresses
128 10000000 128 addresses
0 00000000 256 addresses
If the access control range that you need to define is not possible using one
address and one mask, then you could break it down into two or more entries.
Each of these entries could then use smaller ranges (of differing sizes) that,
when combined with the other entries, cover the range that you require.
For instance, to accurately encompass the range in the earlier example:
192.168.142.67 to 192.168.142.93
You would need to define the following six address and mask combinations in
the IP access control section:
Network/address entry Mask entry
192.168.142.67 255.255.255.255 defines 1 address (.67)
192.168.142.68 255.255.255.252 defines 4 addresses (.68 to .71)
192.168.142.72 255.255.255.248 defines 8 addresses (.72 to .79)
192.168.142.80 255.255.255.248 defines 8 addresses (.80 to .87)
192.168.142.88 255.255.255.252 defines 4 addresses (.88 to .92)
192.168.142.93 255.255.255.255 defines 1 address (.93)
- AdderLink iPEPS 1
- Contents 2
- Further information 3
- Introduction 4
- What’s in the box 6
- Installation 7
- Connections 8
- IP network port 9
- ADDERLINK 10
- 11
- 11
- 11
- > > 12
- Encryption settings 14
- 192.168.1.42 17
- Part 2 – Remote configuration 19
- Networking issues 20
- Internet 21
- Operation 23
- Using the viewer window 27
- Mouse pointers 28
- Access mode - shared/private 28
- Re-synchronise mouse 28
- Auto calibrate 29
- Controls 29
- Viewer encryption settings 35
- Supported web browsers 35
- Unit configuration 38
- Network configuration 39
- Reset configuration 40
- Clear IP access control 41
- Colour/Encoding 42
- Identities 45
- Load / Save 45
- Encoding and colour level 47
- Security 47
- User accounts 49
- Advanced unit configuration 51
- Time & date configuration 52
- Setting IP access control 54
- Hotkey sequences 55
- Logging and status 56
- IP addresses 57
- Net masks 57
- Web server 60
- Permissible key presses 62
- Creating macro sequences 62
- Warranty 64
- Safety information 64
- End user licence agreement 65
- Radio Frequency Energy 66
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Anhang 38
10
Einführung
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Lieferumfang
12
Bedienfeld
14
Navigation
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Numerisch
17
<Typ 2>
19
50"
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• WXGA-Reihe
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• 720p-Reihe
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OSD-Menüs
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DynamicBlack
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Erweitert
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Einstellung
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Verwaltung
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Présentation
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Français
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Bien débuter
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<Type 2>
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Réglages
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Appendices
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Messages OSD
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Messages DEL
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Apéndices 38
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Introducción
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Navegación
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Numérico
17
<Tipo 2>
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50"
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• serie WXGA
24
• serie 720p
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Temp. Color
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Avanzado
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Apéndices
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Appendici 38
10
Introduzione
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Italiano
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Preparazione
18
<Tipo 2>
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Immagine
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Impostazione
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Gestione
41
Appendici
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Messaggi OSD
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Messaggi LED
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Specifiche
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Bevezetés
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Vezérlőpult
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Első lépések
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<2. típus>
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50"
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Speciális
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Beállítás
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Függelékek
48
OSD üzenetek
51
LED üzenetek
52
Lámpacsere
54
8 mm átmérő
56
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Contents
9
Introduction
11
<Type 2>
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50"
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Temperature
35
Advanced
35
Management
41
Language
43
Appendices
48
OSD Messages
51
LED Messages
52
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Tabla de contenidos
Ελληνικά
5
Français
6
Hrvatski
6
Italiano
7
Ghid rapid
10
Slovenščina
11
Slovenčina
11
Suomalainen
12
SNABBSTART
13
クィックスタート
15
Tiếng Việt
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Український
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