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Subnetting, Table 42

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Appendix B IP Addresses and Subnetting Table 42 Alternative Subnet Mask Notation (continued) SUBNET MASK ALTERNATIVE NOTATION LAST OCTET (BINARY) LAST OCTET (DECIMAL) 255.255.255.192 /26 1100 0000 192 255.255.255.224 /27 1110 0000 224 255.255.255.240 /28 1111 0000 240 255.255.255.248 /29 1111 1000 248 255.255.255.252 /30 1111 1100 252 Subnetting You can use subnetting to divide one network into multiple sub-networks. In the following example a network administrator creates two sub-networks to isolate a group of servers from the rest of the company network for security reasons. In this example, the company network address is 192.168.1.0. The first three octets of the address (192.168.1) are the network number, and the remaining octet is the host ID, allowing a maximum of 28 - 2 or 254 possible hosts. The following figure shows the company network before subnetting. Figure 76 Subnetting Example: Before Subnetting You can "borrow" one of the host ID bits to divide the network 192.168.1.0 into two separate sub-networks. The subnet mask is now 25 bits (255.255.255.128 or /25). The "borrowed" host ID bit can have a value of either 0 or 1, allowing two subnets; 192.168.1.0 /25 and 192.168.1.128 /25. The following figure shows the company network after subnetting. There are now two subnetworks, A and B. 138 PLA450 User's Guide

Section	Page
PLA450 Series	1
User’s Guide	1
About This User's Guide	3
Document Conventions	4
Safety Warnings	6
Contents Overview	9
Table of Contents	11
List of Figures	15
List of Tables	19
Introduction	21
Getting to Know Your PLA450	23
1.1 Overview	23
1.1.1 Wireless LAN Application	23
1.1.2 HomePlug AV	23
1.2 Ways to Manage the PLA450	24
1.3 Good Habits for Managing the PLA450	24
1.4 LEDs	25
The WPS Button	27
2.1 Overview	27
2.2 Push Button Configuration	27
The ENCRYPT Button	29
3.1 ENCRYPT Button Overview	29
3.2 Set Up a HomePlug AV Network with ENCRYPT	29
3.3 Setting Up Multiple Networks	31
3.4 ENCRYPT Button Behavior	32
Introducing the Web Configurator	35
4.1 Web Configurator Overview	35
4.2 Accessing the Web Configurator	35
4.3 Resetting the PLA450	37
4.3.1 Procedure to Use the Reset Button	37
4.4 Navigating the Web Configurator	37
4.4.1 The Status Screen	37
4.4.2 Navigation Panel	40
4.4.3 Summary: Packet Statistics	41
4.4.4 Summary: Wireless Station Status	42
4.4.5 Summary: My HomePlug Network Status	42
Wireless Tutorial	47
5.1 Example Parameters	47
5.2 Configuring the PLA450	47
5.3 Configuring the Wireless Client	49
5.3.1 Connecting to a Wireless LAN	49
5.3.2 Creating and Using a Profile	52
Network	55
Wireless LAN	57
6.1 Wireless Network Overview	57
6.2 Wireless Security Overview	59
6.2.1 SSID	59
6.2.2 MAC Address Filter	59
6.2.3 User Authentication	59
6.2.4 Encryption	60
6.3 Roaming	61
6.3.1 Requirements for Roaming	62
6.4 Quality of Service	62
6.4.1 WMM QoS	63
6.5 WPS Overview	63
6.5.1 WPS Setup Using a PIN	64
6.5.2 How WPS Works	65
6.5.3 Limitations of WPS	67
6.6 General Wireless LAN Screen	68
6.6.1 No Security	69
6.6.2 WPA-PSK/WPA2-PSK	70
6.7 MAC Filter	71
6.8 Wireless LAN Advanced Screen	72
6.9 Quality of Service (QoS) Screen	74
6.9.1 Application Priority Configuration	76
6.10 WPS Screen	77
6.11 WPS Station Screen	78
LAN	81
7.1 LAN Overview	81
7.1.1 Factory LAN Defaults	81
7.1.2 IP Address	81
7.1.3 IP Address and Subnet Mask	82
7.2 LAN IP Screen	82
HomePlug AV	85
8.1 Overview	85
8.2 Privacy and Powerline Adapters	86
8.2.1 Setting Up a Private Powerline Network	87
8.2.2 Setting Up Multiple Powerline Networks.	87
8.3 Configuring Your HomePlug AV Devices	88
8.4 HomePlug AV QoS	91
8.4.1 QoS Based on IP or MAC Address	91
8.4.2 Mapping other QoS Priority Settings to HomePlug AV QoS	91
8.4.3 QoS Based on Traffic Type	92
Maintenance and Troubleshooting	95
System	97
9.1 System General Screen	97
9.2 Time Setting Screen	98
Logs	101
10.1 View Log	101
10.2 Log Settings	102
Tools	105
11.1 Firmware Upload Screen	105
11.2 Configuration Screen	107
11.2.1 Backup Configuration	107
11.2.2 Restore Configuration	107
11.2.3 Back to Factory Defaults	108
11.3 Restart Screen	109
Configuration Mode	111
Language	113
13.1 Selecting Language	113
Troubleshooting	115
14.1 Power, Hardware Connections, and LEDs	115
14.2 PLA450 Access and Login	116
14.3 Internet Access	117
14.4 Resetting the PLA450 to Its Factory Defaults	118
14.5 Wireless Troubleshooting	119
14.6 HomePlug AV Troubleshooting	119
14.7 ENCRYPT Button Problems	120
14.8 Advanced Features	121
Product Specifications and Wall- Mounting Instructions	123
Appendices and Index	127
Pop-up Windows, JavaScripts and Java Permissions	129
IP Addresses and Subnetting	135
Setting up Your Computer’s IP Address	143
15.0.1 Verifying Settings	158
Wireless LANs	159
Common Services	173
Legal Information	177
Customer Support	181