Appendix B IP Addresses and Subnetting
P-663H-51 User’s Guide
179
IP Address Conflicts
Each device on a network must have a unique IP address. Devices with duplicate IP addresses
on the same network will not be able to access the Internet or other resources. The devices may
also be unreachable through the network.
Conflicting Computer IP Addresses Example
More than one device can not use the same IP address. In the following example computer
A
has a static (or fixed) IP address that is the same as the IP address that a DHCP server assigns
to computer
B
which is a DHCP client. Neither can access the Internet. This problem can be
solved by assigning a different static IP address to computer
A
or setting computer
A
to obtain
an IP address automatically.
Figure 109
Conflicting Computer IP Addresses Example
Conflicting Router IP Addresses Example
Since a router connects different networks, it must have interfaces using different network
numbers. For example, if a router is set between a LAN and the Internet (WAN), the router’s
LAN and WAN addresses must be on different subnets. In the following example, the LAN
and WAN are on the same subnet. The LAN computers cannot access the Internet because the
router cannot route between networks.
Figure 110
Conflicting Computer IP Addresses Example
Summary of Contents for P-663H-51
Page 2: ......
Page 7: ...Safety Warnings P 663H 51 User s Guide 7 ...
Page 8: ...Safety Warnings P 663H 51 User s Guide 8 ...
Page 10: ...Contents Overview P 663H 51 User s Guide 10 ...
Page 20: ...List of Figures P 663H 51 User s Guide 20 ...
Page 23: ...23 PART I Introduction Introducing the ZyXEL Device 25 Introducing the Web Configurator 31 ...
Page 24: ...24 ...
Page 30: ...Chapter 1 Introducing the ZyXEL Device P 663H 51 User s Guide 30 ...
Page 36: ...Chapter 2 Introducing the Web Configurator P 663H 51 User s Guide 36 ...
Page 50: ...50 ...
Page 66: ...Chapter 5 WAN Setup P 663H 51 User s Guide 66 Figure 30 Advanced Setup WAN Add Summary MER ...
Page 108: ...Chapter 13 Dynamic DNS Setup P 663H 51 User s Guide 108 ...
Page 114: ...Chapter 15 Port Mapping P 663H 51 User s Guide 114 ...
Page 116: ...116 ...
Page 118: ...Chapter 16 Diagnostics P 663H 51 User s Guide 118 ...
Page 122: ...Chapter 17 Settings P 663H 51 User s Guide 122 ...
Page 126: ...Chapter 18 Logs P 663H 51 User s Guide 126 ...
Page 130: ...Chapter 19 SNMP P 663H 51 User s Guide 130 ...
Page 132: ...Chapter 20 Time P 663H 51 User s Guide 132 ...
Page 140: ...Chapter 23 Save Reboot and Logout P 663H 51 User s Guide 140 ...
Page 141: ...141 PART IV Troubleshooting and Specifications Troubleshooting 143 Product Specifications 147 ...
Page 142: ...142 ...
Page 152: ...Chapter 25 Product Specifications P 663H 51 User s Guide 152 ...
Page 154: ...154 ...
Page 188: ...Appendix D Common Services P 663H 51 User s Guide 188 ...
Page 196: ...Appendix F Legal Information P 663H 51 User s Guide 196 ...
Page 202: ...Appendix G Customer Support P 663H 51 User s Guide 202 ...