P-661H/HW Series User’s Guide
Chapter 5 LAN Setup
99
5.2.3 Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1
recipient) or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to
a group of hosts on the network - not everybody and not just 1.
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish
membership in a Multicast group - it is not used to carry user data. IGMP version 2 (RFC
2236) is an improvement over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If
you would like to read more detailed information about interoperability between IGMP
version 2 and version 1, please see sections 4 and 5 of RFC 2236. The class D IP address is
used to identify host groups and can be in the range 224.0.0.0 to 239.255.255.255. The address
224.0.0.0 is not assigned to any group and is used by IP multicast computers. The address
224.0.0.1 is used for query messages and is assigned to the permanent group of all IP hosts
(including gateways). All hosts must join the 224.0.0.1 group in order to participate in IGMP.
The address 224.0.0.2 is assigned to the multicast routers group.
The ZyXEL Device supports both IGMP version 1 (
IGMP-v1
) and IGMP version 2 (
IGMP-
v2
). At start up, the ZyXEL Device queries all directly connected networks to gather group
membership. After that, the ZyXEL Device periodically updates this information. IP
multicasting can be enabled/disabled on the ZyXEL Device LAN and/or WAN interfaces in
the web configurator (
LAN
;
WAN
). Select
None
to disable IP multicasting on these
interfaces.
5.2.4 Any IP
Traditionally, you must set the IP addresses and the subnet masks of a computer and the
ZyXEL Device to be in the same subnet to allow the computer to access the Internet (through
the ZyXEL Device). In cases where your computer is required to use a static IP address in
another network, you may need to manually configure the network settings of the computer
every time you want to access the Internet via the ZyXEL Device.
With the Any IP feature and NAT enabled, the ZyXEL Device allows a computer to access the
Internet without changing the network settings (such as IP address and subnet mask) of the
computer, when the IP addresses of the computer and the ZyXEL Device are not in the same
subnet. Whether a computer is set to use a dynamic or static (fixed) IP address, you can simply
connect the computer to the ZyXEL Device and access the Internet.
The following figure depicts a scenario where a computer is set to use a static private IP
address in the corporate environment. In a residential house where a ZyXEL Device is
installed, you can still use the computer to access the Internet without changing the network
settings, even when the IP addresses of the computer and the ZyXEL Device are not in the
same subnet.
Summary of Contents for P-661H Series
Page 2: ......
Page 5: ...P 661H HW Series User s Guide Certifications 5...
Page 10: ...P 661H HW Series User s Guide 10 Customer Support...
Page 44: ...P 661H HW Series User s Guide 44 Chapter 1 Getting To Know Your ZyXEL Device...
Page 76: ...P 661H HW Series User s Guide 76 Chapter 3 Wizards...
Page 108: ...P 661H HW Series User s Guide 108 Chapter 5 LAN Setup...
Page 132: ...P 661H HW Series User s Guide 132 Chapter 6 Wireless LAN...
Page 192: ...P 661H HW Series User s Guide 192 Chapter 10 Trend Micro Security Services...
Page 196: ...P 661H HW Series User s Guide 196 Chapter 11 Content Filtering...
Page 202: ...P 661H HW Series User s Guide 202 Chapter 12 Introduction to IPSec...
Page 230: ...P 661H HW Series User s Guide 230 Chapter 13 VPN Screens...
Page 234: ...P 661H HW Series User s Guide 234 Chapter 14 Static Route...
Page 246: ...P 661H HW Series User s Guide 246 Chapter 15 Bandwidth Management...
Page 250: ...P 661H HW Series User s Guide 250 Chapter 16 Dynamic DNS Setup...
Page 280: ...P 661H HW Series User s Guide 280 Chapter 19 System...
Page 290: ...P 661H HW Series User s Guide 290 Chapter 21 Tools...
Page 296: ...P 661H HW Series User s Guide 296 Chapter 23 Troubleshooting...
Page 300: ...P 661H HW Series User s Guide 300 Appendix A...
Page 304: ...P 661H HW Series User s Guide 304 Appendix C...
Page 326: ...P 661H HW Series User s Guide 326 Appendix E...
Page 328: ...P 661H HW Series User s Guide 328 Appendix F...
Page 334: ...P 661H HW Series User s Guide 334 Appendix G...
Page 368: ...P 661H HW Series User s Guide 368 Appendix K...
Page 376: ...P 661H HW Series User s Guide 376 Figure 219 Java Sun...