ZyXEL P-660HN-T1A Support Guide - Page 78

protocolRFC-868, NTP protocolRFC-1305, Maintenance -> System -> Time Setting., Using IP

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P-660HN Series Support Notes protocol(RFC-868), and NTP protocol(RFC-1305). You have to assign an IP address of a time server and then, the P-660HN-T1A will get the date, time, and time-zone information from this server. You can configure it in Web Configurator, Advanced Setup, Maintenance -> System -> Time Setting. 13. Using IP Multicast  What is IP Multicast ? Traditionally, IP packets are transmitted in two ways - unicast or broadcast. Multicast is a third way to deliver IP packets to a group of hosts. Host groups are identified by class D IP addresses, i.e., those with "1110" as their higher-order bits. In dotted decimal notation, host group addresses range from 224.0.0.0 to 239.255.255.255. Among them, 224.0.0.1 is assigned to the permanent IP hosts group, and 224.0.0.2 is assigned to the multicast routers group. IGMP (Internet Group Management Protocol) is the protocol used to support multicast groups. The latest version is version 2 (see RFC2236). IP hosts use IGMP to report their multicast group membership to any immediate-neighbor multicast routers so the multicast routers can decide if a multicast packet needs to be forwarded. At start up, the P-660HN-T1A queries all directly connected networks to gather group membership. After that, the P-660HN-T1A updates the information by periodic queries. The P-660HN-T1A implementation of IGMP is also compatible with version 1. The multicast setting can be turned on or off on Ethernet and remote nodes. 78 All contents copyright © 2010 ZyXEL Communications Corporation.

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P-660HN Series Support Notes
78
All contents copyright © 2010 ZyXEL Communications Corporation.
protocol(RFC-868)
, and
NTP protocol(RFC-1305)
. You have to assign an IP
address of a time server and then, the P-660HN-T1A will get the date, time,
and time-zone information from this server. You can configure it in Web
Configurator, Advanced Setup,
Maintenance -> System -> Time Setting.
13. Using IP Multicast
What is IP Multicast ?
Traditionally, IP packets are transmitted in two ways - unicast or broadcast.
Multicast is a third way to deliver IP packets to a group of hosts. Host groups
are identified by class D IP addresses, i.e., those with "1110" as their
higher-order bits. In dotted decimal notation, host group addresses range from
224.0.0.0 to 239.255.255.255. Among them, 224.0.0.1 is assigned to the
permanent IP hosts group, and 224.0.0.2 is assigned to the multicast routers
group.
IGMP (Internet Group Management Protocol) is the protocol used to support
multicast groups. The latest version is version 2 (see RFC2236). IP hosts use
IGMP to report their multicast group membership to any immediate-neighbor
multicast routers so the multicast routers can decide if a multicast packet
needs to be forwarded. At start up, the P-660HN-T1A queries all directly
connected networks to gather group membership.
After that, the P-660HN-T1A updates the information by periodic queries. The
P-660HN-T1A implementation of IGMP is also compatible with version 1. The
multicast setting can be turned on or off on Ethernet and remote nodes.