WEBSHARE 242W

Traps supported: Cold Start, Authentication Failure.

The following MIBs are supported:

•RFC 1213 (MIB-II):System group Interfaces group Address Translation group IP group

ICMP group TCP group UDP group

EGP (not applicable) Transmission SNMP group

•RFC1650 (EtherLike-MIB):dot3Stats

•RFC 1493 (Bridge MIB):

dot1dBase group dot1dTp group

dot1dStp group (if configured as spanning tree)

•RFC 1471 (PPP/LCP MIB):

pppLink group pppLqr group

•RFC 1472 (PPP/Security MIB):

PPPSecurity Group)

•RFC 1473 (PPP/IP MIB):

PPPIP Group

•RFC 1474 (PPP/Bridge MIB):

PPPBridge Group

•RFC1573 (IfMIB):

ifMIBObjects Group

•RFC1695 (atmMIB): atmMIBObjects

•RFC 1907 (SNMPv2):

only snmpSetSerialNo OID

3.6.3.7.5 IGMP

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

224.0.0.0is not assigned to any group and is used by IP multicast computers. The address

224.0.0.1is 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.

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