Lecture 23: Network Management #3

The IP MIB Group

Most of the interesting network managment information relates to the IP subsystem. Some IP scalar objects are as follows:

ipForwarding: If this BOOLEAN variable is TRUE, this node is acting as an IP gateway (router). Otherwise it is a host.
ipDefaultTTL: Default TTL for datagrams originating from this node -- typically 60.
ipInReceives: Total number of datagrams received from the underlying MAC (usually Ethernet) layer by the IP subsystem.
ipForwDatagrams: Total number of datagrams forwarded (ie, routed) by this router.
ipInDiscards: Total number of datagrams discarded (ie, dropped) due to resource limitations
...plus many more

There are also several tables associated with the IP subsystem:

ipAddrTable: maintains information about each of the IP addresses on a node: netmask, broadcast, etc
ipRoutingTable: keeps track of routes associated with the node. Each route is an ipRouteEntry type.
IP Address translation table: (in MIB-II) contains entries for MAC-to-IP mapping address mapping for each interface.

Lecture 23: Network Management #3