All MIBs › PPP-IP-NCP-MIB
Category: Network Interfaces
Description:
Defines managed objects for the PPP IP Network Control Protocol, providing IP-layer information and configuration for each PPP link.
Imported Objects
From PPP-LCP-MIB
| ppp | OBJECT-IDENTITY |
From RFC-1212
| OBJECT-TYPE |
From RFC1155-SMI
| Counter |
From RFC1213-MIB
| ifIndex |
What Is PPP-IP-NCP-MIB?
PPP-IP-NCP-MIB is a vendor-neutral IETF standards-based MIB defining managed objects for the IP Network Control Protocol (IPCP) layer of Point-to-Point Protocol (PPP) links. It exposes a table of per-link IP-layer operational status and a configuration table covering administrative status and compression settings for each PPP link. Its monitoring focus is on PPP link software/protocol status rather than hardware: pppIpOperStatus reveals whether IPCP has successfully negotiated and is passing IP traffic over a given PPP link, and the compression protocol objects reveal whether Van Jacobson-style header compression is active and its negotiated slot parameters. It naturally depends on and complements the base PPP MIBs (such as the PPP link control and PPP security MIBs) since IPCP only comes up after PPP link establishment. Per the PPP-IP-NCP-MIB RFC, it is typically deployed on routers and remote access servers using PPP encapsulation (e.g., over serial, ISDN, or DSL links) to monitor the IP-layer state of each PPP connection.
IPNetwork Monitor allows you to monitor SNMP objects defined in PPP-IP-NCP-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.
What Can Be Monitored
- PPP link IP-layer operational status
- compression protocol (local-to-remote and remote-to-local)
- max slot IDs for compression
- link administrative status/configuration
Supported Devices
- vendor-neutral, standards-based MIB, not tied to a specific manufacturer; applies to routers and remote access servers using PPP links
Monitoring Examples
An operator would poll pppIpTable/pppIpEntry's pppIpOperStatus to confirm IPCP has reached the "up" state on a given PPP link, and check pppIpLocalToRemoteCompressionProtocol and pppIpRemoteToLocalCompressionProtocol along with pppIpRemoteMaxSlotId/pppIpLocalMaxSlotId to verify header compression negotiation matches expectations. The pppIpConfigTable/pppIpConfigEntry with pppIpConfigAdminStatus and pppIpConfigCompression let an administrator confirm the link was configured correctly before troubleshooting. A pppIpOperStatus stuck in a down or negotiating state while the underlying PPP link is up would reveal an IPCP negotiation failure, often due to mismatched compression or address negotiation options.
OIDs
| OID symbolic | OID numeric | Type | Access | Description |
|---|---|---|---|---|
| pppIp | 1.3.6.1.2.1.10.23.3 | |||
| pppIpTable | 1.3.6.1.2.1.10.23.3.1 | not-accessible | Table containing the IP parameters and statistics for the local PPP entity. | |
| pppIpEntry | 1.3.6.1.2.1.10.23.3.1.1 | not-accessible | IPCP status information for a particular PPP link. | |
| INT pppIpOperStatus | 1.3.6.1.2.1.10.23.3.1.1.1 | INTEGER | read-only | The operational status of the IP network protocol. If the value of this object is up then the finite state machine for the IP network protocol has reached the Opened state. |
| INT pppIpLocalToRemoteCompressionProtocol | 1.3.6.1.2.1.10.23.3.1.1.2 | INTEGER | read-only | The IP compression protocol that the local PPP-IP entity uses when sending packets to the remote PPP-IP entity. The value of this object is meaningful only when the link has reached the open state (pppIpOperStatus is opened). |
| INT pppIpRemoteToLocalCompressionProtocol | 1.3.6.1.2.1.10.23.3.1.1.3 | INTEGER | read-only | The IP compression protocol that the remote PPP-IP entity uses when sending packets to the local PPP-IP entity. The value of this object is meaningful only when the link has reached the open state (pppIpOperStatus is opened). |
| INT pppIpRemoteMaxSlotId | 1.3.6.1.2.1.10.23.3.1.1.4 | INTEGER | read-only | The Max-Slot-Id parameter that the remote node has advertised and that is in use on the link. If vj-tcp header compression is not in use on the link then the value of this object shall be 0. The value of this object is meaningful only when the link has reached the open state (pppIpOperStatus is opened). |
| INT pppIpLocalMaxSlotId | 1.3.6.1.2.1.10.23.3.1.1.5 | INTEGER | read-only | The Max-Slot-Id parameter that the local node has advertised and that is in use on the link. If vj-tcp header compression is not in use on the link then the value of this object shall be 0. The value of this object is meaningful only when the link has reached the open state (pppIpOperStatus is opened). |
| pppIpConfigTable | 1.3.6.1.2.1.10.23.3.2 | not-accessible | Table containing configuration variables for the IPCP for the local PPP entity. | |
| pppIpConfigEntry | 1.3.6.1.2.1.10.23.3.2.1 | not-accessible | IPCP information for a particular PPP link. | |
| INT pppIpConfigAdminStatus | 1.3.6.1.2.1.10.23.3.2.1.1 | INTEGER | read-write | The immediate desired status of the IP network protocol. Setting this object to open will inject an administrative open event into the IP network protocol's finite state machine. Setting this object to close will inject an administrative close event into the IP network protocol's finite state machine. |
| INT pppIpConfigCompression | 1.3.6.1.2.1.10.23.3.2.1.2 | INTEGER | read-write | If none(1) then the local node will not attempt to negotiate any IP Compression option. Otherwise, the local node will attempt to negotiate compression mode indicated by the enumerated value. Changing this object will have effect when the link is next restarted. |
RFC description
Defines managed objects for the IP Network Control Protocol (IPCP) of the Point-to-Point Protocol (PPP), covering configuration, status, and control variables for IP over PPP links, as standardized in RFC 1473.
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