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.
IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring PPP-IP-NCP-MIB with a free 30-day trial of IPNetwork Monitor.
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.
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.
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
Imported Objects
From PPP-LCP-MIB
| ppp | OBJECT-IDENTITY |
From RFC-1212
| OBJECT-TYPE |
From RFC1155-SMI
| Counter |
From RFC1213-MIB
| ifIndex |
OIDs
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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