We need to be careful when setting up SNMP queries. Others will deal with the connected links: bandwidth usage, link errors and status, queue overflows, &c.
Some of these metrics will be central to device operation: CPU use, free memory, uptime, &c.
This allows the station to compile trend data for key device metrics. SNMP information is usually polled from the monitoring station at five-minute intervals. These respectively added some bulk information retrieval functionality and improved privacy and security.
Most equipment and software vendors have embraced and extended this body to varying degrees of consistency.įurther revisions (SNMPv2c, SNMPv2u and SNMPv3) came along in the 19d early 2000s. It began with a simple method for accessing a standard body of information called a Management Information Base or MIB. SNMP, the Simple Network Management Protocol has been at the core of query-based network monitoring since the early 1990s. We'll start with pull methods, where the network monitoring station and agents query devices for relevant information. Let's have a look at the tools available to us. Our monitoring strategy should use the right means to get the information we need with the least impact to the network's performance. In others, the devices themselves report information to the station and agents. In some cases, the monitoring station and its agents collect data from devices. You elect to use third-party content at your own risk, and you will be solely responsible for the incorporation of the same if any.A network monitor uses many mechanisms to get data about the status of its devices and interconnected links. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. To get the path of the VPN tunnel, you'd want to setup a source where you have your VPN termination device and set the destination as, for example, port 10000 on the destination VPN termination device.ĭisclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. Performance metrics and thresholding works, but the VPN tunnel counts as a single connection. Q: How is NetPath visibility across VPN tunnels?Ī: For transit traffic, VPN tunnels hide layer 3 hops so NetPath shows the entire tunnel as a single hop.
Q: The CPU processor check during the install requirements check, does it count how many CPUs the server has or only look at the speed of the processor?Ī:The CPU processor check does count the number of cores available. See the NPM 12.0 Administrator Guide for further information on NetPath. Q: What are the NPM 12 system requirements & NetPath port requirements?Ī: See the NPM 12.0 requirements article for details. More information available in the Scalability section of the Admin Guide for NetPath. In terms of load, a rough order of magnitude example is that a probe monitoring 9 paths takes about 75% of one CPU core.
Each poller can handle up to 100 paths, and each Orion instance can handle up to 1000 paths. Q: How many paths can a probe handle, and how many paths can I have in one Orion installation?Ī: Each probe can handle 10 to 30 paths. It discovers more, and often works when Traceroute doesn't.
Q: Can you install the NetPath probe (agent) on Linux ® servers?Ī: No, NetPath probes are only supported on Windows today.Ī: No, NetPath crafts custom TCP packets to probe and discover the path. Q: Is NetPath ® a feature of NPM or does it require a license?Ī: NetPath is a feature of NPM, no additional cost for customers who already own NPM. The new, advanced monitoring for stacking technology introduced in NPM 12 is specific to Cisco ® SwitchStacks ® . Q: Does NPM support all switched stacks or just Cisco?Ī: Virtually all switch stacks have been supported by NPM for quite some time.