Some way to add and modify multiple OID's...

[NoID]

Ok, this is what I need to do. A device I am monitoring creates an OID everytime a user has a VPN connection to it.

for example...
OID Value
.1.3.......1.1.1 0
.1.3.......1.1.2 1
.1.3.......1.1.3 2
.1.3.......1.1.4 3
etc.

What I would like to do is find a way to poll a bunch of OIDs and plot the great returned value +1 (thus showing a user count). Where do I start?

[TheWitness]

Does the MIB currently include an OID of the number of children similar to the ifMib? If so, that's your answer. Otherwise, a simple php script server script to walk the tree and return the number of rows is what I see as your answer.

TheWitness

[NoID]

Hey, this stuff sure is confusing. First off, I am running Cacti on a W2k3 server. Secondly here is what happens when a user connects via VPN.

If there are currently 0 users connected than the MIB tree terminates at:
.1.3.6.1.4.1.12356.9.1.1

When the first user connects, the following OID is available:
.1.3.6.1.4.1.12356.9.1.1.1.1 returns 0

When the second user connects, the following OIDs are available:
.1.3.6.1.4.1.12356.9.1.1.1.1 returns 0
.1.3.6.1.4.1.12356.9.1.1.1.2 returns 1

When the third user connects, the following OIDs are available:
.1.3.6.1.4.1.12356.9.1.1.1.1 returns 0
.1.3.6.1.4.1.12356.9.1.1.1.2 returns 1
.1.3.6.1.4.1.12356.9.1.1.1.3 returns 2

Let's say the second user disconnects. Then the following OIDs are available:
.1.3.6.1.4.1.12356.9.1.1.1.1 returns 0
.1.3.6.1.4.1.12356.9.1.1.1.3 returns 2

I guess what I am looking for is a script that can check 20 OIDs. If the OID is valid then return a "1" for that OID. Do that for each OID I list, and then sum up the "1"s that should yield a current VPN user count. The device is a Fortinet F60 and I wish there was an OID that did this automatically, but I have walked the whole treee and found nothing.

Simply put, I have no idea how to script for cacti. So any help, be it a really good tutorial, the finished script, a skeleton script, anything, would be greatly appreciated. Thanks in advance!!!

[TheWitness]

How many of these devices do you intend on graphing?

TheWitness

[NoID]

Right now there is only one. In the future, I don;t see me adding anymore VPN endpoints to my network. So, to answer your questions.... 1.

[TheWitness]

This one is easy in a php script server. YOu will walk the entire mib using cacti_snmp_walk and then count the total rows using the "sizeof" command and that will be the number of connected users. You don't need to go anywhere otherthan there.

TheWitness

[NoID]

How do I do that?

[NoID]

Is there a good sample script that I can work with to attempt this?

[TheWitness]

The ss_host_cpu.php is a good one. Focus on the Index portion. The sizeof parameter is the number of connections. However, you are not running a query but rather a script server script similar to ss_sql.php

TheWitness

[NoID]

Alright, I'll disect it this week. Thanks!