Monitor L2TP Users with RADIUS Auth

Question

Hello Community, 
 I have set up a L2TP VPN with RADIUS authentication on a Sophos UTM. This all works. Now I want to monitor the number of users. The problem is, on the Sophos UTM no object is created for the user when RADIUS. The 'Remote Users' and 'Online Users' sections will remain empty. I am looking for a way to script the number of users to display them in PRTG (RestAPI or 'cc'). 
 Thanks, 
 Ben

Ben@Network · Answer

I tested a little bit and I think when I count the number of pppd-processes via SNMP I get the amount of connected L2TP users. Here is a powershell sniplet: 
 # github.com/.../SNMPv3 # Install-Module -Name SNMPv3 $process = "pppd" $ipHost = '192.168.0.1' $WalkRequest = @{ UserName = 'snmpuser' Target = $ipHost OID = '1.3.6.1.4.1.15601.4.2.1.2' AuthType = 'SHA1' AuthSecret = 'AuthSecret' PrivType = 'AES128' PrivSecret = 'PrivSecret' Context = '' Timeout = 5000 } $count = 0 foreach ($proc in Invoke-SNMPv3Walk @WalkRequest) { if ([string]$proc.value -eq $process) {$count++} } Write-Host $count 
 Thanks, Ben