Bandwidth monitoring on XG-7100

  • Please bare with me as I'm easily lost when it comes to SNMP monitoring.

    Using Solarwinds/GFI bandwidth monitoring tool on many pfSense boxes with no issues. However the XG-7100 is a problem.

    Trying to monitor bandwidth on one of my WAN interfaces. However, the WAN interface is a VLAN off of the lagg0 interface from the onboard switch.

    Solarwinds interface allows me to plug in the port to monitor, however I don't know which port to monitor. Only ports 1, 2, and 3 are returning results, but neither appear to be my WAN interface.

    Any help in discovering the correct way of monitoring on this particular unit would be helpful. Thank you!

  • Rebel Alliance Developer Netgate

    Are you using the built-in bsnmpd daemon or the NET-SNMP package?

    The OS and thus SNMP should be exposing each VLAN as a separate interface, but it's possible that bsnmpd is doing something odd there.

  • I'm using the built in bsnmpd daemon. It's possible it is, but I'm unsure of how to determine which interface is corresponding to which interface. I tried plugging in #s 0-5 but stopped there. 0, 4, and 5 all returned failures.

  • Rebel Alliance Developer Netgate

    With SNMP it should able to tell you which is which based on the interface name, such as laggX.Y. It should be able to look that up in the interface index table rather than making you pick that out of a list like that.

    For example:

    $ snmpwalk -M +/usr/share/snmp/mibs/ -v2c -c public udp: ifDescr
    IF-MIB::ifDescr.1 = STRING: vmx0
    IF-MIB::ifDescr.2 = STRING: vmx1
    IF-MIB::ifDescr.3 = STRING: vmx2
    IF-MIB::ifDescr.4 = STRING: enc0
    IF-MIB::ifDescr.5 = STRING: lo0
    IF-MIB::ifDescr.6 = STRING: pflog0
    IF-MIB::ifDescr.7 = STRING: pfsync0
    IF-MIB::ifDescr.8 = STRING: ipsec4000
    IF-MIB::ifDescr.9 = STRING: bridge0
    IF-MIB::ifDescr.10 = STRING: ovpns3
    IF-MIB::ifDescr.11 = STRING: ovpns4
    IF-MIB::ifDescr.12 = STRING: ovpns5
    IF-MIB::ifDescr.13 = STRING: ovpns6
    IF-MIB::ifDescr.14 = STRING: ovpns2
    IF-MIB::ifDescr.15 = STRING: ovpns7
    IF-MIB::ifDescr.16 = STRING: ovpns8
    IF-MIB::ifDescr.17 = STRING: ovpnc1
    IF-MIB::ifDescr.18 = STRING: ng0
    IF-MIB::ifDescr.19 = STRING: ng1
    IF-MIB::ifDescr.20 = STRING: ng2

  • Rebel Alliance Developer Netgate

    A better example, from my 7100:

    $ snmpwalk -M +/usr/share/snmp/mibs/ -v2c -c public udp: ifDescr
    IF-MIB::ifDescr.1 = STRING: ix0
    IF-MIB::ifDescr.2 = STRING: ix1
    IF-MIB::ifDescr.3 = STRING: ix2
    IF-MIB::ifDescr.4 = STRING: e6000sw0port1
    IF-MIB::ifDescr.5 = STRING: e6000sw0port2
    IF-MIB::ifDescr.6 = STRING: e6000sw0port3
    IF-MIB::ifDescr.7 = STRING: e6000sw0port4
    IF-MIB::ifDescr.8 = STRING: e6000sw0port5
    IF-MIB::ifDescr.9 = STRING: e6000sw0port6
    IF-MIB::ifDescr.10 = STRING: e6000sw0port7
    IF-MIB::ifDescr.11 = STRING: e6000sw0port8
    IF-MIB::ifDescr.12 = STRING: e6000sw0port9
    IF-MIB::ifDescr.13 = STRING: e6000sw0port10
    IF-MIB::ifDescr.14 = STRING: ix3
    IF-MIB::ifDescr.15 = STRING: enc0
    IF-MIB::ifDescr.16 = STRING: lo0
    IF-MIB::ifDescr.17 = STRING: pflog0
    IF-MIB::ifDescr.18 = STRING: pfsync0
    IF-MIB::ifDescr.19 = STRING: lagg0
    IF-MIB::ifDescr.20 = STRING: lagg0.4090
    IF-MIB::ifDescr.21 = STRING: lagg0.4091

  • Unfortunately my Solarwinds tool does not do any type of lookup.

    I'm completely green when it comes to SNMP, so the extent of my knowledge stops at knowing that if I match the correct port in the below tool, it will return clean data on Rx and Tx for that interface. The behind the scenes stuff, I'm not so sure.


    I'll try using your example shot from your 7100 to guess the correct value, starting with 20.

  • I'm pretty sure we nailed it with 20, as it looks like it matches your set up. I'm getting what appear to be accurate results in comparison to the real-time traffic monitor. Thank goodness I asked in this post, because I likely would not have tried every integer up to 20!

  • Rebel Alliance Developer Netgate

    If you install the net-snmp package you can run that same snmpwalk command above straight from pfSense in the shell. You don't have to use the package, just have it installed so you can have those commands. Substitute in your IP address and community name in the command. Then you can confirm what the index numbers are.

    You can also use ifIndex instead of ifDescr to ensure the numbers line up.

  • That's great. Thanks for all your (speedy) help!

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