Forum Discussion

Bartek's avatar
Bartek
Icon for Cirrus rankCirrus
Apr 17, 2020

Source IP for SNMP traps

Hi Guys,

I can't find it anywhere - what is the source IP for SNMP traps when you configure the network to "Default"? I'm having a HA setup of two 12.1.5 devices.

application delivery
BIG-IP
snmp
  • Mayur_Sutare's avatar
    Mayur_Sutare
    Icon for MVP rankMVP
    Apr 18, 2020

    Hello,

     

    What do you see under " show running-config sys snmp trap-source"

     

    F5 can use different outgoing interfaces to send snmp traps. You can even modify and configure source interface as per your requirement for snmp traps. Please refer below article.

     

    https://support.f5.com/csp/article/K91608713

     

    Hope it helps!

    Mayur

  • Samir's avatar
    Samir
    Icon for MVP rankMVP
    Apr 18, 2020

    Did you try tcpdump to check source ip?

    ​

    tcpdump -i any -nn port snmp

    ​

    ​hope it will work for you..

  • Bartek's avatar
    Bartek
    Icon for Cirrus rankCirrus
    Apr 20, 2020

    The source is set to "default" in trap configuration - can't really find a definition of "default".

    Tcpdump was one of my first ideas, however hard to track the source when traps are not firing that often.

  • Mayur_Sutare's avatar
    Mayur_Sutare
    Icon for MVP rankMVP
    Apr 20, 2020

     ,

     

    Do you have any specific host route for SNMP server or is it using default route to reach it from F5? I think, unless SNMP server is a connected network, it would use the interface to go to server where the default route is pointed.

     

    Mayur