Forum Discussion

Tinnitus's avatar
Tinnitus
Icon for Nimbostratus rankNimbostratus
Dec 04, 2013

Difference between TCP monitor and SMTP monitor

Hi.

 

Will anyone be able to explain to me the difference between the normal TCP monitor (Alias port 25) and a SMTP type monitor? For both type of monitor: 1. Will F5 close the connection gracefully (send a reset packet) or does it let the connection timeout/expire ?

 

What exactly does the SMTP type monitor do? Does it sends a HELO to the email server?

 

application delivery
monitor
performance
smtp
  • Emad's avatar
    Emad
    Icon for Cirrostratus rankCirrostratus
    Dec 04, 2013

    SMTP default monitor in LTM only check that mail server is up and responding to commands. it marks mail server up if it responds to commands SMTP HELO and Quit.

     

    you can for detail settings you can refer to

     

    http://support.f5.com/content/kb/en-us/products/big-ip_ltm/manuals/product/ltm-monitors-reference-11-1-0/_jcr_content/pdfAttach/download/file.res/BIG-IP_Local_Traffic_Manager__Monitors_Reference.pdf

     

  • Gregory_Thiell's avatar
    Gregory_Thiell
    Icon for Employee rankEmployee
    Jul 12, 2015

    This is an example of the communication you'll see between the F5 acting as a client (C) and the SMTP server (S) if you capture the traffic of the SMTP monitor (and your SMTP server is responding). In that case, test.my-domain.com is the domain specified in the SMTP monitor.

    S: 220 your.mail.server.com ESMTP Postfix
C: helo test.my-domain.com
S: 250 your.mail.server.com
C: quit
S: 221 2.0.0 Bye

    You'll also see the F5 establishing the TCP connection, and properly closing it (TCP handshakes).

  • Rikgopal's avatar
    Rikgopal
    Icon for Nimbostratus rankNimbostratus
    Jul 13, 2019

    Hi,

     

    Can anyone help with all the parameters that need to be configured on the monitor..