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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 graceful...
application delivery
monitor
performance
smtp
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).