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Forum Discussion

Josh_41258's avatar
Josh_41258
Icon for Nimbostratus rankNimbostratus
Jan 09, 2009

Basic SMTP Virtual Server

I am trying to configure a basic virtual server to load balance a few SMTP servers. I created a new virtual server listening on TCP/25, no profiles, no OneConnect, AutoSnat, and other default setting...
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James_Quinby_46's avatar
James_Quinby_46
Historic F5 Account
Jan 09, 2009
This smells a bit like a routing issue of some sort, though I'd start with the usual suspects:

 

 

1. Can the LTM see the SMTP servers? What happens if you log into the LTM and telnet to port 25 on the SMTP servers?

 

2. Do the SMTP servers show as 'up' in their pool? If you're using a monitor, is it correctly (or incorrectly) marking them up or down as appropriate?

 

3. What does a tcpdump show when a connection is made on the VIP/external side? and the internal side?

 

4. Anything oddball in the logs on your SMTP server or in /var/log/ltm on the LTM?

 

 

One or more of these should get you on the right track.

 

 

The 'smtp' profile comes into use if you're running ASM or ASM - it's used to hook the security features of those 2 products, and is otherwise not needed. It works the same way as an HTTP class profile does, except for SMTP.