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Forum Discussion

Ray_Sbrusch_941's avatar
Ray_Sbrusch_941
Icon for Nimbostratus rankNimbostratus
Oct 28, 2009

Preserving Client IP address for SMTP traffic

I know this topic has been discussed in the forums multiple times, but I never found implementation details which dont' require iRules or putting the BigIP in bridging mode.     I would li...
config
design
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Oct 28, 2009
It sounds like you have the configuration set up correctly to not do source address translation on LTM. Does it work if a real client tries to connect to the SMTP servers via the VIP?

 

 

I'd guess the SMTP server is closing the connection before you have a chance to send any data. You can get around this issue by using netcat from the LTM command line:

 

 

echo "my smtp commands" | nc VIP_IP VIP_PORT

 

 

Also, clients on the same subnet as the SMTP servers would not work as the SMTP servers would respond back directly to the clients--not to LTM.

 

 

Aaron