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Steve_Carroll_1's avatar
Steve_Carroll_1
Icon for Nimbostratus rankNimbostratus
Dec 04, 2014

Why is my F5 dropping telnet on port 25 for one network?

I have configured SMTP on my LTM (11.4.1) and have configured a SNAT of 10.229.104.37 so all connections from the LTM are sent with this address and I have no iRule configured.   If telnet 10.229....
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Steve_Carroll_1's avatar
Steve_Carroll_1
Icon for Nimbostratus rankNimbostratus
Dec 05, 2014

What Lies Beneath thanks for your reply.

 

The F5 only has one external connection on the 10.229.103.0 network and it's the default route for outbound traffic for both the failing subnet and also working connections from 10.229.0.0 devices.

 

The routing has been checked from the load balancer through a router\switch and two firewalls back towards the failing network.

 

As for the SMTP server that only gets connections from the F5 SNAT address which is the same for all client requests.