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Old 09-13-2016, 05:32 PM   #1
Registered: Aug 2008
Location: Yemen
Distribution: Fedora, CentOS, RedHat , OpenFiler, ESXI
Posts: 225

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Smile ProxSMTP - Load Ballncer.

Hi to all.

A a sys-admin that used to work with us setup Proxsmtp servers and the switch forward all the SMTP traffic to the system to check for RBL listing.

He used this method:

so in short the switches load balance the traffic to 4 servers. however it is putting a huge load on the switches.

I have tried putting LVS servers. But LVS only recognize traffic that is sent to the VIP's IP and drops everything else. where the traffic from the switches are sent are all SMTP traffic. When I add the IP to the Real server directly it works. but not as a VIP.

--- Is there a better way to do this ?
--- I think the question is Layer4 and Layer2 traffic. ?

Any input would be great.

Thanks guys
Old 09-16-2016, 09:24 PM   #2
Registered: Sep 2015
Posts: 733

Rep: Reputation: Disabled
You mention multiple things but a system to check for RBL usually is a properly configured DNS server and
one DNS server can handle a lot of requests so I don't think a load balancer is needed for RBL.


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