Example of uni-directional load balancing

Load balancing with
Network Prevent for Email
Servers in reflecting mode
shows an architecture that includes uni-directional load balancing and a cluster of
Network Prevent for Email
Servers operating in reflecting mode. The servers reflect messages back to the source address, which has not been virtualized by the load balancer.
Load balancing with Network Prevent for Email Servers in reflecting mode
Details about load balancing with
Network Prevent for Email
Servers in reflecting mode are as follows:
  • An MTA creates an SMTP connection to the
    Network Prevent for Email
    Server VIP.
  • The load balancer rewrites the destination address of each packet in each SMTP session as the IP address of one of the
    Network Prevent for Email
    Servers. The load balancer does not rewrite the source address.
  • The
    Network Prevent for Email
    Server creates a connection directly to the originating MTA based on the unaltered source address of the incoming packet. The same holds for 4 and 5 in the diagram.