how load balancer works ( ldirector )

                        ________
                       |        |
                       | client |
                       |________|
                   CIP=SGW=192.168.2.62 (eth0)
                           |
                            |
             __________    |
            |          |   |   (Virtual IP=192.168.2.110, eth0:110) listening on port 25 
            | director |---|
            | (suse)   |   |
             |__________|   |   Director  IP=192.168.2.24 (eth0)
                           |
                           |
          -----------------------------------
          |                                 |
           |                                 |
 Real IP=192.168.2.214(eth0)             Real IP=192.168.2.230(eth0)
(VIP=192.168.2.110, lo:0)          (VIP=192.168.2.110, lo:0)
    ______|______                     ______|______
    |            |                     |            |
   | realserver |                     | realserver |
   |____________|                     |____________|



on the LVS server 

cat  /etc/ha.d/ldirectord.cf

quiescent=yes
checktimeout=10
checkinterval=30
autoreload=yes
logfile="/var/log/ldirectord.log"

virtual=192.168.2.110:25
        real=192.168.2.214:25 gate 9
        real=192.168.2.230:25 gate 8
        service=smtp
        protocol=tcp
        scheduler=wrr