why realserver need public ip?

["凤翼天翔" <kingnetwork@xxxxxxx>]

lvs-users，您好！

first of all, thanks for your answer, below table is LVS-DR work flow, why 
realserver need public ip? at last step, realserver use local routing table and 
find VIP, it generates reply use VIP, if realserver reply client use VIP, i 
think it not use own public ip, why it need public ip? 

        packet                  source        dest         data

1. request from client  CIP:3456      VIP:23       -
2. ipvsadm table:
   director chooses server=RIP1, creates link-layer packet
                        MAC of DIP    MAC of RIP1  IP datagram
                                                   source=CIP:3456,
                                                   dest=VIP:23,
                                                   data= -
3. realserver recovers IP datagram
                        CIP:3456      VIP:23       -
4. realserver looks up routing table, finds VIP is local,
   processes request locally, generates reply
                        VIP:23        CIP:3456     "login:"

5. packet leaves realserver via its default gw, not via DIP.

 


　　　　　　　　致
礼！
                                

　　　　　　　　凤翼天翔
　　　　　　　　kingnetwork@xxxxxxx
　　　　　　　　　　2005-11-29