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lizhuh_55036's avatar
lizhuh_55036
Icon for Nimbostratus rankNimbostratus
Jun 05, 2009

snat pool of a virtual server

Can someone with experience help me out here?

 

 

After a snat pool of ex_ip1, ex_ip2, ex_ip3 is assigned to a virtual server. Then response to clients will go through BigIP.

 

 

For the out going packets from bigip, the destination addresses are the ex_ip1, ex_ip2, ex_ip3, how will the out going packets reach the actual client? Does another conversion happen on load balancer? which convert the ex_ip1, ex_ip2, ex_ip3 to the original client ip?

 

 

Linda
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  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Jun 15, 2009
    Hi Linda,

    LTM will "un-translate" the address translation for responses back to the client so the source IP will be the virtual server IP address. 

     
 client: 1.1.1.1 
 VIP: 2.2.2.2 
 SNAT: 3.3.3.3 
 server: 4.4.4.4 
                    Source       |     Destination 
                    ------------------------------------- 
 Client -> VIP      1.1.1.1      |     2.2.2.2 
 LTM -> server      3.3.3.3      |     4.4.4.4 
 server -> LTM      4.4.4.4      |     3.3.3.3 
 VIP -> client      2.2.2.2      |     1.1.1.1

    Aaron