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jmanya_44531's avatar
jmanya_44531
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Sep 24, 2014

SNAT from one to nine IPs

Hello folks,

 

The main goal is to load balance outbound email traffic and to SNAT such connections using a pool of public IPs. I just configured a SNAT in order to translate one private IP of my mail server to a SNAT pool composed of nine public IPs. Those nine public IPs belongs to three ISPs, so I have three IPs on each ISP, total nine. The matter is that the private IP is not translated to the whole nine IPs in a round robin (I guess) way. The LTM just chooses the first three IPs(one for each ISP) and perform translation. What about the other six IPs? Do I need something additional to configure? I have tested with lot of emails, but they are leaving my network with the same three IPs and no more.

 

Thanks.

 

George

 

application delivery
design
LTM
management

2 Replies

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  • Thomas_Gobet's avatar
    Thomas_Gobet
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    Sep 24, 2014

    Hi George,

     

    SNAT pool should work as expected as it uses least connection algorithm.

     

    Can you try to define only the 3 IPs of one ISP?

     

    Or if it's not, can you "delete" the first IP to test if others work ?

     

  • jmanya_44531's avatar
    jmanya_44531
    Icon for Nimbostratus rankNimbostratus
    Sep 24, 2014

    Hello Thomas, thanks for responding,

     

    Yes, I have tested in such way. I deleted some IPs and the SNAT worked with the ones which remained in the pool. But, it was the same because the BIG IP only takes three IPs and perform SNAT with those for ever, no matter if I add the other IPs again. I understand the least connections algorithm, but the LTM statistics do not show any match with the other IPs. If the least connections is working, there must be a historic report of connections for the whole IPs.

     

    Thanks in advance

     

    George