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LillyM_9417's avatar
LillyM_9417
Icon for Altostratus rankAltostratus
Apr 27, 2011

avoid changing source port of the connection while using SNAT

Hello,

 

 

We are using SNAT in the irule. Lets assume client's Ip address 192.1.1.1 and port 9999, after the SNAT operations

 

we manage to change the clients IP address to spesific ip address format which is Okay and works fine. But although we do not do any change in the SNAT statement in the irule about the source port ( client's port), its also changed randomly. Is there any way to preserve source port same? We do not want to change the source port we want it to remain same.

 

 

Any help will be greatful.

 

 

Thanks a lot in advance.

 

 

Lilly

 

config
design

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    May 02, 2011
    By default, LTM should not change the source port of client requests unless the source port is already in use on the serverside to the same destination IP. CMP can also affect the source port selection.

     

     

    If this is failing for you constantly, I'd open a case with F5 Support. They'll be able to help you capture tcpdumps and review your configuration.

     

     

    Aaron
  • LillyM_9417's avatar
    LillyM_9417
    Icon for Altostratus rankAltostratus
    May 03, 2011

     

    It will be great for us to open a case. I can provide tcpdump and other files.

     

     

    Thanks a lot.

     

     

    I m lookşng forward your response.