zey1996 commented on issue #23843:
URL: https://github.com/apache/pulsar/issues/23843#issuecomment-2594302264

   > Yes, that is expected. The last parameter "wins".
   > You can use the jinfo -sysprops 1 or jcmd 1 VM.system_properties commands 
in the shell to check effective values.
   I do this. but I can't understand, It looks like it could work.
   ``` bash
   my-release-pulsar-broker-2:/pulsar$ jinfo -sysprops 1|grep IP
   java.net.preferIPv4Stack=false
   my-release-pulsar-broker-2:/pulsar$ jcmd 1 VM.system_properties|grep IP
   java.net.preferIPv4Stack=false
   ```
   
   ---
   I found `-Djava.net.preferIPv4Stack=true` be set in `bin/pulsar`, and 
there's no switch. Can I overwrite it without modifying the image?
   Maybe we can add a switch?


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