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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » How does ACE work with "reverse IP lookup" ?

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hunghip95
PostPosted: Mon Jan 04, 2021 2:00 am    Post subject: How does ACE work with "reverse IP lookup" ? Reply with quote

Apprentice

Joined: 12 Oct 2017
Posts: 30

Hi all,

Scenario:
- I'm trying to disable "Reverse IP Lookup".
- ACE is running on AIX OS.
- There is a Client (10.0.81.52) calls to ACE'service (10.0.81.53:7800/service/vn/authen/authensvcs/1).
- There is no entry in both DNS Server and /etc/hosts.
- To disable "Reverse IP Lookup", my idea is using "cache forever" for unsuccessful IP in IBM JVM.

Action:

- I configured the java.security:

Code:
networkaddress.cache.ttl=-1

networkaddress.cache.negative.ttl=-1


- I used mqsichangeproperties:

Code:
mqsichangeproperties ACE11NODE -e MainServer -o ComIbmJVMManager -n jvmSystemProperty -v "-Dsun.net.inetaddr.negative.ttl=-1"


- MainServer was restarted.

Problem:

- It seems not to cache the "unsuccessful IP".
- It still lookup IP in DNS Server.  I captured by using tcpdump:
https://drive.google.com/file/d/1SH9PPsMO25sHkmg-kIohq-MJRm838GBV/view?usp=sharing
- This is the whole captured file:
https://drive.google.com/file/d/1XrDOFAzmsddedvNTuJli9xiZpwBqp4wN/view?usp=sharing

Question:

- What is the purpose of "Reverse IP Lookup" ? Is it for System Logging or something else ?
- How to disable "Reverse IP Lookup" ?
- Why doesnt my configuration work ?


Thank you very much.
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