Show Bid Request
Set DNS caching value / Java /Tomcat
Bid Request Id: 29206
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Posted by: |
InProd (20 ratings)
(Software buyer rating 10 )
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Non-action Ratio: |
Very Good - 19.35%
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Posted: |
Sep 29, 2002
6:49:05 PM EDT
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Bidding Closes: |
Oct 1, 2002 EDT
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Viewed (by coders): |
78 times
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Deadline: |
10/3/2002
TIME EXPIRED
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Description:
I am using Java 1.3.1_02 servlets with Tomcat 3.2 / Apache. I would like to reset the DNS caching parameter
networkaddress.cache.ttl. Where do I do this? Java.policy? Explanation follows.
The InetAddress class has a cache to store successful as well as unsuccessful host name resolutions. The positive caching is there to guard against DNS spoofing attacks; while the negative caching is used to improve performance.
By default, the result of positive host name
resolutions are cached forever, because there is no general rule to decide when it is safe to remove cache
entries. The result of unsuccessful host name resolution is cached for a very short period of time (10 seconds) to improve performance.
Under certain circumstances where it can be determined that DNS spoofing attacks are not possible, a Java security property can be set to a different
Time-to-live (TTL) value for positive caching. Likewise, a system admin can configure a different negative caching TTL value when needed.
Two Java security properties control the TTL values used for positive and negative host name resolution caching:
networkaddress.cache.ttl (default: -1)
Indicates the caching policy for successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the successful lookup. A value of -1 indicates "cache forever".
networkaddress.cache.negative.ttl (default: 10)
Indicates the caching policy for un-successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the failure for un-successful lookups. A value of 0 indicates "never cache". A value of -1
indicates "cache forever".
Deliverables:
Description of exactly where to change parameters in Tomcat or Java
Platform:
Windows
Linux
Must be 100% finished and received by buyer on:
Oct 3, 2002 EDT
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Bidding/Comments:
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Bid Amount
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Date |
Coder Rating |
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This bid was accepted by the buyer!
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$10 (USD)
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Sep 29, 2002
8:40:37 PM EDT
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10
(Excellent)
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Hi Friend,
I have gone through your problem statement. The problem/question you mention is related to java net. The properties you can set in a couple of ways:-
#1. You can set like this within your code
System.setProperty('networkaddress.cache.ttl','0')
#2. Modify your java.security file with the appropriate properties. java.security file is located in JDK_HOME\jre\lib\security directory of your JDK installation. Add the following line to that file
networkaddress.cache.ttl=0
#3. If your application is an console application you can also set as runtime parameter ie. like -Dnetworkaddress.cache.ttl=0
Hope i have given necessary information regarding your problem/question. Pls feel free to contact for any other information.
Also if u have any questions/problems/projects in future, kindly contact me. I will give my best.
Thanks/regards,
BismiSoft.
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