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Show Bid Request

Set DNS caching value / Java /Tomcat
Bid Request Id: 29206
Bookmark in my 'To Do' list
Posted by: InProd (20 ratings)
(Software buyer rating 10)
Non-action Ratio: Very Good - 19.35%
Posted: Sep 29, 2002
6:49:05 PM EDT
Bidding Closes: Oct 1, 2002 EDT
Viewed (by coders): 78 times
Deadline: 10/3/2002
TIME EXPIRED
Phase:
100% of work completed and accepted. Coder has been paid.
Max Accepted Bid: Bidding is closed
Project Type: Question or Beginner / Newbie Assistance
Bidding Type: Open Auction
Categories: Java, Network, Network Implementation, Security
Enter chat room for this bid request
(0 active users at May 7, 2003 8:51:55 PM EDT)

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
Deadline legal notes: All times are expressed in the time zone of the site EDT (UT - 5). If the buyer omitted a time, then the deadline is 11:59:59 PM EDT on the indicated date.


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See all rejected bids (and all comments)
Name   Bid Amount 
 
Date   Coder Rating  
This bid was accepted by the buyer!
BismiSoft
(4 ratings)
in Kuala Lumpur, Selangor
Malaysia
Bid id: 327,457
 
$10 (USD) Sep 29, 2002
8:40:37 PM EDT
 10
(Excellent)
   
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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