+ Post New Thread
Results 1 to 3 of 3
Wireless Networks Thread, DNS reverse lookup problem - NSlookup in Technical; Hi, We are having issues with reverse lookup on DNS. The scenario is this: When I run nslookup command in ...
  1. #1

    Join Date
    Sep 2009
    Location
    Northern Ireland
    Posts
    32
    Thank Post
    3
    Thanked 0 Times in 0 Posts
    Rep Power
    0

    Thumbs down DNS reverse lookup problem - NSlookup

    Hi,

    We are having issues with reverse lookup on DNS. The scenario is this:

    When I run nslookup command in the format "nslookup computername" eg nslookup ot11-wks01, it will contact the primary DNS server and return the correct IP address for that computer, in this example I will use 10.50.23.20 as the returned ip address.

    If I then run nslookup on the IP address eg nslookup 10.50.23.20 it will return the FQDN of a completely different computer.

    I believe this to be a reverse lookup problem. It may not seem important but we use 8e6 iR3000 as our web filter and review the websites students are viewing regularly. the r3000 returns IP addresses used to access websites and we need to be able to resolve the ip address to a computer name in order to locate the offending user in the college. We had an occasion recently where a student was falsely accused of accessing a computer in a staff area because nslookup returned the wrong computer name

    My DNS settings on reverse lookup zones are:
    Scavenging time 7 Days (actually another technician has just changed this to 1 hour for testing)
    refresh interval 15 mins
    expires after 1 day
    Minimum Time to Live 1 hour

    Under DHCP settings the DNS tab is
    Enable DNS Dynamic updates (tick)
    Always Dynamically update DNS A and PTR records (tick)
    Discard A and PTR records when lease is deleted (tick)
    Everything else unticked

    There's alot of information there so thanks for anyone who took the time to read it and I hope someone can help.

  2. #2

    Join Date
    Apr 2010
    Posts
    1
    Thank Post
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    We’ve recently launched new competitive research tool that allows you to do reverse IP lookups on websites just like myipneighbours.com and similar tools. But it also does much – more you can look up related websites based on Google Analytics and Adsense IDs and nameservers. The tool is FREE to use.

  3. #3

    Join Date
    Mar 2010
    Location
    Adelaide
    Posts
    133
    Thank Post
    2
    Thanked 19 Times in 17 Posts
    Rep Power
    12
    It is your DNS server, I had the exact same problem. Your settings look correct and I matched them to my server, unfortunately it was over 7 months ago I fixed it and cannot remember exactly what I did. I do remember I deleted all leases after hours just to clear them as scavanging was not grabbing all the old ones. If it comes back to me I will be sure to post but if you have any event viewer errors/warnings for DNS post them, it may jig my memory.

SHARE:
+ Post New Thread

Similar Threads

  1. DNS & NSLOOKUP questions.
    By kennysarmy in forum Windows
    Replies: 4
    Last Post: 3rd October 2008, 11:49 AM
  2. excel lookup problem, can someone help me please?
    By RabbieBurns in forum Windows
    Replies: 3
    Last Post: 2nd July 2008, 12:51 PM
  3. dotNet: DNS PTR (reverse) queries
    By PiqueABoo in forum Coding
    Replies: 4
    Last Post: 16th June 2008, 11:49 PM
  4. DNS reverse look up zones.
    By Kyle in forum Windows
    Replies: 1
    Last Post: 16th October 2007, 08:42 AM
  5. DNS Forward Lookup Zone query
    By SpuffMonkey in forum Windows
    Replies: 0
    Last Post: 19th February 2007, 04:20 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •