Find machines looking up a particular DNS entry

A DNS entry was modified to point from an old server to a new server.
Example:
Old Server - ServerA.domain.com originally pointed to 10.10.10.10
New Server - ServerB.domain.com points to 10.10.10.12
Old Server (ServerA) is retired Original A Record now points to 10.10.10.12
I am now tasked with finding out which servers are still requesting the old ServerA.domain.com record so we can fix those requesting that name and eventually retire the name.
Any good way to find this information?
Bobby Pendino

I agree with ahctech to use the debug logging in dns to catch anyone requesting the DNS Name
Leave it on for 24 hours then turn it off and search it.
I also agree with Dirk that having the old A record pointing to the new IP shouldn't be an issue.
And I agree with Keith you can turn server A on and look at the iis logs if its a webserver.
Three very valid answers
Thanks,
Brad Held
Windorks.wordpress.com
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Brad Held's profile

Similar Messages

Change DNS entry from Java

I am looking for ways to update DNS entries in our DNS server on the fly from a Java web app. For example: Users can select a domain and modify its ip on the Java web site, then the DNS record is updated automatically.
Is this possible? Please help...

812256 wrote:
I am looking for ways to update DNS entries in our DNS server on the fly from a Java web app. For example: Users can select a domain and modify its ip on the Java web site, then the DNS record is updated automatically.
Is this possible?This is what happens when 'bind' and 'dhcp' work together - dhcp submits updates to bind.
You want to submit updates to 'bind' yourself - that should be possible but
you will need to "open up" your dns server so 'bind' accepts these updates from the machines that are allowed to submit them
and you will need to implement the appropriate protocol or find a library that does it.

Event Manager question. Monitoring DNS entry.

Hello everybody,
I want to use Cisco Embedded Event Manager in a router for monitoring a DNS entry that normally resolves 1.1.1.1 but if it changes to 2.2.2.2 the router has to change some access list automatically in order to permit different routes.
I know how to configure de "action" sentences for change the ACLs but I dont know how to configure a track or a SLA in order to check the DNS entry and react if it changes.
Someone knows how to do that?
event manager applet ChangeRoutesWhenDNSEntryChanges
event track 21 state ??????????????????????????????????????????????????<----------
action 1.0 cli command "enable"
action 2.0 cli command "configure terminal"
action 3.0 cli command "ip access...
Thank you in advance!!
Marcos.

Indeed, I just provided the above example to demonstrate how we can force a DNS lookup and parse the IP address...
I was actually thinking about using the IP SLA DNS probe, but I could not find a way to get the IP address from the results... It just shows the response time.
In order to make the script work, we would most likely need to use some timer to trigger it periodically.
This is an adaptation of my previous example to actually accomplish a periodic check:
event manager applet CHECK-DNS
event timer watchdog time 60
action 1.0 cli command "ena"
action 1.1 cli command "ping host1 repeat 1 timeout 0"
action 2.0 regexp "ICMP Echos to (.*), timeout is 0 seconds:" "$_cli_result" _match _ip
action 3.0 if $_ip ne 1.1.1.1
action 4.0 syslog msg "host1 is now $_ip"
action 5.0 end
If you want to do something as a reaction to detecting the change, that would have to go into the "4.0" block (you can use 4.1, 4.2 etc)
Another thing to consider is that this script would run every minute, so as long as the DNS query resolves to anything but 1.1.1.1 we would re-apply the config changes, which is not that good...
A way to solve this can be seen in the next example:
event manager applet HOST1-NOT-1.1.1.1
event timer watchdog time 60
action 1.0 cli command "ena"
action 1.1 cli command "ping host1 repeat 1 timeout 0"
action 2.0 regexp "ICMP Echos to (.*), timeout is 0 seconds:" "$_cli_result" _match _ip
action 2.1 track read 100
action 3.0 if $_ip eq 1.1.1.1
action 4.0 if $_track_state eq down
action 4.1   track set 100 state up
action 4.2   syslog msg "host1 is now 1.1.1.1 again"
action 4.9 end
action 5.0 else
action 6.1 if $_track_state eq up
action 6.2   track set 100 state down
action 6.3   syslog msg "host1 is not 1.1.1.1, new ip is $_ip"
action 6.9 end
action 7.0 end
Basically we are using a stub tracking object to maintain state. Track object 100 would be up if we know host1=1.1.1.1, but if we detect it is something else we change it to down. Only after we detect that host1=1.1.1.1 again we change the track object back to up, which would enabled detecting another change...
Any actions you want to take should go into section "6" and any clean up (when host1=1.1.1.1 again) has to go into section "4".
It is possible to make this detect any change and not just have a static 1.1.1.1 value by assigning the newly detected value to a variable and basically look for a change... Not sure what is your requirement.
The output below shows how this works...
Router#show run | inc ip host
ip host host1 1.1.1.1
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#ip hos
Router(config)#ip host host1 2.2.2.2
Router(config)#^Z
Router#
*Nov 9 18:23:18.009: %TRACKING-5-STATE: 100 stub   Up->Down
*Nov 9 18:23:18.021: %HA_EM-6-LOG: HOST1-NOT-1.1.1.1: host1 is not 1.1.1.1, new ip is 2.2.2.2
Router#
*Nov 9 18:23:18.065: %SYS-5-CONFIG_I: Configured from console by console
Router#
Router#
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#ip host host1 1.1.1.1
Router(config)#^Z
Router#
*Nov 9 18:23:42.805: %SYS-5-CONFIG_I: Configured from console by console
Router#
*Nov 9 18:24:18.025: %TRACKING-5-STATE: 100 stub   Down->Up
Router#
*Nov 9 18:24:18.033: %HA_EM-6-LOG: HOST1-NOT-1.1.1.1: host1 is now 1.1.1.1 again

DHCP creating DNS entries in domain root.

Hello,
I have a Windows DHCP server in a child domain that serves leases to Windows and Linux clients. It also create DNS records for all current leases as well. Recently I noticed it it was creating the DNS records for a few Linux machines in the domain
root DNS and not the client domain DNS.
Is there a way to prevent the dynamic account from creating dns records in the domain root dns?
Thanks!
Shawn

Can we get some more info on your config?
- Is this only affecting non Windows boxes?
- Are your DNS zones forest integrated or just domain integrated?
- Are the DNS servers configured for the scope in the child domain and only hosting the child DNS zones?
- Is the DHCP in the child or root domain?
When dynamic DNS registration happens, it sends the DNS update to the DNS server. What I'm looking for right now in the technical manual is whether the DHCP server sends it to the scope's DNS servers or if it's using it's own DNS servers. If
the DNS server is in the root domain, maybe that could be an issue.
- If you find my posts to be helpful (or the answer), please mark them appropriately.
Chris Ream

N73 Alternate DNS entries

Hi
I've heard that by updating the primary and alternate DNS entries for mobile browsing, the speed of pages loading can be increased. The article is here (www.pcpro.co.uk/links/155mob1) but only includes instructions on how to do this for Pocket PC/Windows Mobile devices.
I'd like to try this on my N73, but the problem seems to be that the Contract Internet settings are protected and can't be updated or even copied.
Is there a way to find these settings and set up a new access point then enter the new DNS addresses?
I've looked on the net for these without success.
Thanks for any help.

Hi Shawn,
I am looking for another feature:
As the ISA akts as an DNS forwarder, I want to add specific DNS records to the Box. This scenario is especially for small networks not having a DNS server implemented, to resolve internal services - or this can be used for a special DNS rewriting.
How can I add hosts records to the DNS resolver?
Regards Mike

How to look for a particular field in the segments of IDOC ?

Hi,
I am looking at a particular IDOC which I will use to do data trasfer from lgacy to R/3 using BAPI in LSMW. Now I know a field which is required to create a given business transaction when igrating data. But there are 100's of segments on the IDOC.
Is there a way I can see if the given field is present in any of the IDOC segment ? I don't want to dig though each and everys egment and find it out...
Regards,
Rajesh

Try using WE09..There you have the option of searching by the idoc data..CHeck in the bottom of the selection screen
Thanks,
Naren
Message was edited by: Narendran Muthukumaran

Scan\Look for a particular character in a file

I would like to look for a particular character(@) in a file. The character might be in a word. When if find the character I want to read the actual whole word that contains that character.
What's the best way of going abt this?
Thx,
Kapapra.

Read the file line by line using BufferedReader.
Tokenize each line on space.
Loop through the token strings.
For each token that contains the character that you are looking for (e.g. @) found using indexOf operator of the String class, print or save (or whatever you want to do with that token) that token.
Continue reading the file line by line till the end of the file.
Does this make sense? Look the java.io package API for the details on how to read the file and stuff.
If anyone has more effecient method to do this, please share.

How to find the location of a particular font in the framemaker book?

Hi All,
please help me in finding the location of a particular type of font in the framemaker book. I was using the following procedure to find out earlier:
Find > Character Format > (set the character format) > Search.
Now I am unable to locate a particular type of font using the mentioned procedure.
Please help me out.
Thanks in adnavce,
Mindevil

This assumes that the font instance being searched for is an override:
Click in some text in one of the book files.
Edit > Find/Change
[ Character Format ...]
This pops up a Character Format dialog.
Assuming you are on Windows:
[Ctrl]+[Shift]+[F8] to set everything to As-Is/blank.
In Family:, select the font being sought. [Set]
Back in the Find dialog...
Look in: <*> Book
[Find]
If the font instance is part of a Paragraph Format or Character Format, you can search by Para Tag name or Char Tag name (which is yet another reason why overrides are a problem).
Or you can save out all the book files as MIF and search with a plaintext editor, but that requires a nominal knowledge of MIF.
I might add that steps 1-3 above are covered in FM7.1 Help (and presumably the printed manual back then), but are absent for FM9, and I'm guessing that they never returned in later versions either.

Can't save dns entries

I recently had a server that's ip changed. I set it up as static, the hostname appeared fine. I ran changeip -checkhostname and got the new ip address with the hostname x.x.x and it said that the dns entries were bad and needed to be repaired. I did changeip old ip new ip and it said I needed to match the hostname too so I did changeip o n o n for both. It looked like everything went fine. Still able to connect and I rebooted too I think. Then I went to dns and edited the primary zone, a record, web service and reverse zone. I removed them all at one point and tried to re-add them. Whatever I tried whenever I tried to enter all the information for both after pressing save it deleted all entries except the primary zone which didn't have a nameserver listed. I'm sure that I entered all the information correctly except the primary zone name may be x.x.x where before it was x.x. I tried both x.x.x and x.x and neither would save. At one point I restarted and there weren't any entries listed there save the one incomplete one and now I can't access the server because I think its dns info isn't valid. A ping brings nothing. So I have to help someone change the information. Can anyone help with this? changeip -checkhostname and host both came back fine with the exception that the dns entries needed to be changed in the first.
Also, the hostname is a registered hostname but because the ip changed recently when setting up a new router dyndns hasn't been updated. I don't know if this causes a problem when trying to save a dns record without it being able to identify the hostname or not.

One other thing is that whenever it would auto create a reverse zone or even in the primary one, the default ip listed before I change it is always 10.0.0.1 instead of 10.0.1.7 which is what it is now. It has never been the former that I know of. When setting up the reverse zone, the entry looked correct but I couldn't change it It had the reverse ip minus 7. at the beginning. That didn't seem right and when I tried to change it it just kept what was listed.

Servermgr_dns: no reverse DNS entry for server

Hi all,
After installing and configuring OS X Server, Tiger, I realized I had given the machine the wrong IP-address. After changing it, I'm getting the following errors every half hour:
Jun 28 12:54:26 g4 servermgrd: servermgr_dns: no name available via DNS for 10.0.0.3
Jun 28 12:54:26 g4 servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly
Can anyone enlighten me, as to wether this is something serious or not. The server is running fine, so it isn't mission critical, but you know, nobody likes error messages
PowerMac G4, Dual 1.25, 768 MB RAM, Pro ADSL 4096/768 Mac OS X (10.4.6) Mac OS X Tiger Server

look at changeip
<pre>
~>man changeip
changeip(8) BSD System Manager's Manual changeip(8)
NAME
changeip -- Change IP adress related configuration.
SYNOPSIS
changeip -checkhostname
changeip [directory-node | -] old-ip new-ip [old-hostname new-hostname]
DESCRIPTION
changeip is used to update configuration records when a server's IP
address changes or check/fix the hostname of the server. It needs to be
run by root on the machine who's IP address is changing. If the machine
is hosting a parent directory (NetInfo or LDAP) or is connected to a par-
ent directory, then the Open Directory path to the node must be used (eg
/LDAPv3/192.12.0.43). Otherwise use a dash ("-") for the directory node
argument. The tool may prompt for an admin user name and password for
the directory node. After the tool has successfully completed, change
the network settings in the Network Control Panel and reboot the server.
</pre>
you need to run this when you change your servers ip
hope this helps.

Lync Server 2013 STD pool pairing - certificate questions & DNS entries

Hi guys!
We are thinking about paired pools scenario, but we have one question regarding about certificates requriments on 2nd std pool lync server.
Our current (and only one) front end server (std edition) has this certificate entries:
CN=lync.domain.local
DNS Name=lync.domain.local
DNS Name=sip.domain.com
DNS Name=admin.domain.local
DNS Name=LyncdiscoverInternal.domain.com
DNS Name=lyncreverseproxy.domain.com
DNS Name=Lyncdiscover.domain.com
DNS Name=dialin.domain.local
DNS Name=meet.domain.com
which certificate entries should then have a paired std pool lync server?
bostjanc

Are you talking about the default cert assigned to the Lync Front Ends or the public certs?
If you are talking about the Lync Front End default cert (and you are using an internal CA) then simply get the second Lync Front End servers cert using STEP 3 of deployment wizard.
Assuming the FQDN of the 2nd std edition is lyncFE2.domain.local, it should look something like this:
CN=lyncFE2.domain.local
DNS Name=lyncFE2.domain.local - Front End #2 FQDN
DNS Name=sip.domain.com - for Lync Phone Edition (2 x DNS entries, 1 to each FE)
DNS Name=admin.domain.local - CSCP (2 x DNS entries, 1 to each FE)
DNS Name=LyncdiscoverInternal.domain.com - mobile clients (2 x DNS entries, 1 to each FE)
DNS Name=Lyncdiscover.domain.com - mobile clients
DNS Name=lyncreverseproxy.domain.com - External Lync web services
DNS Name=dialin.domain.com (assume the .local was a typo?)
DNS Name=meet.domain.com - both meet and dialin (2 x DNS entries, 1 to each FE)
Please mark posts as answers/helpful if it answers your question.
Blog
LyncSorted

Allocating a (local/in-house) IP address and DNS entry for a cabled Ethernet printer

I have an MI424WR Fios modem/wireless router. I have a laser printer connected to it using standard CAT-5 cabling.
I have tried several times to create a persistent enough IP address so that I can configure a Windows (Windows 7 and Windows 8) printer and printer port and get it to work over time. On ever other router I've had, I was able to configure a static IP address and configure a local DNS entry for it (which meant I could just configure printer ports looking for http://colorlaser - very easy to remember)
I think I have it working, then I leave it for a few days and the IP address evaporates and the driver stops working. The MI424WR advanced menus are nearly indecipherable (compared to *every* other home router I've ever used) and I'm running out of curse words to use when trying to get this to work.
Any ideas?
Thanks
Flydog
(PS: I'm very impressed that your "Spell Check" refuses to recognize "Fios")

I've solved this exact issue by configuring a static DHCP lease in the router for the printer. This way, I don't have to change any settings in the printer; which can be difficult depending on how the printer is configured.
Yes, I agree that the Actiontec router has a rather unfriendly interface. However, it is quite powerful once you figure out where everything is hidden.
Here's the process to setup a static DHCP lease for a printer (or any other device):
Make sure your printer is on and assigned an IP address.
Login to router
Click "My Network" in the top banner menu.
Click "Network Connections" in the left hand menu.
Click "Network (home/office)" in the Network Connections box.
Click "IP Address Distribution" in the Network (home/office) Properties box. Note it is hard to notice this is a link - click on the words.
Click on the "Connection List" button at the bottom of the IP Address Distribution Box.
Locate your printer in the list. The host-name may be something assigned by the router.
Click on the edit button in the Action column for the printer. The edit button is the center icon with a pencil on it.
Click the "Static Lease Type" checkbox.
Click Apply.
Click the edit button for the printer's DHCP entry AGAIN.
Now, you can set the IP address to any value within the router's DHCP range. You may also want to change the host name to something that make sense to you.
You can also try the "New Static Connection" at the bottom of the DHCP connection window, however I've not had much luck with it.
Good Luck!
If a forum member gives an answer you like, give them the Kudos they deserve. If a member gives you the answer to your question, mark the answer as Accepted Solution so others can see the solution to the problem.

Content query web part is not working after chaning the DNS entry

Hi all,
We have a content query web part in the sharepoint site but it is not working after changing the DNS Entry for the web site ipaddress from one server to other . But it is working fine on the server, if we try to access the site from other system content
quey server its not working fine and its giving error message as bellow.
Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.
Can anyone help me to fix this issue please.

I have custom XSLT . But it is working fine before changing the dns entry as soon as we change the DNS entry the content quey web part is not working. I tried to delete the content query web part and add it once again to the page, As soon as content query
web part is added to the page the fallowing error message is displayed.
Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.
Can anyone help me to fix this issue please.

I have an iMac 5.1 which is running OSx10.5.8 - it runs very slowly and I can't find if there is a particular problem. In the process, I have tried to install 10.6 [I have a new iMac] and the 5.1 won't accept the install discs.

I have an iMac 5.1 which is running OSx10.5.8 - it runs very slowly and I can't find if there is a particular problem. In the process, I have tried to install 10.6 [I have a new iMac] and the 5.1 won't accept the install discs.

As you have discovered... you cannot use the install discs from another Mac...
Re the iMac running OS X 10 5 8... and for your New Mac...
See Here for keeping your Mac Happy...
http://support.apple.com/kb/HT1147
http://www.thexlab.com/faqs/maintainingmacosx.html
http://www.thexlab.com/faqs/performance.html

Looking for a particular vlaue in a id array

i have a program which generates me 1000000 sample values ie a array of 1 million values.in this 0ne million values i need to look for a particular range of values ie allthe values in the array are 4 and then they ia a value like say 10 and some more values. i need to detect the values greeater than four and then take the 20 values from the index where it is detected. i may have hundered of this pattern in the million samples.

I am attaching a VI which does what you want. The diagram is pretty straight-forward. Let me know if you don't understand anything.
Regards,
Khalid
Attachments:
chkarray.vi ‏34 KB

Find machines looking up a particular DNS entry

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