IP reverse lookup slow
Hi!
I�m trying to create a socket by using the constructor
new Socket(host, port)
where the host can be a hostname like sun.com or a textual representation of an IP.
When creating this socket using a textual representation of an IP and the port the jvm makes a reverse lookup to get the real hostname for that IP. If the reverse lookup failes
(there is no hostname connected to this IP) the creation of the socket takes 5-10 seconds.
How can I prevent the socket from doing this lookup?
My application makes HTTP requests to an IP with no revers lookup hostname.
Bad performance because of the lookup is my big problem here....
Regards
Porcaro
There are ISPs out there who don't give reverse lookups; convincing all of them to fix their DNS is a pretty big task...
Here is one horrible hack that seems to get around the reverse lookup:
new Socket(InetAddress.getByAddress("10.10.10.12", new byte[] { 10, 10, 10, 12 }), 80);
You'd have to write or find a numeric address -> byte[] parser. Extra credit for handling IPv6 addresses. getByAddress() exists from JDK 1.4 onwards.
I hope someone comes up with a better way. Or unzip src.zip in the JDK and rummage around Socket.java, InetAddress.java and related to see if you find a way.
Similar Messages
-
Remove Old Name Servers from reverse lookup zones in DNS- PowerShell
Hello Scripting Guys,
I'm a long-time fan. Please let me know if I have included enough information for you to provide some guidance. Thank
you!
Here is what I am attempting to do:
import a .csv file which contains
zoneName,hostname,RecordType
and then delete the name server entries from the reverse lookup zones.
Why:
There are hundreds of zones and 80+ name servers in each for a total of about 25,000 records to be removed. I
have the list of zones and the list of name servers which I want to remove from the zones.
Environment:
I am running PowerShell as a Domain Admin with access to DNS. Zones allow secure updates only (if that matters here).
I am running it from a Server 2012 R2 server with the DNS admin tools installed against Server 2008 R2 DNS servers. Current AD functional level Windows Server 2003. All DC are DNS server and GC's.
What I have tried:
The following
works to return all the Name Server records in a zone:
.csv file format
zoneName,hostname,RecordType
1.112.170.in-addr.arpa,nameserver1.contoso.com.,Ns
1.112.170.in-addr.arpa,nameserver2.contoso.com.,Ns
1.112.170.in-addr.arpa,nameserver3.contoso.com.,Ns
2.112.170.in-addr.arpa,nameserver1.contoso.com.,Ns
2.112.170.in-addr.arpa,nameserver2.contoso.com.,Ns
2.112.170.in-addr.arpa,nameserver3.contoso.com.,Ns
Script\Command:
Import-Module DnsServer
$PDCE = Get-ADDomainController -Discover -Service PrimaryDC
import-csv c:\temp\OldNSrecords-test.csv | foreach {
Get-DnsServerResourceRecord -ZoneName $_.zoneName -RRType "Ns" -computerName $PDCE
-Node
OutPut to screen:
HostName RecordType Timestamp TimeToLive RecordData
@ NS 0 1:00:00 Nameserver1.contoso.com
@ NS 0 1:00:00 Nameserver2.contoso.com
However, replacing the business line (in green above after foreach) with the remove command (in red below)
does not work to delete the specific record listed in the .csv, even though it follows the
pattern from MS TechNet:
Remove-DnsServerResourceRecord -ZoneName $_.zoneName -RRType "Ns" -name $_.hostname -computerName
$PDCE
Error:
PS C:\Windows\system32> C:\Temp\OldNSCleanup.ps1
Remove-DnsServerResourceRecord : Failed to get nameserver1.contoso.com. record in
1.112.170.in-addr.arpa zone on PDCE server.
At C:\Temp\OldNSCleanup.ps1:4 char:1
+ Remove-DnsServerResourceRecord -ZoneName $_.zoneName -RRType "Ns" -name $_.name ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (PDCE:root/Microsoft/...rResourceRecord) [Remove-
DnsServerResourceRecord], CimException
+ FullyQualifiedErrorId : WIN32 9714,Remove-DnsServerResourceRecord
When I remove the use of the .csv and put the names of the zone and server in the command, I get the same results.
Fail.
It's as if the record does not exist, but I can browse to it in the GUI. I found
this about Missing Glue records, but it does not seem to apply to reverse lookup NS records. I'm thinking that I need to first load each zone into an assembly and then do the removal,
but I'm not sure how to do that in PowerShell. I tried piping the get command for the zone to the remove command, but that did not work or I did not have the correct syntax.
I have attempted to use DNSCMD to do the same and that command appears to work, but then fails to actually remove
the record.
Here is an example of that command:
import-csv C:\Temp\OldNSrecords-test.csv | foreach {dnscmd.exe "DNSServer.contoso.com" /Recorddelete $_.ZoneName
$_.hostname $_.recordType /f}
Output:
Deleted Ns record(s) at 1.112.170.in-addr.arpa
Command completed successfully. [But not really, the NS record is still there]
I have researched several sites including the suggest one here, but this does not fit my requirement.
http://social.technet.microsoft.com/Forums/scriptcenter/en-US/97070ff2-59e2-4f34-9c39-054048e008af/automatically-delete-removed-dcname-servers-and-automatically-add-new-dcname-servers-in-reverse?forum=winserverDS
http://technet.microsoft.com/en-us/library/jj649872.aspxHere is a backing store for the root servers in the DNS format:
; formerly NS.INTERNIC.NET
. 3600000 IN NS A.ROOT-SERVERS.NET.
A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4
; formerly NS1.ISI.EDU
. 3600000 NS B.ROOT-SERVERS.NET.
B.ROOT-SERVERS.NET. 3600000 A 192.228.79.201
; formerly C.PSI.NET
. 3600000 NS C.ROOT-SERVERS.NET.
C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12
; formerly TERP.UMD.EDU
. 3600000 NS D.ROOT-SERVERS.NET.
D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90
; formerly NS.NASA.GOV
. 3600000 NS E.ROOT-SERVERS.NET.
E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10
; formerly NS.ISC.ORG
. 3600000 NS F.ROOT-SERVERS.NET.
F.ROOT-SERVERS.NET. 3600000 A 192.5.5.241
; formerly NS.NIC.DDN.MIL
. 3600000 NS G.ROOT-SERVERS.NET.
G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4
; formerly AOS.ARL.ARMY.MIL
. 3600000 NS H.ROOT-SERVERS.NE
Notice that each is a pair.
One is the NS and the secon is the A record.
. 3600000 NS G.ROOT-SERVERS.NET.
G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4
In this case the dot represents the self reference to the A record. These are the records that bootstrap all of the Internet. Remove them and you ae lost.
The CSV uses the @ to anchor the local domain. Perhaps the DNS CmdLets prefer the dot. The @ is what appears on the screen when we use the GUI. Note the dot at the end of the FQDN. It is required. Even browser use
it but they add it if you forget.
¯\_(ツ)_/¯ -
How to do a reverse lookup on a value set?
I have a concurrent program which has multiple paramaters with various value sets. When I run reports, I want to dynamically list on the output the parameters the user gave. The problem is that these values are often the IDs and not the value the user sees.
Are there any packages in applications that will let me to do a "reverse lookup" with the value sets to get the values the user saw?
Thanks,
Kurzweil4Hi Stomie,
Based on your description, the network ID of your reverse lookup zone is 172.16.160.
To create a reverse lookup zone, please follow steps below,
Right click Reverse Lookup Zones, click New Zone, choose proper settings of
Zone Type, Active Directory one Replication Scope,
Reverse Lookup Zone Name type based on your actual situation.
In the Reverse Lookup Zone Name page, check Network ID
radio button, enter the network ID. For example, if the network ID is 172.16.160, then enter 172, 16, 160 in order. Then you will see it appears
160.16.172.in-addr.arpa in the Reverse lookup zone name edit.
Or in the Reverse Lookup Zone Name page, check
Reverse lookup zone name radio button, then enter the name of the reverse lookup zone directly. Such as, enter
160.16.172.in-addr.arpa in the edit.
Click Next twice, click Finish.
Reverse lookup zone name end up with in-addr.arpa.
Best Regards,
Tina -
Hi
I am Setting A Lab Scenario That the PC name "Core2012" i.e. Server Core 2012 Will be Domain Controller.
Using PowerShell I have done this Task
Change hostname ; Configure IP address and Preferred DNS address ; Disable IPv6 ;
Configure Firewall ; Even Active Directory Role install.
Now problem occur
Well I have know to install DNS role install-WindowsFeature DNS
Ok
But;
How to configure FQDN ; Restore mode password ; Setting up global catalog server ;and configure Reverse Lookup zone Using powershell
I have search many Forums but I am not getting to touch with it.
So I Need a help to set and Configure DNS using Powershell
Thank You!!!
sagarpdalviHi Sagarpdalvi,
To set the Safe mode password with powershell, please refer to the cmdlet Install-ADDSDomainController, to enable global catalog(GC), please run the cmdlet "Set-ADObject" after install Active Directory on the core server, to configure Reverse Lookup zone,
please refer to the cmdlet
Add-DnsServerPrimaryZone.
To configure DC with powershell, please check the scripts:
Installing a Domain Controller on Windows Server 2012
R2 Core
Enabling and Disabling the Global Catalog
To configure DNS, the Domain Name System (DNS) Server Cmdlets should be helpful for you:
http://technet.microsoft.com/en-us/library/jj649850.aspx
I hope this helps. -
DNS - NS entry on reverse lookup has changed - how to reset?
Hi,
When I view the DNS setup through the GUI in server admin everything looks as it should. However when I use Lookup in Network Utility there is a problem with the ns entry.
Using lookup on the servers FQDN (xserve.company.com) returns the correct NS entry, which is xserve.company.com. However when I query the servers IP address to perform a reverse lookup the NS entry shows ns.company.com
when I intially set up DNS all was checked and verified. Recently someone on site stopped some services and performed a hard reboot of the server as they thought it had frozen. Next time I came to the site to check things I noticed this NS entry discrepancy.
How do I or indeed can I get the NS entry on the reverse lookup back to xserve.company.com?
ThanksHi Jeff,
Config files in /var/named/zones appear to contain the incorrect NS entries
There are two files in the zones directory:
db.0.1.10.in-addr.arpa.zone.apple
**$TTL 10800**
**0.1.10.in-addr.arpa. IN SOA ns.company.com. admin.0.1.10.in-addr.arpa. (**
**2009031300 ;Serial**
**86400 ;Refresh**
**7200 ;Retry**
**2592000 ;Expire**
**345600 ;Negative caching TTL**
**0.1.10.in-addr.arpa. IN NS ns.company.com.**
**10.0.1.10.in-addr.arpa. IN PTR xserve.company.com.**
**db.0.1.10.in-addr.arpa.zone.apple (END)**
and
db.company.com.zone.apple
$TTL 10800
company.com. IN +SOA xserve+ john.company.com (
2009042901 ;Serial
86400 ;Refresh
3600 ;Retry
604800 ;Expire
345600 ;Negative caching TTL
company.com. IN +NS xserve+
xserve IN A 10.1.0.10
xserve IN HINFO "Apple XServe" "OSX Server 10.5.6"
db.company.com.zone.apple (END)
What I notice is that there are the incorrect NS entries in the reverse zone file but there are also differences in the forward zone file compared to another correctly working server - namely that in the above case the SOA and NS entry simply consist of the name xserve but on the other server these entries have the full domain name. (I italicized these entries so you know which I am referring to)
I guess my questions now are:
1) Should I go ahead and backup these files and edit the NS entries in the reverse zone file?
2) Should I also edit the forward zone file SOA and NS entries to the full domain name?
3) Should I stop the DNS service prior to making these changes and restart it afterwards or make the changes and then stop it and start it?
Thankyou very much for your patience and time. -
Reverse lookup error when installing on Linux/MaxDb
Hello,
I'm trying to install NW CE 7.1 SP5 on Linux/MaxDB.
The OS is RedHat EL 5.
I've chosen all standard options, nothing custom/exotic.
When entering the database parameters I enter sap.mycompany.com as Database Host.
Then I get an error message saying:
This computer's host name is sap.mycompany.com but a reverse lookup returned 'sap'. This will lead to problems later on when starting the Web application server. SOLUTION: Insert a line ' 127.0.0.1 sap.mycompany.com' into the host file etc/hosts, and then continue with the installation.
The solution doesn't work and we're stuck here.
Thanks for your help
regards.Hi,
I had the same problem but I fixed it easy, I have changed the hostname and quitted the domain.
in other words, before the hostname was "sap.company.com" and then only "sap".
Nacho -
Change reverse lookup zone replication
We have a windows 2008 R2 domain / forest.
One Root domain and 2 childdomains. A DC/DNS server in the root domain is the scavenging server in the forest
Long story short, i noticed that the replication of the reverse lookup zone in one childomain, is set to All DC's in this domain, instead of to all DNS servers in the forest.
I want to change this because we have a lot of duplicate in the reverse zone, and encounter issues with remote desktop or remote asstistance.
Can i change this to "all DNS servers running on domain controllers in this forest" without any downtime / issues?
ThanxSuffixes should be configured on EVERY machine, not just DCs. This way any machine can resolve anything in the infrastructure. That's the goal to design DNS.
If you want to go to forest wide replication, the first thing you must do is set all child DCs to ONLY use the forest root DNS servers. Don't worry about servers and clients in the child domains at this time that may be pointing to the child DC/DNS for the
moment, because you will be doing this during a maintenance window and we'll get to them later... Stick with me a second...
Then you would change the replication scope on the parent root domain DNS servers ONLY.
Then WAIT for replication to happen. Go have lunch, go see a movie, etc... Then check the zone properties on a few DCs at the parent, and especially the child domains' DCs, to make sure that they reflect the zone is now set to forest wide replication.
Now on a child domain DC, create a test record. Check the partner DCs and the other child domain DCs, and the parent root domain DCs to see if it replicated. If it did, you're good to go.
Once you've confirmed that they are all showing forest wide replication, and the test worked, then change the child domain DCs to point to it's partner DC as the first entry, and itself or the loopback as the second entry.
And yes, delegate the _msdcs zone. First create the _msdcs.domain.local zone, and set updates to Secure Only, and put it in the forest scope. Then go to domain.local, right-click, delegate, type in _msdcs, and type in the forest root DCs' IP.
Hope that helps.
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights. -
Help on Converting clips so you can do the clip in reverse or slower mode
I am wanting to add the slower effect to one of my clips. But when I double click the section I want to have the effect on, it says you must convert this clip to make it run in reverse, slow, or faster.
How do I go about converting it so it could run in reverse or slow mode. I don't have an idea of where I am supose to convert and how. Thanks for any help in advance.Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
* [[Troubleshooting extensions and themes]]
In Firefox 4 [http://kb.mozillazine.org/Safe_mode Safe mode] disables extensions and disables hardware acceleration.
Check if there is an update available for your graphics display card driver.
* Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
In Firefox 4 you can use one of these to start in <u>[[Safe mode]]</u>:
* Help > Restart with Add-ons Disabled
* Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows) -
What is the simplest way to do reverse lookup at java Hashtable
Is there a way to reverse lookup, given the value and obtain the key?
Your best bet would be to design that in the first place instead of trying to use the original design for something it wasn't intended to do. For example, have a second hashtable where the values from the first hashtable are the keys and vice versa.
-
How to Do Value Set Reverse Lookup?
I have a concurrent program which has multiple paramaters with various value sets. When I run reports, I want to dynamically list on the output the parameters the user gave. The problem is that these values are often the IDs and not the value the user sees.
Are there any packages in applications that will let me to do a "reverse lookup" with the value sets to get the values the user saw?
Thanks,
Kurzweil4Kurzweil4,
Is your conc prog in OA code? anyway, you can always use a VO with proper sql to get the value lookup for the IDs.
--Shiv -
CSS one-armed-config and SMTP reverse lookup problems?
I was wondering if there would be potential reverse lookup problems from other company's when we try to send mail to their mail Domains.
If I configure failover for our mail server, I am thinking if we are sending mail, there could be a reverse-lookup issue, because our mail server would be configured with public IP Addresses other than what the MX record points to in DNS.
If we originate mail from our inside users, it will originate from the service IP address and not the VIP address.
Is this a valid concern?The main advantage of this configuration is that the web servers will receive the IP address of the client that made the request. This is often required by web servers' administrators for accounting purposes.
In a one-armed configuration only, the network port ( Enet0) is used on the SCA. Only this specific port can be used for this setup. Encrypted and decrypted traffic will go through the same link
http://www.cisco.com/en/US/products/hw/contnetw/ps2083/products_configuration_example09186a00801bbf4e.shtml -
Due to a knew provider I had to change all of our outside A and reverse lookup records. We can resolve names just fine but not IP's. We have a 24bit mask and I created our records with the last octet of each IP - ie x.x.x.249 has a reverse record of 249. Due to this problem we are having a lot of mail rejected by other institutions. I had one of them do an nslookup to our mail servers IP address for me and the result was - default server unavailable, server failed. Any ideas what might be wrong?
Thanks in advance
HazelA common mistake when creating in-addr.arpa zones is to enter a 0 for
the host portion of the IP rather than leaving the field(s) blank. For
example, you would end up with a zone named 0.1.168.192.in-addr.arpa
rather than 1.168.192.in-addr.arpa, which is the correct way.
If this is not the issue, please post your config and maybe a debug log,
and maybe someone will see the problem. -
Reverse Lookup not working as expected 2008 Domain
Lately I have been noticing that reverse lookup has stopped working in my environment. I had a couple of questions.
Can we specify the second octet for example 10.2. ? Would this resolve all IP addresses in 10.2.1 – 10.2.254 ?
When I run ipconfig /registerdns on the local machine it registers but reverse does not register. Any ideas?
I appreciate all the help.Hi,
Yes, you can specify the second octet. You can also specify the third octet if you wish.
Can you describe your environment a little more?
1. Are the clients domain joined and what DNS server are they pointing to for DNS resolution?
2. Is this DNS server authoritative for the reverse DNS zone?
3. What OS are DNS clients and servers running?
4. On the authoritative DNS server for the reverse zone, if you view the Security tab for properties of the reverse zone, what permissions are set?
Thanks,
-Greg -
Re: Where do I configure reverse lookup?
Thank you. Many times you can disable it for performance reasons. I wanted
to make sure that this was not the case here for when my code goes to
production.
Bob
"Dimitri I. Rakitine" <[email protected]> wrote in message
news:[email protected]..
> Isn't it supposed to always try to perform reverse lookup? I do
> not think there are any configuration settings.
>
> Bob Lee <[email protected]> wrote:
> > How can I verify that ServletRequest.getRemoteHost() is working
> > (configuration-wise)?
>
> > Thanks,
> > Bob
>
> --
> Dimitri
Ahhh, interesting. Thank you very much. I need to start taking advantage of
jdb more often.
Bob
"Dimitri I. Rakitine" <[email protected]> wrote in message
news:[email protected]...
> Out of curiosity:
>
> > stop in java.net.InetAddress.getHostName()
>
> and hit a page which calls request.getRemoteHost() :
>
> Breakpoint hit: "thread=ExecuteThread: '14' for queue: 'default'",
java.net.InetAddress.getHostName(), line=379 bci=0
>
> ExecuteThread: '14' for queue: 'default'[1] where
> [1] java.net.InetAddress.getHostName (InetAddress.java:379)
> [2] weblogic.servlet.internal.InetAddressCacheRecord.getRemoteHost
(ServletRequestImpl.java:2,437)
> [3] weblogic.servlet.internal.ServletRequestImpl.getRemoteHost
(ServletRequestImpl.java:1,331)
> [4] jsp_servlet.__test._jspService (__test.java:87)
> [5] weblogic.servlet.jsp.JspBase.service (JspBase.java:27)
> [6] weblogic.servlet.internal.ServletStubImpl.invokeServlet
(ServletStubImpl.java:265)
> [7] weblogic.servlet.internal.ServletStubImpl.invokeServlet
(ServletStubImpl.java:304)
> [8] weblogic.servlet.internal.ServletStubImpl.invokeServlet
(ServletStubImpl.java:200)
> [9] weblogic.servlet.internal.WebAppServletContext.invokeServlet
(WebAppServletContext.java:2,495)
> [10] weblogic.servlet.internal.ServletRequestImpl.execute
(ServletRequestImpl.java:2,204)
> [11] weblogic.kernel.ExecuteThread.execute (ExecuteThread.java:139)
> [12] weblogic.kernel.ExecuteThread.run (ExecuteThread.java:120)
> ExecuteThread: '14' for queue: 'default'[1]
>
> Bob Lee <[email protected]> wrote:
> > Thank you. Many times you can disable it for performance reasons. I
wanted
> > to make sure that this was not the case here for when my code goes to
> > production.
>
> > Bob
>
> > "Dimitri I. Rakitine" <[email protected]> wrote in message
> > news:[email protected]...
> >> Isn't it supposed to always try to perform reverse lookup? I do
> >> not think there are any configuration settings.
> >>
> >> Bob Lee <[email protected]> wrote:
> >> > How can I verify that ServletRequest.getRemoteHost() is working
> >> > (configuration-wise)?
> >>
> >> > Thanks,
> >> > Bob
> >>
> >> --
> >> Dimitri
>
> --
> Dimitri
-
Permissions to create Reverse Lookup Zones in DNS
What Active Directory permissions are needed to create Reverse Lookup Zones in DNS? My co-worker is getting an access denied error when completing the wizard for this and the zone is NOT created. He is a member of the "DnsAdmins" group and
he can create Forward Lookup Zones. We are running Server 2008 R2 SP1 on our Domain Controllers where DNS is running. Any ideas?Set permissions for the DnsAdmins group on the DomainDNSZones application partition. To do this, follow these steps:
Click Start, click Run, type Adsiedit.msc, and then click
OK.
In the task pane, right-click ADSI Edit, and then click
Connect to.
Under Connection Point, click Select or type a Distinguished Name or Naming Context, type the following, and then click
OK:
CN=MicrosoftDNS,DC= DomainDNSZones,DC=<var>Domain</var>,DC=<var>Domain_Extension</var>
In the task pane, locate and right-click CN=MicrosoftDNS,DC= DomainDNSZones,DC=<var>Domain</var>,DC=<var>Domain_Extension</var>, and then click
Properties.
Click the Security tab, and then click Advanced. The
Advanced Security Settings for MicrosoftDNS dialog box appears.
In the Permissions tab, click Add.
In the Enter the object name to select box, type DnsAdmins, and then click
Check Names to verify the name.
Click OK. The Permission Entry for Microsoft DNS dialog box appears.
In the Apply onto drop-down list, click This object only.
Click to select the Allow check box for the Full Control
permission, and then click OK.
In the Advanced Security Settings for MicrosoftDNS dialog box, click
Apply, and then click OK.
Click OK to close the properties dialog box for the DomainDNSZones application partition.
Close the ADSI Edit window.
Test whether you can create a new DNS zone now.
If you found this post helpful, please "Vote as Helpful". If it answered your question, remember to "Mark as Answer". MCSE,MSCITP-EA
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