DNS

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The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

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I did some research studies and have the  following questions.

My environment is  Windows  10, Visual Studio  2015....

Project description : DNS RESOLVER IMPLEMENTED AS A WINDOWS SERVICE (MAIN FEATURE INTERCEPTION AND REDIRECTION  TO ANOTHER HOSTED DNS SERVER)

The scenario of my laboratory research  work is this : My research laboratory has one hundred work stations, with users on each system. My research work is centered on  making  users  Web browsers (opera and Firefox and e.t.c)  queries i.e  web surfing ,  to be intercepted and redirected to a local hosted DNS SERVER which will communicate  with top level domain name servers around the world and return the request  back to the users. The solution  is to be design as  a WINDOWS SERVICE (not a GUI).  


From reading a "legacy driver" -  A legacy driver is used for driver project  whose main goal is Driver service which is a type of kernel-level filter driver implemented as a Windows service , or a non-PnP .


My question is this can i achieve  a DNS RESOLVER IMPLEMENTED AS A WINDOWS SERVICE (MAIN FEATURE INTERCEPTION AND REDIRECTION  TO ANOTHER HOSTED DNS SERVER) drive for DNS web browsers queries Interception and  Redirection.
 

Just wondering Looking at https://github.com/Microsoft/Windows-driver-samples/tree/master/network/trans/inspect, "he sample driver consists of a
 kernel-mode Windows Filtering Platform (WFP) callout driver (Inspect.sys) that intercepts all transport layer traffic (for example,…
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Dear Experts,

Recently, I ran some disk cleaning on the server, and after reboot, it failed to get to the log in screen. ( Hung at "Applying Computer Settings" for hours.)  After doing some Googling, I booted the server to Safe mode, and changed all Exchange services to Automatic (Delayed Start), and got it to boot.  Now I cannot connect to Exchange server.  (MS Exchange Server 2010 running on Windows Server 2008 R2 Service Pack 1)

I have manually started all of the Exchange services, however, I cannot get Exchange Transport, Exchange System Attendant,  and Information Store to start.  They will say Starting, and it stays there.  Service Host will error out saying The service did not respond to the start or control request in a timely fashion.

I looked into Event Viewer and am getting "Unhandled Exception "The Microsoft Exchange Active Directory Topology service on server localhost did not return any suitable domain controllers." error every minute.
My DC is the same server, and AD works fine, so I do not know what the issue is at this point.

Please advise.
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I have a xcompany.com website hosted on cloudflare external dns and it resolves to company website. Now I am trying I have registered a certificate for Synology file server for faster access without VPN with port (https) on a reserved external IP different from of NAT and gateway ip.

Synology documentation suggests creating CNAME but cname record on DNS with san.xcompany.com is going to resolve to xcompany.dom website instead of san.xcompany.com file server on https.
What are the additional steps to make https file browsing from outside network successful in DNS? By the way I have already registered certificate with san.xcompany.com
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Is it possible, via batch/vbscript/powershell to read or view the results of the monitoring tests from the Windows DNS applet?  Referring to the section where you can do a simple and/or recursive test and get a pass or fail for each test.  Is there a way - OTHER than from inside that window - to view the results of those tests?  I have scoured event logs and everywhere else I can think to look, but have not found where the OS stores those results.
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Good Day,

Got a question which I am not sure about.

I got a Server 2012 Hyper V Host running 3 Virtual servers
6 NICS and 2 NIC Teams

Virtual Servers:

ServerA- DHCP DNS DC
ServerB
ServerC

ServerA has one virtual NIC and it is statically assigned IP address. IPv6 on this nic is disabled.

However on the DNS there are 3 entries showing for this server.

1. ServerA - Host(A)  10.11.1.12  static  ( This is the static one on the only nic on this server )
2. ServerA - Host(A) 10.11.1.115 static ( Not sure where this is coming from. I tried deleting it and it comes back after some time. ?? )
3. Server A  IPv6 Host (AAAA)  - long mac address - 8/12/2017 11 PM


Shouldn't there be only 1 entry ?  

The same issue is with couple of other severs. Either my concepts are not clear or it is something weird.

Thanks
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Hi,

I have a Ubuntu webserver on amazon running Apache and I want the site to be able to send emails.
I have installed and configured postfix, and it works... apart from email always going to spam.

I understand that if I create a SPF DNS record i can reduce the chance of it going into spam... and also reduce stop spammers from spoofing your domain.

I don't quite understand how the record works... could someone help......

Example:
Server Hostname: example.uk
Emails get from from server@example.uk

DNS Records on 123reg
@ A Record 12.34.56.78 (external ip)

Emails will only be sent from server@example.uk

Can someone help create a SPF Record.

Thanks

Steve
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I will be migrating a Google Gmail email domain to Office 365.

I have gone through and completed all the required steps as documented on the Migration Wiz website to do this.

I have created the required TXT record within this company's external DNS provider (asmallorange.com) and have been told by the Office 365 domain wizard that I need to add the records shown in the screenshot to our external DNS provider (asmallorange.com).

Is it possible for me to add these records to our external DNS provider (asmallorange.com) while leaving the existing records for Gmail in place?

I want emails to continue to go to user's email accounts within Gmail. The only thing I want to do now is to finish the domain verification of the domain name that is currently being used by Google/Gmail so I can then use the migrationwiz.com website to migrate the email from the Gmail servers to the Office 365 servers.

Then once this migration has completed I will replace the external DNS Gmail email records with the Office 365 DNS records shown in the screenshot and will create new Outlook profiles for all users so Outlook will connect to the Office 365 servers for email.

What I need to do now is to finish the email domain verification within Office 365 so I can then perform the migration wiz migrations (while we coninue to use Gmail as our email service provider--but I don't want to interrupt any future emails from arriving at the Gmail servers until I officially cut the online DNS …
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Spun up a DC too fast.  Wonder now how to change a DNS Domain name from domain.local to domain.com and also a NetBIOS name.  
Worth the stretch or easier just to wipe and reinstall?
DC Win2016 Server Standard.
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Trying to deploy an AD and cannot use the NetBIOS name that I want.  Saying same already exist.  
How can it be if we do not have any domain?
Can it be conflicting with a machine name someone name as such?
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Hi all. Anyone got any ideas about how best to look at 2 Domain Controllers and compare them for configuration?

So something that views LDAP policy, DNS resource weight and priority, a tool perhaps that makes comparisons and spots differences? Or maybe nothing like this exists?
Thanks all
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Currently, we migrate our local Active Directory into a large Active Directory structure of our data provider. Sometimes our workstations show strange problems (Explorer.exe crashing, resources unavailable etc.). We found out that those problems don't occur if we put our domain name with an IP address of an available DC in c:\windows\drivers\etc.hosts.

Using Wireshark we found out, that some DNS-queries on DCs were not answered. The clients kept on sending packets on port 53/DNS which were not answered. Just pinging them is possible. The firewall of our data provider just drops IP packets on unavailable ports instead of denying them.

nslookup my.domain.com
   Addresses: 1.1.1.1 (only ping, everything else dropped)
                        2.2.2.2 (only ping, everything else dropped)
                        3.3.3.3 (port 53 available)
                        4.4.4.4 (only ping, everything else dropped)

I would like to convince our data provider, that DCs in the round robin list of the AD domain should either be completely available for AD relevant protocols or otherwise be completely unavailable, so that workstations contact other DCs.

Am I right with this assumption? Is there a whitepaper concerning the availability of DCs in the round robin DNS list of an AD domain name?

Best regards!
Chris
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My Question is, do I need port 443 for legacy.Domain.com to point to the exchange 2007 server if the users do not use OWA, during the migration of 2007 to 2013 Exchange?
 Offsite users are configured for Outlook anywhere, and I am not sure if that uses port 443.
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What are the exact steps to lookup which company hosts a company's external DNS records?

I will be migrating a company from a corporate Gmail account to Office 365. Currently no one knows which company is being used to host this company's external DNS records. I will need to change these external DNS records to point to the Office 365 servers to successfully complete the migration from Gmail to Office 365.

I'm already familiar with using websites like MXtoolbox.com but where within MXtoolbox.com or other websites can I determine exactly which external DNS provider hosts a company's external DNS records including the MX records?
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There are about 20 users on our SBS 2003 domain. None of them can reach a certain website (www.cleaneasier.com) from their local machines. They were able to access the website a few hours ago. They receive an error from the browser of" www.cleaneasier.com’s server DNS address could not be found.
ERR_NAME_NOT_RESOLVED"
 I assume it's an internal DNS issue but I do not see anything configured for that domain is the SBS 2003 DNS settings. Can anyone give me pointers on torubleshooting this issue. I have verified the site is up, can reach it from outside the network fine.

Nothing is configured in forward or reverse lookup zones for the cleaneasier.com domain and no changes (that I am aware of) have been made to our servers DNS settings recently.
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we've got a 2008 R2 domain with an RODC deployed in a DMZ and servers wihtin the DMZ connect to this server for authentication, DNS etc.

Recently, we deployed new group policies on the domain, and i noticed the DMZ servers were not receiving these changes.  a quick check of the RODC shows it is unable to receive the updated GPOs (even after a gpupdate /force it reports an error).  In the event log I am seeing multiple event ID 64 about expired certificates, plus Event Ids 6 and 13 regarding failed certificate enrollment and "RPC Unavailable" errors.  nothing has changed with regards to the FW rules recently to cause this.

Opening the FW to allow all traffic between the Root DC and the RODC has resulted in everything now working again, certificates have updates and all new GPOs have been received and a gpupdate now reports successful completion.

I've opened up all the required ports as detailed in the microsoft documents, and assigned two static ports to replace the dynamic port ranges (again as detailed in MS documentation).  Clearly I can't leave all traffic enabled, but am a loss to what i am missing which is causing this failure?
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I went to a doctor office and used their wifi -- only to find I was able to get on internet but not able to get connected to my office vpn. Further investigation found my domain name was totally resolved into a wrong IP. And that's it -- I was done and not able to do any work. My question to you... is there any command I can issue to force that DNS to 'renew' or reload its DNS records so I can get resolved into a correct IP ?
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Need another pair of eyes to check my DC specs.  Mostly for AD purposes box.  DC, DHCP, DNS.  Maybe Print server as additional.  I will dial another DC on VM.  

Win2016 DC
FT-E5-2603V4, Intel Xeon E5-2603V4 1.7GHz 1U
Including:
* (1) Intel Xeon Processor E5-2603V4 Haswell (6 Cores)
* (1) Supermicro Motherboard X10SRW-F
* On Board Dual 1GB NIC Ports
* On Board VGA
* On Board IPMI 2.0
* 16GB DDR4 2400 RAM ECC/REG Installed, Lifetime
Warranty
* (1) Riser Card w/ 2x PCIe x16 GEN 3.0 FHFL
* (1) Riser Card w/ 1x PCIe x8 GEN 3.0 LPHL
* (1) LSI 9271-4i RAID Controller
* (2) 1TB Enterprise SATA 7200RPM 3.5" HDD
* (4) Hard drive Bays for 3.5" or 2.5" as an option
* (2) PCI-e 16X GEN 3 Slots available
* (2) 500W Hotswap redundant PSU
* (1) Microsoft Windows Server 2016 Standard Operating System
64-bit English (16 Core), OEM
* 3 Years Full Warranty w/ advance ship replacement
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Greetings,

I have two servers with two public IP addresses.  Our main site is on one public IP, All subdomain sites are on the second IP.  The primary site is SSL certified for https  operations, the others are plain http, and have no interest in going into https.

Our issue is cloudflare.  our domain is parked at cloudflare cdns.  I need cloudflare to be the cdn for all sites.  however, if I turn on SSL at the primary site, in cloudflare, it works, but all the http sites on IP2 fail.  If I turn off https/SSL on cloudflare, all of the http sites fire up, but the primary site fails.  

Our only solution was to turn off SSL, and turn cloudflare into dns only to support both.  This, IMHO, denies the reason for having cloudflare in the first place.

is there a way to tell cloudflare to SSL the primary site, and not start a SSL handshake for the other A lines in DNS?

Thanks.
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How would you troubleshoot DNS broken delegations?
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In Windows DNS we have a static record for a server name and its IP.
Does the server then need to have the "Register this connection's addresses in DNS" checkbox cleared?
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I added new ADC win 2016 to Win 2008 R2 DC. both DFL & FFL win 2008. I migrated frs to DFRD.. everything is working fine. But DNS forward lookup zone is not replicated where as reverse lookup zone is present in win2016 ADC... please let me know what should be the issue.

thanks
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We have a client who can not get an email, I have sent test emails and they throw codes below.

They are using Network Solutions for DNS, and Google Email hosting - not the paid version 10 users, the user can send me emails and I receive them but when I reply I get this message. I have also checked to see if the IP is blacklisted - seems fine.

The response from the remote server was:
550 5.0.0 <user@email.com>... User unknown


Final-Recipient: rfc822; user@email.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; inbound.email.com.anotherdns.net. (8.8.8.8,
 the server for the domain email.com.)
Diagnostic-Code: smtp; 550 5.0.0 <user@email.com>... User unknown
Last-Attempt-Date: Fri, 04 Aug 2017 18:45:44 -0700 (PDT)
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Say, No-IP is no longer allowing users to use the No-IP.org domain. Is there a way to get access to this domain? I have several modems created with this domain and have lost connectivity to their DDNSes.
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Hello, my only domain controller's DNS database is corrupt and active directory status says expired. I cannot add a computer or another DC to the domain because I get an error that active directory is unavailable. What are my options to fix this issue?
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I have a RRA server (2008 r2) and it's handling my VPN connections.  My users are on Win10 and when they set up a VPN connection, they connect just fine and they get a correct IP address, BUT, they can't resolve DNS.  They can't map drives using \\mapping and they can't ping anything.

I'm not sure where to look to resolve this.

Can someone assist?

Thanks

Cliff

PS:  The machines connecting DO get an IP address from the internal DHCP server and when I do an ifconfig /all, I see the DNS servers listed in the VPN NIC properties.

Also, I just saw that I can ping the domain controller, at least one of them, but not the other one.
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DNS

25K

Solutions

25K

Contributors

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.