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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Hi.  We haven't changed our network structure on the IBM I for years and only recently have a need to as all of our processes have been pretty much contained on the I.  I'm self taught in IBM maintenance and learning as I go but I think the changes I need to make are pretty benign but I need some advice.    

I noticed my host table is totally out of whack with my network so I need to remove and correct some entries.  I'm really thinking about only leaving those entries referencing my Virtual IP on the I and otherwise not using a host table.  Ultimately, I need to add some DNS entries and allow external resolution.  Currently my Host name search priority field under CHGTCPDMN is set to *LOCAL.  Is it necessary to change to *REMOTE to make DNS active?  Would this change require an IPL?   If I leave that setting at *LOCAL, Do I need to make a specific entry in my host table or will lookups query my host table and then automatically jump over to DNS for those  queries without a corresponding entry, provided I have the DNS server addresses listed?  
I guess my question(s) are, What is best practice in this case?   Do Host table changes or DNS changes require any service restarts or an IPL or can I just make these changes on the fly?
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Does anyone know why a Sophos firewall would suddenly stop providing proper DNS? We thought it was a Verizon issue, but the traceroutes I'm running stop at the firewall? I checked the DNS entries and they read like the Sophos site says they should.
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For a couple of weeks I am having an issue with out exchange 2013 servers.

we have two exchange 2013 CAS servers and two Exchange 2013 mailbox servers. email to the internet is routed through cisco IronPort located in the DMZ. emails to the partner domains is routed directly through wan links and there are connectors for the partner domains.

we are receiving complaints from users that mails are not being delivered from partners domain to out domain and the some users have provided evidence of that. but when we test emails seems to be going but with some delay. it looks like emails with attachments are having issues more that emails without attachments. some emails are missing and not all mails.

there seems to be some problem now since a few days that emails sent to Hotmail are going in spam and some times emails to domains like Gmail are not being delivered (Authentication errors).

there has been no change from our side and now we are having all these issues.

as far as the dns name registration is concerned we have mx records configured only without spf records and it has been like this since the beginning. and we had no issues. fixing the spf records is gonna take time as we have to go through the HO.

I have this issue and lots of tickets related to these issues. any suggestions highly appreciated.
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I have a developer that has asked me to create two DNS  entries,

ministry.undev.domain.org
schooladmin.undev.domain.org

I created them, but  they are not coming up when I ping them. Here's what my DNS manager looks like.

DNS
So the entry is created, as it's evident in the picture.
When I do a ping ministry.undev.domain.com I get the error "ping request could not find the host ministry.undev.domain.com. please check the name and try again"

When I do a ping undev.domain.com it works fine, I get replies

Is it because with DNS, it can only have one 2 periods, like xxxx.domain.com   or did I do something wrong?
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I have outlook 365 and am tyring to add a CNAME to my DNS to be used with Outlook 365 for DMARC and DKIM but I don't know what to put as the ALIAS.

My DNS is managed by Network Solutions, but they said that I need to know what ALIAS is to be used with Outlook 365.

Does anyone know what this could be.
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I have two 3750 switches that are connected and working but here is my only issues. By the way I am very new to networking so please excuse me being naïve .

My issue is when I have a machine on a different subnet other than the main one 10.46.72.x DNS does not resolve even though I manually add and with a DHCP scope that I removed will not work. Can someone please tell me what  am doing wrong. Here is a copy of the config

[code][/

User Access Verification

Password:
Base-sw1>show running
Base-sw1>en
Base-sw1>enable
Password:
Base-sw1#sh ru
Base-sw1#sh running-config
Building configuration...

Current configuration : 3753 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Base-sw1
!
enable secret 5 $1$lwLf$CJoNDGBl4Ck6AAm/woBVM0
enable password secret cisco
!
no aaa new-model
switch 6 provision ws-c3750g-24ts
system mtu routing 1500
ip subnet-zero
ip routing
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface GigabitEthernet6/0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet6/0/2
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet6/0/3
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet6/0/4
 switchport trunk encapsulation dot1q…
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How do I Move Godaddy account domain to another Godaddy account

[ Move Godaddy account domain to another Godaddy account ]

Issue is with finding "Domain Settings page"

1. Click a domain name on the list to go to it's Domain Settings page. [ Where is this Page? ]

2. On the Domains Settings page, below Additional Settings, click Transfer domain to another GoDaddy account.

3. The Begin Account Change window will appear
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Hello,

I am not sure if I interpret this correctly but this security report seems to show a few workstations have some suspicious DNS activities and trying to resolve some DGA domain - please see the attached.  

I am not in the security area.  Someone who knows how to handle please advise.  

Many thanks.
mysecrpt.png
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I do not have an issue but was wondering if you guys can list out some projects, problems or tricks you have done with Window DNS. I am trying to become more stronger in this area. I have a few but was trying to add to this.

Round robin DNS---Good for load balancing
Alias -- have used for a very long server name to shorten this for ease of use.
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We're creating a DR location and i have a question about email. We currently use O365 along with a hybrid on-prem Exch 2013 mail server where we create onprem users/mbxs and then migrate to O365 cloud. We use onprem ADFS to auth. This setup is current and will not change at current production site. (wasn't involved in design but it will remain)

In the event of DR scenario, i will redirect external STS DNS A record to now point to DR location (as well as create an internal STS for DR site) to work with DR onprem ADFS server (we will use DR location ADFS, not Azure in cloud) to authenticate users. This part i believe is correct.

My question is the external and internal autodiscovery DNS A record. I know this is used for initial user Outlook setup, but i don't plan to be ready to make new users in the event of DR scenario. Only planning for short duration at DR location before moving back. (perhaps optimistic :) but this is the plan)

I will not have a hybrid server at the DR location. So - I don't need the autodiscovery DNS A external and internal record as it will have nothing to point to, and is not then needed for this temporary time, correct?  Am i wrong?  and if so - what's the autodiscovery purpose at a temp DR location and what would it point to without a hybrid server at DR?

Any link to confirming information would also be appreciated. Thanks guys/girls!
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I need to add a spf record to avoid spoofing and I use register.com as dns provider. They told me to add the following into the txt record.

@     "v=spf1 include:spf.registeredsite.com ~all"

I did that. When I sent a test mail to my gmail account, the mail went through but the header showed me it is has a softfail and the error message is as following:

pf=softfail (google.com: domain of transitioning me@mysite.com does not designate 192.168.0.1 as permitted sender) smtp.mailfrom= me@mysite.com;

For your information, my A record is the following:

*.mysite.com        10.10.0.1     <- webserver
mail.mysite.com      192.168.0.1   <- emailserver

Note: Please pardon the email address and ip addresses in this post are not real for security reason.
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So we were using a Local Exchange server with the domain of 123abc.com. Our local AD domain name is 123abc.local. We have decided to move all the email accounts to Office 365 under a new domain name of 456abc.com. That portion of the project went good, set up the office 365 mail server migrated the email over to office 365, added the original domain of 123abc.com to the new office 365 account as an allis domain and added all the old emails test@123abc.com as an alias email to the Office 365 email. I have also gone thru and set up the outlook clients to use the new domain and everything is working fine. The issue is now that everything is on office 365 I shut down the local exchange server and now some of my users are getting a mail cert error. Certificate Error
I have found that if I go in and follow these instructions and add the exclude SCP object check, outlook no longer throws up the error. The issue I have is I have over 50 machines and I know I can export the reg and import into other computers, but there has to be an underlying issue and a way to fix it without having to import reg on every machine.

https://kb.intermedia.net/article/2445

Also, anything anyone can recommend that I can read about decommissioning a 2010 exchange server on a local domain? I think I would need to remove it from the domain but what else should I remove?
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I'm having issues with certain addresses resolving to an internal IP address when I don't think they they should.

We are running Windows 2016 Active Directory/DNS and have our domain zone record hosted with the same company who host our website.

Our AD domain is ad.company.com and the website is www.company.com. This works fine and requests from both internal and external all resolve to our host and we can see the website.

We host an internal ftp/web server with A records set up at the external company for ftp.company.com and company-webservices.com, both of these are set to point to the external IP of the web/ftp server. External requests to either of these work correctly and customers can see the ftp and web server.

What doesn't work is requests from the LAN. These resolve to the internal IP of the ftp/webserver.

I could possibly understand this for ftp.company.com but not for company-webservices.com as that is completely unrelated to our AD domain.

How do I go about fixing this so that LAN requests to ftp.company.com and company-webservices.com resolve to the external IP of the server?

thanks.
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How do I recover ownership of expired whois.godaddy.com domain name

Domain Name schoolforthearts.org is owned by me (Jim Lacey of  as  JAMAR Associates)  as of 11/27/2016 as listed in ICANN WHOIS.

Domain Name: SCHOOLFORTHEARTS.ORG
Registry Domain ID: D103541157-LROR
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com 
Updated Date: 2010-11-17T19:08:48Z
Creation Date: 2003-12-23T23:51:04Z
Registrar Registration Expiration Date: 2018-12-23T23:51:04Z

This domain was listed by GoDaddy as Parked for Free - but now seems to be for sale, apparently because of earlier expiration date.

Current user of this domain needs resolution as customers cannot access website, domain listed as 'parked for free, courtesy of GoDaddy'.
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I have a vm running 2008 server (not R2) that is a primary domain controller and DNS server.   I have 2 vm's now running server 2016 (server2016-dc1 and server2016-dc2). I would like to make DC1 the primary domain controller the demote the 2008 server to a member server.  After that is done DC2 (2016 server) will become backup DC and DNS.  

Is there a good document that will help me step through this?  Also, do I have run adprep on the 2008 server first?  I read something somewhere that indicated that 2016 does this for you.
Servers_temp.png
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Upgrading from Exchange 2010 to Exchange 2016. Everything is connected and communicating. However, whenever we point the external interface to the Exchange 2016 server, Outlook anywhere for any mailbox on the 2010 server fails to connect. OWA and Activesync works just fine. Internal connectivity is fine. Just Outlook Anywhere. I have gone through the co-exist configuration, setting Outlook Anywhere to an external mail.crestoperations.com, which is my external DNS to our NAT firewall (the only thing I change is the NAT pointer). I have configured Outlook Anywhere on the 2016 server to use NTLM. I have configured IIS on the 2010 server to use both basic and NTLM. Any advise on configuration would be appreciated.
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I  am now working for a company that has 2 external dns servers and no one knows what maybe using them if anything anymore.
Just wondering what is the best way or easiest way for me to find out what is using these 2 external dns servers?
Thanks in advanced.
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URL Masking

I am reselling an online product and using my own brand name (all contracts with product provider in place).

They have an Outlook Web Access url which lets say is https://supplier.co.uk/owa. Now, I want to have my own domain for the same but so that my clients don't ever know they are using the suppliers URL. So something like https://owa.rebrandedname.co.uk or https://www.rebrandedname.co.uk/owa

How can i achieve that without redirect all traffic for all pages to www.rebrandedname.co.uk
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We have a user that works at two locations. He is running Windows 10.
At location 1 he has DHCP with the DNS IP addresses he needs.
At location 2 we need to manually set static DNS for him to access some crucial applications.
We don't just leave the static DNS IPs on because this affects his normal internet access when at home or elsewhere.

I would would like to setup two command files (.CMD) that will change the DNS settings for his NIC per location.
 - Command file 1 - DHCP DNS
 - Command file 2 - Static DNS

What command line can I use to do this?

T.I.A
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Just cleaning out my DNS and I see this greyed out local subfolder. It has a NS record that shows an old DC that has not been in use for awhile. Is it safe to delete?
Please see picture.

Thank you.
dns_greyed_out_folder.PNG
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Ok so im trying to understand how i can mask my domain name across different web hosts.

So my setup is as follows:

Godaddy hosts my domain name: example.com
Example.com name servers are set to digital ocean
example.com website is hosted on digital ocean
My app for example.com is hosted on azure at example.azurewebsites.net
I want to create some links from example.com to example.azurewebsites.net but mask the domain name so users dont think they are leaving example.com

Is this possible? I assume i need to do something with DNS records and then something on the webserver for example.azurewebsites.net ?
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I applied windows updates to two servers this afternoon.  Tonight I am getting complaints about accessing domain resources.  

If I do a nslookup google.com   it responds with the correct address.   If I do a nslookup fs-server-01  i get   *** DS-Server-01.vs.mydom.com can't find fs-server-01: Non-Existent domain.    

I have added a domain suffix in dns settings and this was working earlier today.   I have restarted DNS on both DNS Servers.  (DS-Server-01 and 02).  Both servers are running Windows 2016 Standard

Has anyone had similar issues?
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Joining remote server to the Domain.  What the DNS should be on the joining server?  Local or remote domain that I am trying to join?
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When this client connects to our Public guest WiFi her browser doesn't load. it comes up blank and she's not able to connect. It used to work. I had to delete the the public wifi during a large conference and then re-created after the conference. Ever since i recreated it she's not able to connect. I've not had another problems with any other devices. Her Kindle Fire version is 6.3.4_user_4120720. I don't have access to her device but if you could give me a couple ideas that would be great.

Is there a way to "Forget" the SSID or clear DNS on the Kindle Fire? any ideas would be most appreciated

I've opened a ticket with Ruckus support but that's not going to help me tomorrow (Sunday) when she'll try to connect again.
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Does anyone know if there is a way to direct a certain DNS query toward one DNS server and the rest at the default DNS server of the NIC's card? For example, say I want a dns query of www.xxx.com to go DNS server 1.1.1.1 and the rest go to 4.2.2.2 (which is what the workstation's NIC setting is set at).

Thank you!
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DNS

26K

Solutions

26K

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.