OT: DNS Host record with an @ symbol

I have switched to the DNS hosted by my domain registrar
(Network
Solutions), and I am curious if these default "A" records are
necessary to
keep:
@ (None).domainname.org
* (All Others) .domainnamename.org
They are currently pointed to the same IP address as
domainname.org.

Hello,
please see http://support.microsoft.com/kb/2520155/en-us
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://msmvps.com/blogs/mweber/
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

Similar Messages

DNS Host Records Missing

Hi,
We are having an issue where DNS Host records seem to be missing, a user logs on and they don't get their group policies. They can logon again and get their group policies. However the DNS Host record is still not created on the DNS Servers.
If we reboot the PC the DNS record is created. What is going on.
We have 2 DC's running DNS, and one of them runs DHCP.

Hi,
According to your description, my understanding is that client does not registry record in DNS server when user logon. And the DNS record will be created after rebooting the client.
DNS updates can be sent for any of the following reasons or events:
1. An IP address is added, removed, or modified in the TCP/IP properties configuration for any one of the installed network connections.
2. An IP address lease changes or renews with the DHCP server any one of the installed network connections. For example, when the computer is started or if the
ipconfig /renew command is used.
3. The ipconfig /registerdns command is used to manually force a refresh of the client name registration in DNS.
4. At startup time, when the computer is turned on.
5. A member server is promoted to a domain controller.
A user logon behavior will not trigger DNS update/registry. You may Open CMD on client and type
ipconfig /registerdns command to manually force a refresh of the client name registration in DNS.
If I have any misunderstanding about your question, please correct.
Best Regards,
Eve Wang
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DHCP Reservation Sync and DNS Host record sync etc shown in IPAM GUI

Hello all,
I am aware of the scripts in the TechNet script center to sync DHCP leases etc to IPAM, however my question is about something else -
If you highlight an IP address (IP address inventory->select an IP), You can see fields that say: "DHCP reservation sync", "DNS PTR record sync" and "DNS host record sync" as below:
I was curious as to what these are for. Is there some built-in sync functionality for these that I perhaps have not enabled? (Don't see such options any where..)
thanks,
-Ravi

Hi Ravi ,
The three columns tell us the information of the synchronization between IPAM server and DNS server (or DHCP server) .
Here is the detailed guide for using IPAM :
Using the IPAM Client Console :
https://technet.microsoft.com/en-us/library/jj878351.aspx#inventory
IPAM can sync DNS and DHCP records .
The IPAM database is separate from DHCP and DNS servers on our network ,and full synchronization of hosts and IP addresses between IPAM and managed DNS or DHCP servers does not occur automatically
unless we have configured automated tasks to perform this synchronization .
For detailed information ,see
DNS and DHCP record synchronization chapter in the following link :
Multi-server Management :
https://technet.microsoft.com/en-us/library/jj878329.aspx
Best Regards,
Leo
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Can DNSServer Powershell module cmdlets be used to add a host record with a blank name? i.e. "(same as parent folder)"

Giving Add-DnsServerResourceRecordA a blank name yields an error (basically saying that the 'Name' parameter cannot be null or empty). In DNS Manager (dnsmgmt.msc)
adding such a host record yields a record with the same name as the parent folder, denoted by "(same as parent folder)" in the Name column.
Is there some flag I can pass to Add-DnsServerResourceRecordA to achieve the latter functionality? Is there some other way to achieve this in Powershell?
I currently have the line of PS below, and if $name="" I get the error.
Add-DnsServerResourceRecordA -IPv4Address $ip -ZoneName $zone -Name $name -ComputerName $dns

Thanks, Calin!
This could be added as an example here: http://technet.microsoft.com/en-us/library/jj649925.aspx
Now that I see your answer Example 6 looks like it was supposed to use -Name "." but part of the line is missing so it just looks broken instead.

DNS host records priority

Hi,
We are using EPM (Enterprise Project Management) in our organization.
We have to provide access to it from three different subnets:
Local
Organization1
Organization2
The DNS already added the host record for the local IP. Ex.: srvepm 192.168.0.1
Then we added two other host records for the other subnets.
Ex.: srvepm 192.168.10.1
and
srvepm 192.168.20.1
We have an alias to that server: epm (that is related to the srvepm server)
It works fine. But, some machines in our organization keeps getting the other IP addresses from the DNS and this is making the service unavailable for those machines.
What I did is unchecking the "Register this connection's addresses under networking settings.
But when the server was rebooted the three host records were erased and it keeps shuffling it to the machines.
Anyone knows a way to fix this problem or how can I set priority on host records so it doesn't makes that anymore?
Hope I was able to show my problem correctly.

Since the app is not AD aware, it's using Netmask prioritization. Here's more on it below - and sorry for all the links. It's a heavy topic with lots of factors governing it. If the app was AD aware, then we would create AD Sites, and let AD handle it.
DNS Subnet Priortization & DNS Round Robin
Published by Ace Fekay, MCT, MVP DS on May 29, 2010 at 3:14 PM 794 0
http://msmvps.com/blogs/acefekay/archive/2010/05/29/dns-and-subnet-priortization-amp-dns-round-robin.aspx
Technet Thread - "DNS issue : DHCP relay + VLANs + multiple AD Sites" 9/1/2011
(Heavily discusses Active Directory SITES (not "web" sites), subnet priortization and subnet bits and how it uses the longest network bits first)
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/ea03c013-7484-4a24-96be-d95219b69b3f
Technet Thread: "How to achieve different DNS reddirection according to the NIC the request came" 2/10/2012
Discusses the use of TMG/ISA/Proxy and multiple sites (not websites)
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/9b90cc25-1d13-40e1-ab7f-9ee684a73f8b
Technet Thread: "DNS Netmask Ordering" 5/17/2011
Discusses how Windows Vista and Windows Server 2008 follow RFC 3484 for destination IP address selection, which does not honor DNS round robin by default. However, this can be changed by a registry entry, including a link to Microsoft KB968920 that further
explains this.
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/32f820bf-b871-4b76-9c9b-12413e33801a
Windows Vista and Windows Server 2008 DNS clients do not honor DNS round robin by default:
http://support.microsoft.com//kb/968920
DNS Round Robin and Destination IP address selection
http://blogs.technet.com/b/networking/archive/2009/04/17/dns-round-robin-and-destination-ip-address-selection.aspx
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.

DNS host record

We recently successfully decommissioned a child domain. However, we have found a non-domain system which was referenced in the child domain DNS as a host record - xyz.child.root.com
Where can I add this host record in the root.com domain, so it can resolve to services contacting that name? The child domain no longer exists.
Thanks.

Hi,
What does a non-domain system record mean?
This host record seems
for a computer located in child domain. If this record is for a computer located in child domain, this record will not efficient.
To add a host record to root domain, you can create a new host record in the root domain and input the corresponding IP and record name for the new record.
Besides, after you decommissioned the child domain, you can run dcdiag /test:DNS to check the health of DNS.
Best Regards,
Erin

Bulk Import Static DNS Host Records?

I have a text file with the hostnames and IP addresses for a large group of new computers that should have a static host entries.
How can I import these into Server 2008 DNS without having to type them in one by one?

Hello,
You can achieve this using Powershell 3.0 if you have Windows Server 2012. Or you can install Powershell 3.0 on your Windows Server 2008 and perform the task. More information on:
DNS bulk host (A) records creation
Regards.
Mahdi Tehrani |
|
www.mahditehrani.ir
Please click on Propose As Answer or to mark this post as
and helpful for other people.
This posting is provided AS-IS with no warranties, and confers no rights.
How to query members of 'Local Administrators' group in all computers?

DNS Host record of a computer is deleted after you change the DNS server assignment

Hi All,
This is a critical bug in Windows 7/Windows 2008 and Windows 2008 R2. Is there any way to get rid of it? I am planning for for a deployment with new DNS server IPs.
Thank you.

Hello,
please see http://support.microsoft.com/kb/2520155/en-us
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://msmvps.com/blogs/mweber/
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

DNS record with 2 IPs

I am running a DNS server on a 10.6.6 box and want to add a 2nd IP to a DNS record on the LAN. The reason being is that I backup clients to a PresSTORE server onto tape. Some laptops are not always connected by ethernet so it would be handy to "drop back" to the wireless IP address. I have tried adding the 2nd (wireless) IP for a DNS entry but when pinging the client it only tries the 1st IP in the list. Reverse DNS points to both IPs. Is there a way of doing this?
Any help finding a solution would be greatly appreciated.
Cheers, Paul

This reeks of an IP subnet routing error, a DNS error, or of a firewall or connectivity issue.
No, No & No
DNS would not likely be my first stop here, if I do understand what you're up to. (And I'm not certain I do.)
OK this is as simple as I can think of asking... I have one DNS A Record for a client with 2 IP addresses, one IP for ethernet, other for wireless. Obviously they both can't have the same IP on the same subnet so if DNS lookup can't resolve to 1st IP, how can one force it to try resolving to 2nd before giving up with an error?
I guess the ethernet & wireless could have the same IP if they were both not active when both connected. But expecting the user to switch off wireless when the etherent cable is plugged in and switch back on when the cable is unplugged, for the same of simplicity of a network connection *+I think not+*.
Also with IPs in the A Record, I have found DNS always tries resolving to the higher of the 2 IPs first (192.168.1.35 before 192.168.1.36). Then if .36 is offline it won't try resolving to .35 again until the DNS cache has been flushed.
Are these using WiFi routers, or access points?
Simple Apple Extreme Base Station configured as a wireless access point.
Is there one IP subnet for all hosts irrespective of wired or wireless connection, or multiple subnets?
One IP subnet
Is there one DHCP server, or multiple DHCP servers?
One DHCP server
Is your PresSTORE box configured with static IP?
Static, not that is makes the slightest bit of difference.
By the look of it I am gonna have to wait until PresSTORE supports Bonjour!

Leopard DNS Server: Zones with SPF records?

Hi all,
I'm trying to figure out how to setup SPF (Sender Policy Framework) records for some domains I'm currently managing with a Leopard DNS server and I don't see any documentation anywhere. Can someone please tell me if it's even an option? I'm new to running DNS with Leopard, so I could use all the help I can get.
Sincerely,
Israel
Message was edited by: Israel Thompson
Message was edited by: Israel Thompson

Israel Thompson wrote:
So let me see if I have this right. Any changes I want to make that will not be editable in the GUI, I want to do them in db.mydomain.com instead of db.mydomain.com.zone.apple? Easy enough. However I tried adding "v=spf1 a mx ~all" (with quotes) to my file and it appeared to have broken the dns zone. What’s the proper way to enter these in manually? Can you give me an example of how it looks in your zone files? I’ve pasted a sample of mine below. Tell me if anything is wrong.
Israel,
I am new to Leopard Server - so I'm no DNS guru. I, too, have not used a DNS setup tool that requires a FQDN just associate an IP with the base of the domain (mydomain.com.). How did you get your 'mydomain.com. IN A 11.22.33.44' accomplished? Did you create a new A record and put mydomain.com. in the Machine Name field?
Here's my setup:
========================
db.mydomain.com
========================
;THE FOLLOWING INCLUDE WAS ADDED BY SERVER ADMIN. PLEASE DO NOT REMOVE.
$INCLUDE /var/named/zones/db.mydomain.com.zone.apple
========================
db.mydomain.com.zone.apple
========================
$TTL 10800
mydomain.com. IN SOA ns1.mydomain.com. admin.mydomain.com. (
2008010951 ;Serial
7200 ;Refresh
3600 ;Retry
604800 ;Expire
345600 ;Negative caching TTL
mydomain.com. IN NS ns1.mydomain.com.
mydomain.com. IN NS ns.mydomain.com.
mydomain.com. IN A 64.251.168.218
mydomain.com. IN TXT "v=spf1 ip:64.251.168.218 ip:64.251.168.220 ~all"
www IN A 64.251.168.218
mail.mydomain.com. IN A 64.251.168.220
mail.mydomain.com. IN TXT "v=spf1 a ~all"
xserve.mydomain.com. IN A 64.251.168.218
xserve.mydomain.com. IN TXT "v=spf1 a ~all"
ns IN A 64.251.168.218
ns1 IN A 64.251.168.220
mydomain.com. IN MX 10 mail.mydomain.com.
... where xserve.mydomain.com is my machine's hostname.
I have a funky setup for DNS because I don't have a different, or second, DNS server (just the one on my Xserve with everything else) and my name servers are under this zone. I added the two IPs for my mail and hostname to the base SPF record. Someone could still spoof from using the name or www domains (same IPs) but I can check for it using Postfix up front. I also added "v=spf1 a ~all" in case another mail server tries to check the mailing server or hostname directly.
You'll usually want to set a TXT "v=spf1 ~all" (SPF null) for any records that have no possibility for mail origins, like your ftp and mobile, but it appears you also have a similar issue to me - those services will be running under the same IPs as the mail service. This is why I added "v=spf1 a ~all" to all essential services (mail and hostname). I don't know what will happen if you add an SPF null to an unnecessary service that happens to also have the same IP. (Will the IP get blocked in a cache during a lookup??) So I didn't add an SPF TXT to those domains. I'm a little confused at this point. I should probably read more about it.
http://www.openspf.org/FAQ/Common_mistakes
Also, you'll notice I added FQDN to mail and xserve. If I do this and ensure they are in my reverse DNS PTR records then I've seen that when I add new zone records with same IPs (like for another domain) then the PTR records don't keep switching to the newest entry (why does it do that?).
I don't think your use of the . in the CNAME records is correct. I think the CNAME records are probably unnecessary since you have already fully defined the domains in A records. Also, those A records probably don't need FQDNs (with the ending .). I only added mine for the reason noted above, concerning the PTR records.
I hope someone who knows some more than I can chime in on this.
Larry
Message was edited by: Larry_S (removed mx from SPF TXT for main domain record, as it was redundant with the ip:)

SPA 5xx and 9xx phones registering to all proxies with DNS SRV records

A weird situation -- I use DNS SRV records to prioritize the two Asterisk servers to register to (east coast vs west coast). However it seems that phones are often registering to BOTH servers and show as live on both at the same time. There seems to be little rhyme or reason as to when it occurs, but it's weird. Fortunately the phone does seem to be preferring the higher priority SRV record but I can't figure out why it is registering to both.
This happens with SPA-942s (6.1.5a) and SPA504Gs (7.4.9c).
Any ideas what makes this happen? On the surface it seems like a good thing, but functionally the phones are registering the same port numbers and only the priority server can get through firewalls with traffic for the phones. This screws up my "presence" indicators within the system.
DNS SRV RECORDS:
_sip._udp.west.server.net (for west coast customers)
Priority 10: west coast machine
Priority 20: east coast machine
_sip._udp.east.server.net (for east coast customers)
Priority 10: east coast machine
Priority 20: west coast machine

We determined this was not actually happening. There was a syncing taking place in the background that was giving the impression this was happening but it really was not.

DNS "A" Record Preventing Networked Users from Seeing Own Website

I just set up a DNS "a" record in Server Admin to point "mail.xyz.com" to my server's internal ip (10.0.1.1).
I did this so users could stay on the network with sending and receiving mail, as opposing to going out onto the web to do so. (I have MX records on Network Solutions point "mail.xyz.com" to my server's external ip.) All of their mail clients list "mail.xyz.com" as the mail server, instead of the server's internal ip.
Trouble is, when users on the network try to access our website, "xyz.com," their browsers now return an error, saying they cannot find the server.
Any idea?
Lost count Mac OS X (10.4.9)

Steve and David --
This works. I am using Server Admin. To reiterate, I
added a zone "mysite.com" and a primary server "mail"
and pointed it at my server's internal ip so my users
can stay "inside" while checking mail.
Then, to follow your suggestion, I added a machine
named "www" to zone "mysite.com" pointed to my
server's external ip.
Some questions: How can I be sure the client's
machines are going interally to the server for mail?
(When I dig it in terminal, "mail.mysite.com" returns
an "a" record for the server's internal ip -- I
suppose that is sufficient.)
Yep!
Should the primary name server for the zone be "mail"
with "www" as an added machine, or vice versa?
The primary name server just identifies the machine which is responsible for holding records for that zone (domain). Add www as a 'machine' - think of each 'machine' as a specific IP address which identifies a host, hence IP / Name partnership. Any other hostname on same IP is an 'alias' (which becomes a CNAME record in the dns file).
You say I have to do this with "any record hosted in
my public dns as a mirror." I am running three
websites from my server, all with public dns pointed
at my server. (I use the same mail
server--mail.mysite.com--for all three.) Do I need to
set up a "www" record for each website? I have no
problem accessing the sites from internal client
machines.
the basic issue is that any zone (domain) defined in your own dns becomes 'authoritative' for that domain. So when clients ask your internal dns about any zone (domain) which is defined in it, and your server does not have that record, it will respond with "no such record" and your clients must take that on face value.
Therefore, you only need to mirror records for domains which you have defined in your own dns. If you have external www.domain1.com and www.domain2.com but only have domain1.com established on your internal dns, then you only need that domain's www record mirrored. Your server will therefore not be authoritative for domain2.com and will pass all requests out to whichever external dns is authoritative for it.
-david

Hostname/DNS "A Record" name

We are having an issue with one domain bellsouth.net we are basically getting this back from them.
12:18:29 928 MSG 10801 Recipient: [email protected]
12:18:30 888 DMN: MSG 10802 Send Failure: 521 Error - Blocked for abuse. Contact [email protected]
12:18:30 888 DMN: MSG 10802 Send Failure: 521 Error - Blocked for abuse. Contact [email protected]
12:18:59 480 MSG 10803 Analyzing result file: /media/nss/MAIL/ndhdom/wpgate/gwia/result/rae59395.645
12:18:59 480 MSG 10803 Detected error on SMTP command
12:18:59 480 MSG 10803 Command: bellsouth.net
12:18:59 480 MSG 10803 Response: 521 Error - Blocked for abuse. Contact [email protected]
When I looked up the Detected error on SMTP command, I found some information about the Hostname, currently on our server it is setup as Hostname/DNS "A Record" name: ndhc.org (according to the internet domain holder (godaddy) the host name is ndhc.org and the "A" record name is mail. What should we have in the Hostname/DNS "A Record" name field? I believe that we have tried the servername.domain name (liberxx.ndhc.org) and that failed and I think that we also tried (mail.ndhc.org) I cannot confirm that we actually have it has been awhile since we did this project, but I am just wondering if someone can help clear this up for me. Thank you. This issue only started happen with Bellsouth.net when we switched from the NetWare GWIA to the Linux GWIA is there something else that might have been missed.

Originally Posted by mrosen
Hi,
dschaldedfg wrote:
>
> We are having an issue with one domain bellsouth.net we are basically
> getting this back from them.
>
> 12:18:29 928 MSG 10801 Recipient: [email protected]
> 12:18:30 888 DMN: MSG 10802 Send Failure: 521 Error - Blocked for
> abuse. Contact [email protected].
> 12:18:30 888 DMN: MSG 10802 Send Failure: 521 Error - Blocked for
> abuse. Contact [email protected].
> 12:18:59 480 MSG 10803 Analyzing result file:
> /media/nss/MAIL/ndhdom/wpgate/gwia/result/rae59395.645
> 12:18:59 480 MSG 10803 Detected error on SMTP command
> 12:18:59 480 MSG 10803 Command: bellsouth.net
> 12:18:59 480 MSG 10803 Response: 521 Error - Blocked for abuse.
> Contact [email protected].
>
> When I looked up the Detected error on SMTP command, I found some
> information about the Hostname, currently on our server it is setup as
> Hostname/DNS "A Record" name: ndhc.org (according to the internet domain
> holder (godaddy) the host name is ndhc.org and the "A" record name is
> mail. What should we have in the Hostname/DNS "A Record" name field?
mail.ndhc.org
Okay, so you think we should try putting "mail.ndhc.org" into that section (Hostname/DNS "A Record" name field) instead of what we currently have "ndhc.org"
But that error doesn't sound like it's related to DNS. It much more
sounds like you're really blacklisted for sending spam. If it's really
the hostname, then their system is giving out extremely stupid result
messages. Have you tried to contact the given email address in the
message?
I know when we first setup the system we were having an issue with the GWIA relaying, but that has since been rectified, they are the only ones that are blacklisting us, because I have checked on other sites (blacklisting websites that is) and there is nothing about our site being blacklisted. I think basically the people that are trying to receive the messages respond back saying that they never received emails from the people here at ndhc. If memory serves they have been emailed from other accounts and those go through because Bellsouth.net is not blocking those accounts, like yahoo, gmail, etc.
CU,
Massimo Rosen
Novell Product Support Forum Sysop
No emails please!
Untitled Document

WebAuth redirect DNS Host not resolving

Hello,
I'm trying to get my WebAuth redirect for guest to resolve a hostname, not an IP address. If I delete the hostname information it redirect's fine to the IP address (but has a cert error). I'd like to have to redirect to a hostname so it will match the CN of the cert i've loaded on the controller. We're using OpenDNS for the public DNS so I cannot put an A Record on there associating 192.168.254.1 to washcoguest.co.washington.mn.us.
Right now when I connect to the SSID, it try's to direct me be cannot resolve the hostname and I get a page cannot be displayed.
Any help would be great.
Pete

Pete,
You can host that A record inside, but that would mean your guest need to have access to your inside DNS. Not ideal, but some people do that ...
Correct, you can host it with your ISP and it would need to match your domain. Which means you need a new cert.
For this very reason, I own "guestnetwork.org" and I host and provide certificates to get around all the confusion customers have. I can host XXXXXX.guestnetwork.org and its published in a few minutes and ready to go..
As for your NAT question. The Virtual IP should not be routable, which in your question its not, but just want to mention it. The client will need to reslove the name to the virtual IP. Adding all these extra steps only adds confusion.
I might suggest, redo the cert, publish it with yout ISP.

DNS Host pointing to an IP address of a host added to the domain

Hello
I have a server already joined to the domain, I need to migrate a file server, I want this file server host name to point to the actual server that is already joined to the domain. For some reason my company decided to create a host instead of using a DNS
Alias (CNAME),
Look like it is working fine, I can connect to the shares.
ServerA -> File server to migrate
ServerB -> Server to host the ServerA shares
But on some cases looks like authentication is failing for some applications,
Do you know if there is a Kerberos limitation? I am not sure if I should set a spn

Hi,
Could you share the error message with us?
I don’t think DNS CNAME record cause the problem as long as you have configured it properly.
In the meantime, you can do some troubleshoot the issue according to the articles.
Troubleshooting Kerberos Authentication problems – Name resolution issues
http://blogs.technet.com/b/askds/archive/2008/05/14/troubleshooting-kerberos-authentication-problems-name-resolution-issues.aspx
Kerberos authentication and troubleshooting delegation issues
http://support.microsoft.com/kb/907272
Hope this helps.

OT: DNS Host record with an @ symbol

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