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• Is it bad to have the Reverse DNS for two IPs point to the same domain name?

  - by Daniel Vandersluis

  I am in the process of setting up a new server for my domain (the site will be moved, it is not for load balancing or the like), which has a different IP address from my existing server. My current server has a reverse DNS PTR record set up pointing its IP to mydomain.com. Is it bad to set up a reverse DNS PTR record for the new IP pointing to mydomain.com as well? Or should I wait until I do my migration to set up the record?

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• Problem with DNS

  - by dotNET

  Hey, I bought a new website, and the company gived me another free domain name, so when I asked for the socond they created it and they told me to change the DNS to look like the first one. It's been a week waiting for it to propagate, today when I type the url I got this error message : If you are the web site owner, it is possible you have reached this page because: * The IP address has changed. * There has been a server misconfiguration. * The site may have been moved to a different server. If you are the owner of this website and were not expecting to see this page, please contact your hosting provider. When I try to add the second domain to my cpanel (Addon domain) I get also another error : The addon domain “abcdef.com” has been created. An account with that login already exists. Do you have any ideas about this problem. Thanks. EDIT I tried to flush the DNS with ipconfig /flushdns, but It's not changing anything.

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• DNS add-on domain setup and redirect

  - by brian

  I have several domains which I'd like to point to another (I'll call it foo.com). A couple of things aren't entirely clear to me. First, the DNS. I'm using Kloxo/HyperVM. Do I need to create separate DNS entries for each domain? Or do I just create separate CNAME or other records under foo.com? I thought it was the latter but when I click on "Add CNAME" I'm prompted to fill in the subdomain portion of foo.com. The nameservers have already been set to point to my VPS. For the redirect, would the following be appropriate within the vhost conf for foo.com? ServerName www.foo.com ServerAlias foo.com foo.net foo.org bar.com bar.net bar.org RewriteCond %{HTTP_HOST} ^foo.com [NC] RewriteCond %{HTTP_HOST} *foo.net [NC,OR] RewriteCond %{HTTP_HOST} *foo.org [NC,OR] RewriteCond %{HTTP_HOST} *bar.com [NC,OR] RewriteCond %{HTTP_HOST} *bar.net [NC,OR] RewriteCond %{HTTP_HOST} *bar.org [NC] RewriteRule ^(.*)$ http://www.foo.com/$1 [R=301,NC] (The first condition is just to force the "www" part)

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• dns hosting - url forwarding - hiding forwarded url?

  - by jeremycollins

  I have free dns hosting with the domain registrar and I'd like the dns hosted domain www.example.com to display contents of www.myotherlongdomain.com. I only have 301/302/iframe forwarding options, however I want to mask the redirected (longdomain) url. If I use frames, users can view the source and see the (longdomain) url the contents are coming from. How can I hide it so it always displays www.example.com? There is no cloaking/masking option with the registrar. Thanks.

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• DNS question and Google PageRank from domains

  - by Beck

  I'm not so good at dns at all :) Just basics. A while ago i have noticed, that my blog have different Page Ranks, PR 3 for domain www.example.com and PR 1 for domain example.com. In dns records i have this setup: A - IP - www.example.com A - same IP - example.com Should i replace this record "A - same IP - example.com" with row with CNAME instead of A? Like that: CNAME - same IP - example.com - alias www.example.com Will this combine Page Rank value of both domains? Or i can just create 302 redirection inside .htaccess file, verify example.com(without www) inside Google Webmaster Tools as my domain and inside www.example.com options set as main domain? Thanks ;)

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• DNS records: make mydomain.com work without www

  - by brentonstrine

  I am trying to configure DNS on my domain, however, I can only get it to work with the www prefix. Right now I have the following DNS A records: @ A 123.456.789 www A 123.456.789 http://www.mydomain.com works perfectly. But http://mydomain.com fails. I've tried all of the following: mydomain.com A 123.456.789 mydomain A 123.456.789 * A 123.456.789 But it always goes to port :80 requires a username and password. Except now it's somehow being redirected to a spammers website.

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• The concept of virtual host and DNS

  - by Subhransu

  I have a dedicated server and a mydomain.com (bought from a hosting company). I want to host a website from my dedicated server with the domain mydomain.com i.e. when I enter mydomain.com from browser it should point to the IP(let's say X.X.X.X) of dedicated server(and a particular folder inside it). I have some following queries: In Server I know I need to edit some of the files (like: host or hostname file) in the server but I do not know what exact file I need to edit. How to add a Site enable or Site available in apache2 ? In Hosting Company control Panel Which records to add (A or cname or anyother)? Where Should I add DNS(in dedicated server section or domain name section)? How it is going to affect the behaviour of the domain? in short the question is: How the virtual host works & how to add DNS?

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• Confirm that a dns zone is served by a nameserver

  - by adam

  We currently have a domain which has custom nameservers. Our host has their own nameservers. I'd like to switch our domain to use our host's nameservers for a while. Our host tells me that their nameservers hold a replica of our dns zone, but I'd like to confirm this before I switch. Is there a command line tool I can use that I can use to answer the question "does this nameserver know the dns zone of this domain?" Hope that makes sense! Thanks, Adam

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• Is this a DNS or server-side error?

  - by joshlfisher

  I am having difficulty accessing a specific website. (I get 500 Server fault errors) I can access this site on my iPhone when NOT connected to WiFi. I CANNOT access the site when connected to WiFi or via a Ethernet connection to my home network. I thought it might be a DNS issue, so I copied the DNSservers from a friend who has a different ISP, and has no problem access the site. No luck. Also tried some of the public DNS servers out there, again, with no luck. Does anyone have any idea on how to trace this issue?

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• DNS configuration to force root domain to www

  - by kolosy

  we have an app running on heroku. the dns setup is like this: A record for domain.com - heroku front end ip addresses CNAME for www.domain.com - specific host name for our app provided by heroku we also have an SSL cert for www.domain.com. the issue is that if someone goes to https://domain.com/secure_stuff, they will get heroku's SSL cert, instead of ours, causing lots of fear. We can do things on our end to make sure that all of our URLs point to https://www.domain.com, but it still won't solve this specific issue. is there a way to configure the DNS record to redirect all root domain traffic to the www subdomain?

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• CloudFlare DNS: Downtime failover host

  - by Dr. McKay

  My company uses CloudFlare for its DNS, but as our site is HTTPS-secured and we're on the free plan, we can't utilize CloudFlare's CDN services. Our host has fairly rare but not insignificant downtime. We can't migrate servers just yet, and I'd like to be able to either have the main domain redirect to the status domain, or simply resolve to the alternative status host in the event of downtime so users will stop bugging me asking if the site is down. Is this possible to do automatically using the free CloudFlare plan, or will I have to manually edit my DNS every time the site goes down?

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• Move website from host a to host b without down time dns change

  - by grigione

  I would like to move my website from host A to host B I have uploaded a copy of my site to the new host, while keeping the old copy in place with the old host I will need to update the nameservers to point to the new nameservers. I'll want to change the DNS settings of domain name to point to new host b To avoid down time for the DNS change to propagate through the net, can I add the old nameservers and new nameservers together without causing problems, or must I delete the old nameservers first? What happens to my website when it points to two different nameservers?

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• Local DNS server (bind) and the router DHCP

  - by Luca

  I just set up an internal http server for internal use (I set up Redmine), in a small network (30 or so PCs). I set up the http server on a virtual box ubuntu, that runs also the DNS server (bind). In the DNS lookup I added the Redmine server name (redmine.engserver <- 192.168.1.14) and as forwarders the outside ISP DNS IP adresses. I am using a small wi-fi router (ASUS RT-N66U) as DHCP (and as gateway). In the DHCP config page I set up as DNS the ubuntu server IP (it is fixed 192.168.1.14). Now when I connect a new PC to the network, the DHCP router issues its new IP and as DNS servers it issues: primary: 192.168.1.14 (ubuntu machine) and seconary 192.168.1.1 (the router itself). ipconfig /all Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DHCPv6 IAID . . . . . . . . . . . : 248539109 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-15-AA-3F-D0-67-E5-49-A7-EF DNS Servers . . . . . . . . . . . : 192.168.1.14 192.168.1.1 NetBIOS over Tcpip. . . . . . . . : Enabled Before changing the DHCP setting on the router, I would always get only one DNS server: 192.168.1.1 (which uses probably DNS forwarding to external public DNS services). The problem is this: If in my browser I type www.google.com, it works all the time. If in the browser I type http://redmine.engserver/ it works most of the time, but sometimes it ends up with a yahoo page search or something else. In the DNS cache it shows as (Server not found). ipconfig /displaydns I looked with wireshark and it seems like sometimes the client PC interrogates the secondary DNS (192.168.1.1) instead of the first 192.168.1.14. Obviously this one is a public domain and it does not have the redmine.engserver entry. What is wrong in this configuration? Is it even legitimate to have 2 DNS (one internal and one forwarded by the router) which are inconsistent? Is there another way to have a local name service in a small office network? Why is the router DHCP issuing itself as DNS?

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• Resolving CloudFlare DNS related mail delivery problems

  - by Andy Castles

  I recently started using CloudFlare and am having a few teething problems. Our domain is netlanguages.com and while we have a lot of sub-domains listen, we are currently only trialling a few of the servers through the CloudFlare CDN (for example, www.netlanguages.com is enabled for CDN, netlanguages.com is not). The actual CDN service seems to be reliable, but the problem that we are having is with DNS, and specifically with mail delivery. The background is that we have contact forms on our web site which use PHP mail() to send the details to end-users' email addresses, with the "from" address of the messages being [email protected] which is a valid address on our mail server. Most of the mails are arriving correctly, but a few specific people are not receiving them. The webserver uses qmail to deliver the messages, and the qmail log files show us some of the errors that the receiving mail servers return when they reject the mail delivery attempt. Two examples: Connected to 94.100.176.20 but sender was rejected./Remote host said: 421 DNS problem (interdominios.netlanguages.com). Try again later Connected to 213.186.33.29 but sender was rejected./Remote host said: 451 DNS temporary failure (#4.3.0) From what I can tell, the receiving SMTP server is doing a DNS lookup of some description on either the host of the "from" email address (netlanguages.com) or the server name given in the EHLO command of the SMTP conversation (in the first example above, interdominios.netlanguages.com), both of which should resolve to non-CloudFlare IP addresses. I've read that the CloudFlare DNS service is very reliable and fast but both of the problems above seem to point to a problem with remote servers unable to do DNS lookups. I should also point out that we changed our DNS to CloudFlare on 6th Feb, and since then started experiencing these mail delivery problems. On 22nd Feb we moved our DNS away from CloudFlare to see if the issues were related to CloudFlare and after a few hours delivery began to work. Then on 26th Feb I moved the DNS back to CloudFlare again and delivery problems started again. The issues definitely seems to be related to DNS, but I don't know if it's a configuration issue, or something else. Finally, I should say that our two DNS MX records point to non-CDN A record IP addresses, interdominios.netlanguages.com (the web and qmail server) also points to a non-CDN A record IP address. Does anyone know what the problem could be here? Any light you can shed on this will be most appreciated. Many thanks, Andy

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• Dynamic or Not Dynamic

  Discussion of dynamic keyword

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• Wildcard DNS and CNAME

  - by DNS Q

  I have a wildcard DNS entry (A) *.my.tld I also have a CNAME.. that I want hit BEFORE the wildcard A entry. something.my.tld - something.s3.amazonaws.com It's not imperative... but I'd like to be able to do this. I'm using a third party for DNS as well, so I can't hack around at BIND.

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• cpanel dns only / rdns questions

  - by Clear.Cache

  I started getting IPs from ARIN directly, instead of the data center I'm colocated at. Now I have to start applying rdns myself for my clients upon request, instead of having the NOC at the DC do this. That is obvious, since I am in full control over the IP delegation and therefore have nameserver authority. The question is, how do I "create" ptr / rdns records for my clients? My current server uses Cpanel / WHM with ns1/ns2.mycompany.com I also applied those as dns nameservers in the ARIN IP's whois record. How do I create rdns for my clients? Should I install Cpanel DNS Only on a entirely separate server and use this method instead? http://layer1.cpanel.net/ If so, how can I seamlessly transition over the dns records to that new dns server, retaining my ns1/ns2.mycompany.com and their ns1 and ns2 IP addresses? Even more important: I have to change the ns1/ns2 IPs to the new ones I retrieve from ARIN. How can this be done, avoiding downtime during the dns transition? On a side note, would it be easier to just install Cpanel DNS Only on a dedicated server and just use dns1.mycompany.com and dns2.mycompany.com with their own dedicated ns1/ns2 IPs from ARIN - and utilize this dns server for customers who request rdns? Would this be a more viable solution than using our current ns1/ns2.mycompany.com Nameservers? Is Cpanel DNS Only a standalone software that does not require Cpanel/WHM on another server? Is it possible to have redundant dns servers setup using this software solely, ns1 on one server and ns2 on another? Thanks.

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• Issues resolving DNS entries for multi-homed servers

  - by I.T. Support

  This is difficult to explain, so bear with me. We have 2 domain controllers, each multi-homed to straddle 2 internal subnets, (subnet A and subnet B) and provide dns, dhcp, and ldap authentication. Both domain controllers each have 2 DNS entries. both entries have identical host names, but correspond to subnet A & subnet B respectively (example entries shown): dc1 host 192.168.8.1 dc1 host 192.168.9.1 dc2 host 192.168.8.2 dc2 host 192.168.9.2 We also have a 3rd subnet for our dmz, (subnet C) which neither domain controller has an IP address on, but our firewall/routing tables provide access to subnet A from subnet C and vice versa, but don't allow access to subnet B from subnet C. Here's my issue. How can I force/determine which dns entry is used when a server on subnet C queries either domain controller by host name? Right now it seems to randomly pick one of the two entries, swaps out the name for the IP address and that's that. The problem is if it randomly selects the entry that corresponds to the 9.x subnet B (no access from subnet C), then the server fails to resolve. If it picks the entry for the 8.x subnet A then it resolves (firewall/routing tables defined for communication between these 2 subnets) Here's what I'd like to know: What are Best Practices (if any) for dealing with DNS resolution on subnets that the DNS servers don't have a presence on? Can I control something akin to a metric value to force an order of DNS resolution when there are multiple entries for the same host name that correspond to different IP subnets? Should I even have 2 DNS HOST entries for the same name? Here's what I'd like to avoid: Making edits to the HOSTS files of servers on subnet C to force DNS resolution of the hostname to the appropriate subnet Adding NIC's to the DC's to have them straddle the DMZ as well, thus obtaining a third DNS entry that corresponds to subnet C Again, my apologies if this was too verbose / unclear. Thanks!

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• How to setup equivalent USVIDEO.ORG DNS-Proxy on Linux

  - by Gary

  I have a VPS in the USA running Ubuntu. I want to setup something similar to http://www.usvideo.org Basically, USVIDEO is a DNS service that allows Canadians to access American content like Hulu, Netflix, NBC, and etc (restricted by geographical IP). Here is how I think USVideo does it: Clients (PS3, XBOX, PC) specifies the DNS server(s) as specified on USVIDEO.org's website. If the DNS request is a video/audio site such as Netflix or Pandora, forward the request to a proxy. Otherwise, for all other requests, forward it to a different DNS server. If the specific video/audio URL is requested, return the address of the proxy server, which in turn relays traffic to the destination video/audio domain via the U.S. gateway so that it appears that the access is coming from a U.S. IP address. Once the DNS request has passed the U.S. IP address check, their proxy server steps out of the loop and lets the video streaming site contact you directly to start the video stream. This trick relies on the way that the video streaming sites check the country of your IP address once up front, but don't actually check the country of the destination IP address while the video is streaming. What is elegant about this solution is that a VPN Tunnel is not required to bypass geographical IP checks from certain websites. All that is required on the client side is to specify the DNS server (the VPS). If a certain site is geographically locked, just forward the traffic to a proxy, and that's it. These sites can be specified in the DNS entries, or perhaps in the proxy service to redirect the DNS request to its own proxy. I believe what I need to setup something similar is Squid Proxy, IPTables, and DNS. What I need help is how to exactly approach this? Would Squid Proxy be setup as a transparent proxy?

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• Only one domains not resolving via Windows DNS server at multiple locations, but is at others

  - by Brett G

  I'm having quite a weird issue. Had mail delivery issues to a specific domain. After looking closer, I realized that the DNS for that domain isn't resolving via the in-house Windows 2003 SP2 DNS server. C:\>nslookup foodmix.net Server: DC.DOMAIN.com Address: 10.1.1.1 DNS request timed out. timeout was 2 seconds. DNS request timed out. timeout was 2 seconds. *** Request to DC.DOMAIN.com timed-out (DC.DOMAIN.com and 10.1.1.1 are generic values to replace the actual ones) Even if I run this nslookup from the DC.DOMAIN.com server, I get the same result. However, all other requests are working as they should. I tried it on severs at completely separate organizations on different networks(Windows 2003 AD servers). The weird thing is some of these were having the same exact issue. However using public DNS servers work. I have tried clearing the DNS cache, restarting the server, restarting the services, etc. Nothing has worked. One weird event I noticed in the DNS Server Event Logs that might be related is an event ID of 5504 with the following description: The DNS server encountered an invalid domain name in a packet from 192.33.4.12. The packet will be rejected. The event data contains the DNS packet. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. In the data section below, I can see the following mentioned: ns2.webhostingstar.com Which happens to be the nameserver for the domain in question. Several discussion threads and a MS KB have pointed to disabling EDNS. I have done this via "dnscmd /config /enableednsprobes 0" and it has not fixed the issue.

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• Configure an Azure VM for Dynamic DNS for Cloud Services

  - by Adam

  I am trying to setup an azure VM with proper DNS to allow multiple cloud services to communicate across cloud service boundaries. As I understand it, I need to provide my own DNS server. I do not have any on-premise infrastructure, so I am trying to configure an Azure VM to act as my DNS. This SO question (http://stackoverflow.com/questions/21858926/azure-how-to-connect-one-cloud-service-with-other-in-one-virtual-network) is very similar to my setup. This article (http://msdn.microsoft.com/en-us/library/windowsazure/jj156088.aspx) describes my particular case: Name resolution between virtual machines and role instances located in the same virtual network, but different cloud services Here is what I have done: Created Azure Virtual Network and declared subnets for each of my cloud services. Created an Azure VM (Windows 2012 R2) with DNS enabled RDP to the VM and enabled the DNS role and installed features Added the appropriate NetworkConfiguration xml section to each of my cloud services .csfg files Re-deployed my cloud services I have verified that I setup the virtual network and networkconfiguration properly because my cloud service hosts are able to communicate with each other if I use the internal ips. However, name resolution doesn't appear to be working, and it doesn't appear that my cloud service roles can communicate with my DNS server. How do I configure my VM so that my different cloud services roles register themselves with my DNS server? EDIT: I think I am 1 step closer to getting this to work. The cloud services that I was using are in an old affinity group which is not supported by VMs, so I was unable to add my VM into my virtual network. I created a new VNET in a new affinity group with my VM added into it. However, I still don't know how to configure the azure VM's DNS server so that the cloud services register themselves for name resolution. Also, an added bonus guaranteed to get a +1 would be to explain if it is possible to register a DNS entry for the VIP for an internal endpoint of my cloud services so we can get load balancing. Thanks!

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• switching dns server providers

  - by Yoav Aner

  I'm trying to wrap my head around something that I thought I kinda understood, but clearly there's some piece missing. We're currently using Zerigo as our primary dns, with slave dns running on linode. This works quite well. However, recent DDOS attacks on zerigo meant that whilst dns queries were still resolved, we were unable to make any dns changes. Since we rely on dns changes on our own infrastructure, I'm looking to improve this somehow. I'd rather not ditch zerigo completely, and realise that this or similar problems can happen with ANY primary dns hosting provider. It might not be DDOS, but a bug on their server, or something that means we can no longer issue updates. For this I want to have some fallback option: a completely independent (primary) dns provider (maybe AWS), which we will keep in-sync manually. We will switch-over to it when there's a problem. This brings me to my question: How do I make sure we can switch those providers quickly enough? specifically, on our registrar, there's a list of name servers, but no settings like TTL etc. How do dns clients know to use the newly updated name server records? Is this configured in the SOA? However, the SOA itself is hosted with the dns provider and we might not be able to update it... This is not a question about a one-time move, which can be planned and scheduled and tested, but rather to be able to do so when things are half-broken.

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• b Is it bad to have the Reverse DNS for two IPs point to the same domain name?

  - by Daniel Vandersluis

  I am in the process of setting up a new server for my web application (the site will be moved, it is not for load balancing or the like), which has a different IP address from my existing server. My current server has a reverse DNS PTR record set up pointing its IP to mydomain.com. Is it bad to set up a reverse DNS PTR record for the new IP pointing to mydomain.com as well? Or should I wait until I do my migration to set up the record? Update: I forgot to mention, the A record for the mydomain.com points to the old server's IP address, not the new one, if it matters.

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• Using PowerShell, in Active Direcotry, how would I change all the DNS A records that have a given IP to a new IP?

  - by djsumdog

  We've been moving data centers and I have a lot of old records that were not correctly but in DNS as CNAME records, but A records that have a direct IP (e.g. 192.168.100.n) and they're all moving to a new subnet (10.19.100.n). I just need to write a powershell script to change all those records. I found this site: http://www.indented.co.uk/index.php/2008/12/30/administering-microsoft-dns-in-powershell/ and from it I made this simple script: $dnsServer = "meldc2" $scope = New-Object Management.ManagementScope("\\$dnsServer\root\MicrosoftDNS") $path = New-Object Management.ManagementPath("MicrosoftDNS_Zone") $options = New-Object Management.ObjectGetOptions($Null,[System.TimeSpan]::MaxValue, $True) $ZoneClass= New-Object Management.ManagementClass($scope,$path,$options) $Zones = Get-WMIObject -Computer $dnsServer -Namespace "root\MicrosoftDNS" -Class "MicrosoftDNS_Zone" $Zones | Get-Member foreach($Z in $Zones) { $Z | Select-Object Name,DsIntegrated,ZoneType,Reverse,Data } but that only gets me a listing of root zones. I don't understand how to iterate over all the entries in each of the zones. Also, all the examples I've seen involve adding new zones, but there aren't any examples I can find on modifying existing A records.

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• Weird entry for robots.txt on a Naked Domain in Google Webmaster Tools

  - by Metalshark

  We own a .co.uk address and use an Internet hosting company that has made mistakes around DNS in the past. Our main site is hosted on www. and their reluctance to allow editing of AAAA records on-line means our naked domain does not resolve. Currently when we attempt to reach the naked version there is no entry for the browser to go to and it displays an unreachable page (nslookup just says Name: name of domain with no further entries such as an IP or Canonical Name). We recently added the relevant TXT records to verify us to view both the www. version and the naked version of the domain in Google Webmaster Tools (in anticipation of the requests to our Internet host coming to fruition). Imagine our shock when double checking the Site configuration Crawler access and finding a (admittedly failing) robots.txt with a dynamically generated HTML page (full of crude pop-up JavaScript) with references to 3 of our most prominent competitors. What could cause this to happen? As we are in the UK I am assuming some DNS server is serving Google bad information. We are going to contact the Internet hosting company to fix our A and AAAA records once and for all, then check that they work in the US (using something like OpenDNS). Should we be doing more though, for instance informing Google (through Webmaster Tools) that we are now aware there is something currently wrong with our naked domain? UPDATE: We have fixed our A records (not AAAA) and that has resolved the issue. But if there are further actions we should take for effectively having a parking page hosted on our active visitor-heavy, SEO-rich domain that advertised our competitors to US visitors, what would they be?

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