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• bind9 dns proxy

  - by Zulakis

  We are offering multiple SSL-enabled services in our local network. To avoid certificate-warnings we bought certificates for server.ourdomain.tld and firewall.ourdomain.tld. We now created a zone in our local DNS-server in which we pointed the hosts to the corresponding private-ips. Now, each time another record for ourdomain.tld, like for example www.ourdomain.tld or alike are changed, we need to update it on both our public-dns-server AND the local dns-server. I would like our local bind-dns to serve all the information from our public-dns but serve different information for these 2 hosts. I know I could possibly have our private-ips in our public-dns but I don't want that for security reasons. The internet dns-server is being managed by a third party, while we have full control of the intranet one. Because of this I am looking for a solution which lets the intranet retrieve the records from the internet one.

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• why my dns always give wrong ip?

  - by xjdrew

  My dns always resolve learnxue.com with wrong IP, even when I change dns server and execute ipconfig /flushdns. answer from 8.8.8.8: > learnxue.com Server: google-public-dns-a.google.com Address: 8.8.8.8 Non-authoritative answer: Name: learnxue.com Addresses: 97.74.42.79 97.74.42.79 answer from 61.147.37.1: > learnxue.com Server: d.center-dns.jsinfo.net Address: 61.147.37.1 Non-authoritative answer: Name: learnxue.com Addresses: 97.74.42.79 97.74.42.79 My friends living in other city, using dns 61.147.37.1, can get right result, as below: > learnxue.com Server: d.center-dns.jsinfo.net Address: 61.147.37.1 Non-authoritative answer: Name: learnxue.com *Addresses: 222.73.173.188* Is my dns hijacked?

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• Edimax wireless router is not providing DNS services correctly

  - by Nathan Fellman

  I have an Edimax router that is set up to connect to the internet via L2TP on cable, and on the LAN side it's set up as a DHCP server. The DHCP server gives correct IP addresses, but it sets itself up as the DNS server. However, it doesn't provide the DNS service. I am sure that it's a problem with the router, because I have two computers on the network with the same problem. I see that on the WAN side it gets correct DNS addresses from the ISP, so I'd expect the router to either pass these addresses through to the DHCP clients, or to serve the DNS requests itself by forwarding them to the ISP's DNS. However, it apparently does neither, and there is no DNS. I switched from ADSL to cable last week. On ADSL it connected using PPPoE, and the DNS worked fine. What can be the problem here?

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• Personal DNS server and fallback outside home

  - by Jens

  I have my own DNS server at home to access local names, and that is working fine. Then I have my laptop, now obviously my laptop leaves the home now and then, therefore it accesses different nets outside my home, and my DNS server is not accessible there... So I figured that I would just add Google as secondary DNS... But actually, when I do that, then suddenly I can't access my local stuff (at home that is, obviously), like my laptop is getting a quicker response from Google's DNS or something, because it can't find anything on the addresses I use locally. If I then remove the secondary DNS, and keeps my own, then it works fine again... So do I somehow need to seperate what DNS's to use on what nets? I already use sepperate DNS settings when I connect using my 3G modem, but when I use hotspots it seems to use the same settings regardless (at least in the train), also can it differ wired connections?... Is there another solution?

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• Reduce Windows DNS Service caching on Window

  - by Nick G

  I'm struggling with DNS caching issues on a Windows based LAN. I've noticed that if I change a DNS record on a domain hosted by a 3rd party nameserver, that I always seem to be the very last person to see the change happen. I can often query the domain using a service which checks propagation around the world like www.whatsmydns.net but I usually find that all other DNS servers are correct and it's only my own server which has the old IP - even 8-12 hours later. This is an issue for us as we're website developers and often making changes to DNS records so these huge delays are frustrating. It seems to be because our primary domain controller server (+Active Directory & DNS) on our LAN (which is also our local DNS server) caches records for AGES (Way beyond it's published TTL). How can I stop the Windows DNS server from caching, or reduce the caching to only an hour or so?

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• Duplicate DNS Zones (Error 4515 in Event Log )

  - by Campo

  I am getting these two error in the DNS Event log (errors at end of question). I have confirmed I do have duplicate zones. I am wondering which ones to delete. The DomainDNSZone contains all of our DNS records but it does not have the _msdcs zone.... that is in the ForestDNSZone with the duplicates that are not in use. here is a picture of that 3 Questions. I understand the advantages of having DNS in the ForestDNSZone. so... Why is DNS using the DomainDNSZone and is that acceptable considering _msdcs... is in the ForestDNSZone? If so, should I just delete the DC=1.168.192.in-addr.arpa and DC=supernova.local from the ForestDNSZone? Or should I try to get those to be the ones in use? What are those steps? I understand how to delete. That is simple but if i must move zones some info would be appreaciated there. Just to confirm. from my understanding. I can delete the two duplicates in the ForestDNSZone and leave the _msdcs.supernova.local as thats required there. This will resolve the erros I see. Just fyi when I look in those folders from the ForestDNSZone they have just 2 and 1 entries respectively. So obviously not in use compared to the others. I am pretty sure I understand the steps to complete this. But if you would like to provide that info, bonus points! Event Type: Warning Event Source: DNS Event Category: None Event ID: 4515 Date: 1/4/2011 Time: 2:14:18 PM User: N/A Computer: STANLEY Description: The zone 1.168.192.in-addr.arpa was previously loaded from the directory partition DomainDnsZones.supernova.local but another copy of the zone has been found in directory partition ForestDnsZones.supernova.local. The DNS Server will ignore this new copy of the zone. Please resolve this conflict as soon as possible. If an administrator has moved this zone from one directory partition to another this may be a harmless transient condition. In this case, no action is necessary. The deletion of the original copy of the zone should soon replicate to this server. If there are two copies of this zone in two different directory partitions but this is not a transient caused by a zone move operation then one of these copies should be deleted as soon as possible to resolve this conflict. To change the replication scope of an application directory partition containing DNS zones and for more details on storing DNS zones in the application directory partitions, please see Help and Support. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 89 25 00 00 %.. AND Event Type: Warning Event Source: DNS Event Category: None Event ID: 4515 Date: 1/4/2011 Time: 2:14:18 PM User: N/A Computer: STANLEY Description: The zone supernova.local was previously loaded from the directory partition DomainDnsZones.supernova.local but another copy of the zone has been found in directory partition ForestDnsZones.supernova.local. The DNS Server will ignore this new copy of the zone. Please resolve this conflict as soon as possible. If an administrator has moved this zone from one directory partition to another this may be a harmless transient condition. In this case, no action is necessary. The deletion of the original copy of the zone should soon replicate to this server. If there are two copies of this zone in two different directory partitions but this is not a transient caused by a zone move operation then one of these copies should be deleted as soon as possible to resolve this conflict. To change the replication scope of an application directory partition containing DNS zones and for more details on storing DNS zones in the application directory partitions, please see Help and Support. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 89 25 00 00 %..

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• reverse proxy only from one internal server

  - by hrost

  I have configured a reverse proxy and is working ok for one internal server, for example our mail server. Now, I like to know if it is possible to configure a reverse proxy for only one server /application (in this case our web intranet). Our problem is Intranet call another aplication inside same intranet server and another internal servers, and the only way that I know to publish this resources is make a reverse proxy in our dmz apache for all apllications servers, but I like that from our DMZ reverse apache only intranet will be called, and other applications will be called by intranet server, and not reverse proxy. I like to configure with this system for security reason, and only allow external access to one server. I have configured With Debian Squeeze and apache 2.2 It is possible? How?

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• Redirect/rewrite dynamic URL to sub-domain and create DNS for subdomain

  - by Abdul Majeed

  I have created an application in PHP, I would like to re-direct the following URL to corresponding sub-domain. Dynamic URL pattern: http://mydomain.com/mypage.php?user_name=testuser I wish to re-direct this to the corresponding sub domain: http://testuser.mydomain.com/ How do I create a rewrite rule for this purpose? How do I register DNS for sub-domain without using CPANEL? (I want to activate sub-domain when the user registers to the system.)

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• Forwarding non-www domain to other domain with dns

  - by Zen Savona

  Is it possible to forward firstdomain.com to www.seconddomain.com or seconddomain.com using surely dns records? I know how to forward www.firstdomain.com to seconddomain.com (with CNAME). What I am trying to do is move my site from one domain to another (new) one, and not break all the links which use the old domain name. I can't do a 301 redirect as it's hosted on Github Pages and I don't have access to the webserver. Thanks

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• How would I setup reverse DNS for 2 email servers?

  - by Solignis

  I have an interesting DNS question (well interesting to me atleast). I just installed an hmail server in our remote office to act as an MX backup in the event our exchange server goes down. The 2 host names are mail.campbellsurvey.com mail2.campbellsurvey.com mail points to the address 98.XXX.91.XXX mail2 points to the address 70.XXX.190.XXX How would I setup a PTR record on the ISP end to reflect both hostnames? Does the PTR have to point to EXACTLY mail.campbellsurvey.com or can it point to just campbellsurvey.com? because right now anything passing through the primary static address in our pool (the one used for standard internet) is identified as mail.campbellsurvey.com. My only idea to fix this was to move the mail server to the next available address and give it only it the name mail.campbellsurvey.com but I wanted to see if there was another way. Thanks in advance.

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• Can I autoregister my clients/servers in local DNS?

  - by Christian Wattengård

  Right now I have a W2k12 server at home that I run as a domain controller. This has the extra benefit of registering every "subordinate" computers name in it's DNS so that I don't have to go around remembering IP's all the time. (And it let's me easily run dhcp also on my servers). I need to rework my home network for several odd reasons, and in this new scenario there is no place for a big honking W2k12 server box. I have a RasPI, and I have other smallish linux boxen I can use. (In a worst case scenario I'll use my NUC, but then I'll be forced to use my home cinema's UPnP-client for media... The HORROR!!) Is it possible to set up a DNS-server-"appliance" that somehow autoregisters it's own hostname.. Scenario: Router (N66u) on 172.20.20.1. Runs DHCP on 172.20.20.100-200 range. Server [verdant] of a *nix flavor on 172.20.20.2 Laptop [speedy] of W8 flavor on DHCP assigned Laptop [canary] of W8 flavor on DHCP assigned Desktop [lianyu] of Ubunto flavor on DHCP assigned What I would like is that all of the above servers (except possibly the router) would be available on verdant.starling.lan and canary.starling.lan and so on. This is how it works right now (except the Ubuntu box... I haven't cracked that one yet) because Windows just does this for you.. I would also be able to do this without any manual labor on the server. When I tell my box it's name is smoak it should "immediately" be available as smoak.starling.lan without any extra configuration on my part. How can I do this in a Linux (Ubuntu) environment? (Bonus comment upvote for naming the naming scheme :P )

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• DNS Piority in home-use Routers

  - by DucDigital

  Force DNS on router instead of ClientSide DNS like OpenDNS or GooglePublicDNS Im trying to implement some site blocking using DNS, the hardware is simple Routers like Linksys and Netgear that you use in house for family purpose. Currently I tried to set a computer to opendns, while my router set to something else, when check using opendns.com/welcome, the computer is identified as opendns. and Vice versa, this time the computer didn't identified as opendns. Is it posible to force user to use our DNS instead of their setting DNS?

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• DNS Piority in home-use Routers

  - by DucDigital

  Force DNS on router instead of ClientSide DNS like OpenDNS or GooglePublicDNS Im trying to implement some site blocking using DNS, the hardware is simple Routers like Linksys and Netgear that you use in house for family purpose. Currently I tried to set a computer to opendns, while my router set to something else, when check using opendns.com/welcome, the computer is identified as opendns. and Vice versa, this time the computer didn't identified as opendns. Is it posible to force user to use our DNS instead of their setting DNS?

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• I have too many DNS servers configured

  - by Jon Will

  I have my laptop connecting to my wireless router, and I have told the router to issue out DNS via the DHCP lease. The laptop is configured to use the information. The router is configured to only issue two DNS server addresses from open dns, but the laptop reports Networking Dns Servers: 10.197.100.1 10.197.100.2 10.197.100.3 8.8.8.8 8.8.4.4 208.67.222.222 208.67.220.220 I have no idea where the laptop is getting these additional IPs as DNS. Please advise.

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• Windows Server 2008 DNS - restart after changing forwarder?

  - by Jim

  I had a dns forwarder configured that seems to be choking on a particular server name so I switched to using google's dns as a forwarder (8.8.4.4). When I change that setting in Windows DNS (Server 2008 R2) Do i need to restart the dns service for the change to take effect? I ask because i can do a nslookup on the name using 8.8.4.4 and it resolves but even with 8.8.4.4 in my forwarders list it will not resolve when i run nslookup on my local DNS server.

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• Multiple IPs on single server - Specify which is used to connect (MS server 2008 / DNS)

  - by runboy

  I have a Windows 2008 server with multiple IPs that is acting as DNS server. I have set the DNS server up to only accept connections on a single of these IPs. The DNS is serving as secondary DNS and when it connects to the primary DNS server it is not connecting with this particular IP address, but one of the other IPs. Is there a way in which I can make sure the server connects using the correct IP?

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• What are the right reverse PTR, domain keys, and SPF settings for two domains running the same appli

  - by James A. Rosen

  I just read Jeff Atwood's recent post on DNS configuration for email and decided to give it a go on my application. I have a web-app that runs on one server under two different IPs and domain names, on both HTTP and HTTPS for each: <VirtualHost *:80> ServerName foo.org ServerAlias www.foo.org ... </VirtualHost> <VirtualHost 1.2.3.4:443> ServerName foo.org ServerAlias www.foo.org </VirtualHost> <VirtualHost *:80> ServerName bar.org ServerAlias www.bar.org ... </VirtualHost> <VirtualHost 2.3.4.5:443> ServerName bar.org ServerAlias www.bar.org </VirtualHost> I'm using GMail as my SMTP server. Do I need the reverse PTR and SenderID records? If so, do I put the same ones on all of my records (foo.org, www.foo.org, bar.org, www.bar.org, ASPMX.L.GOOGLE.COM, ASPMX2.GOOGLEMAIL.COM, ..)? I'm pretty sure I want the domain-keys records, but I'm not sure which domains to attach them to. The Google mail servers? foo.org and bar.org? Everything?

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• List all DNS records in a domain using dig?

  - by Runcible

  My company runs an internal DNS for "mycompany.com" There is a machine on the network that I need to find, but I've forgotten it's name. If I could see a list, it would probably jog my memory. How can I list all of the domain records for "mycompany.com"?

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• Why are .local and .arpa DNS queries showing up outside my network on OpenDNS?

  - by Baodad

  We have a Windows office network with a local Actice Directory/DNS domain server. The server is set up with OpenDNS's servers as forwarders (see screenshot). However, when I look at my OpenDNS query statistics, I notice that the 3rd most popular query is *.in-addr-arpa, and the 12th is *.local which is from our local domain. Should I, or how can I prevent these local queries from going beyond my local network?

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• Windows 2003 DNS or IIS6 Problem?

  - by Mario

  Weird DNS problem... We have an intranet located internally on a windows 2003 / iis6 server - DNS handled internally on another windows 2003 server. The intranet, amongst other functions, hosts a ecommerce store I wrote that sells nike apparel embroidered with our company logo. Up until recently, it would send an email to payroll and the cost would be deducted from the employees paycheck. lets say this store is located at http://mydomain.com (only available internally) Now, we've been told by the accountants that we can no longer auto deduct from payroll and the employee needs to pay with a credit card or cash. So i went to thawte.com and ordered an SSL cert to be on the safe side (even though the CC gateway is secure) and they told me i need to drop the .com from the domain name Not wanting to mess with a system thats perfectly functional, i created another DNS entry that just points to mydomain (no .com) and left the old one in there. so they would go to http://mydomain On my Mac (OS X 10.6) i can hit either one just fine On Windows XP / Windows XP Embedded or Windows 7 (the vast majority of the pc's on our network) http://mydomain - returns nothing http://mydomain.com still works https://mydomain.com works but says the cert is invalid (as it should, it was issued to mydomain - not mydomain.com) my question is: why does it work on my Mac and not on a Windows PC (i get dhcp and dns just like any other pc on the network) and will removing the .com one from the DNS server resolve this? I've done all the usual attempts - ipconfig /flushdns, ipconfig /renew and release even going so far as to stop and restart DNS client on my Windows 7 box; rebooting and shutting down - adding a regedit entry something along the lines of SecureResponses and rebooting nothing works... I think its the .com and the not conflicting in DNS but i'm not sure - and why not on OS X We're closed on sunday and i'm going to remote in and see what happens if i remove the .com from DNS but any other ideas? -Mario

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• Windows AD DNS: Event ID 5504

  - by Chris_K

  Two of my AD controllers (both running DNS service) appear to be having a similar issue. Both are throwing lots of events in the DNS events that look like this: Event Type: Information Event Source: DNS Event Category: None Event ID: 5504 Date: 5/24/2010 Time: 11:51:38 AM User: N/A Computer: ALPHA Description: The DNS server encountered an invalid domain name in a packet from 76.74.137.6. The packet will be rejected. The event data contains the DNS packet. That will come with the same event, same time, with a packet from 76.74.137.7 as well. I know this is "Information" not an error, but since it is new and different it bothers me (yes, I fear unexplained change!) Both machines are running Windows 2003 R2 SP2. The DNS servers are not exposed to the internet. Both DNS servers are configured to use OpenDNS for Forwarders. For both servers, this started about a week ago. Any thoughts on: 1) should I be concerned? 2) how can I stop/fix this? To keep it interesting, I have a 3rd AD / DNS box. Same domain, different Active Directory site. Same forwarders, yet doesn't have this issue.

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• trouble setting up dns for vps

  - by Zenph

  I had registered a domain at namecheap and forwarded the dns to my host at vps.net. The strange thing is, when I did that the site was showing up. I even uploaded files and everything was displaying correctly on my new domain. Now, it is just the namecheap holding page again. I have no idea why this is happening as I haven't touched the configuration since it was working. Could anyone point me in the right direction? When I enter http://domain.com it redirects to http://www.domain.com and the namecheap holding page is shown. Prior to this domain.com was showing what the host was serving. I am completely lost and have no idea where to start so I'd appreciate any help I can get.

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• Running DNS locally for home network

  - by Roy Rico

  I have a small home network that just got larger ( New roommate, My existing roommate got a laptop (on top of her computer)j, my friends coming over with laptop, etc ). I'd like to run a local DNS server for lookups of my local network stuff (fileserver.local, windowsTV.local, machineA.local, machineB.local, appletv.local). I used to have a business line with a static IP, and run bind/named internally. However, now, I have a normal account. My ISP's DNS servers are constantly changing (for whatever reasons my ISP doesn't like to keep the same IP range for long). I need my local DNS to be automatically updated to use my ISP's DNS for external traffic, but be able to maintain an internal DNS server (getting to update the hosts file is being a hassle with every new machine on top of rebuilding existing machines with win7 or Ubuntu 9.04). Additionally, My ISP's DNS servers often crash or become unresponsive. Are there any open DNS servers that are reliable (i don't want to reconfig every day) that I could use as my primary, then if those fail, then use my ISP's? UPDATE: Also looking for each workstation to be able to use dhcp to connect, but instead of getting ISP dns servers, getting my internal one.... Thanks

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• DNS slowdowns on development environment

  - by Sequenzia

  I have a local development environment setup on my Mac. I am running an Ubuntu Web Server inside of a Virtual Box VM. I setup a host file on my Mac that points my dev site to the IP of the Ubuntu Virtual Server. Everything works good other than the fact a lot (not all) of the time it takes more than 5 seconds to load a page. I used firebug to track down where the problem is and when it's slow the DNS part of my request is taking over 5 seconds. Like I said it's not all the time. Sometimes it resolves and loads the page within milliseconds. The same page one click will be super fast and then the next time it takes over 5 seconds. It's really slowing me down and I am not sure what is causing it. Anyone have any ideas? Any help would be great. Thank

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• DNS and WIldcards

  - by Thomas Chapman

  Whenever I attempt to make a record for *.schneiderdonnelly.com.au and CNAME it, I get two errors: You can't mix CNAME/MX records together using the same hostname. Domain root's cannot be CNAME's, however you can web-forward this record to www.schneiderdonnelly.com.au instead for the same effect. I've read it's possible so why can't I make it work? I donated $5 to be a premium member and I've been trying to make it work for yonks. http://i.stack.imgur.com/D9Ui5.jpg This is how I want it to appear. The last record. I am prepared to swap DNS providers as long as they're free.

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