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• Reverse DNS for two ADs in the same subnet

  - by SpacemanSpiff

  I currently have two separate AD forests that exist within the same subnet. The two forests have independent copies of the reverse lookup zone for that subnet. Example: Domain A DC1: 10.1.1.1/24 Domain A DC2: 10.1.1.2/24 Domain A AppServer1:10.1.1.3/24 Domain B DC1: 10.1.1.11/24 Domain B DC2: 10.1.1.12/24 Domain B Appserver1:10.1.1.13/24 What I'm after, is a configuration that allows this reverse zone to be shared between them so that both sets of DNS servers can make updates to the zone. This kind of thing is a little far from my everday work, so a kick in the right direction is a welcome suggestion as well. Decoupling one AD into new segments is a possibility I'm open to but would like to avoid if possible. If there is a DNS related solution I'd prefer that.

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• DNS Problem in my notebook [closed]

  - by user20989

  i have windows 2003 server domain environment in my office. my server ip is: 192.168.1.2 if i put this IP in DNS of my laptop network card my folder SYNC works fine & also internet work fine in office. but internet did't work in my home for that i need to change DNS again to Auto & internet start working again. its too difficult to change cause some time i don't have administrative password. is there any solution to that? Thanks

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• incorrect DNS entries on server 2008 r2

  - by user137841

  On the main DC (windows server 2008 R2 standard) in our network I have to clear some old DNS entries every now and then in the Forward and Reverse Lookup Zones. I have set the server Aging/Scavenging settings to Scavenge stale resource records, with both the No-refresh interval and Refresh interval to 5 days. Yet every now and then I still have to logon to the sever and remove the DNS entries for computers that is not part of the domain anymore or has been renamed ect. Is there a different way to automatically remove the old entries?

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• Windows 2003 Server Intermittent DNS Issues

  - by Mike

  Looking for a little help here. I have a Windows 2003 DNS Server set up on our network. Lately computers on our LAN have been, at times, unable to resolve a certain sub domain for our website whereas other times the request is resolved just fine. During these periods of "downtime" all other network activity (i.e web sites, internal resolutions, network shares, etc.) remains normal. I can tell it is a problem with our DNS server because the resolution always works from outside our network. I'm hoping someone out there has experienced something similar or could at least offer me place to start troubleshooting. Thanks!

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• Relation between Apache and DNS configuration

  - by KayKay

  I configured my DNS (bind9) to accept every subdomain, using a wildcarded 'A' record : *.mydomain.tld. IN A xx.xx.xx.xx I configured Apache to serve some specific subdomains using virtual hosts : <VirtualHost *:80> ServerName sub1.mydomain.tld ServerAlias sub1.mydomain.tld JkMount / sub1JK JkMount /* sub1JK </VirtualHost> when I ping from a remote computer on a subdomain configured in apache I get a response. When I ping on a subdomain that is not configured in apache, the host is not found. I don't understand why apache configuration would affect DNS resolution like this? I would appreciate any information that helps me understand this. Thanks a lot.

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• Microsoft DNS Server (Windows 2008) CNAME issue

  - by Lukes123

  I am using the DNS role in Windows Server 2008 R2. I have my records set up correctly with the following CNAMEs: {removed domain names for security} Currently, only the 'wsp' cname works. All the records are identically set up. I have checked with a DNS checker, and the other two CNAMEs do not resolve to anything. I have tried restarting the server, re-creating the forward lookup zone. Can anyone see what is wrong? 'A' records work fine when set.

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• Setting up a DNS port redirect?

  - by Svetlana

  I have a domain using CloudFlare's DNS, I want to make it redirect to my server's IP (dynamic IP, port 21 blocked by ISP) which at the moment uses a No-IP DNS. The current setup is that I have a subdomain as a CNAME targetting the No-IP domain, but that only works for things like the Minecraft server (which looks for a set port that isn't blocked by my ISP), and I'd like a solution that lets me redirect port 21 from the CloudFlare domain to port 2121 on the No-IP domain, or something else that points to my dynamic IP, where an FTP server is already set up and running. I've had SRV records mentioned to me but without any further help, and it only made me more confused. Thanks in advance for the help.

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• Google Cloud DNS and DNSSEC?

  - by Joe Burnett

  Since Google Cloud DNS does not currently support the record types for DNSSEC, is there any way to begin implementation of DNSSEC using TXT records? If I were using Google Cloud DNS, which I am, and they currently only support record types which include SOA, A, AAAA, CNAME, MX, NS, SPF, SRV, PTR and TXT: am I able to do it while constricted to these record types? Or do I have to wait until support is hard-coded into the service? I am just wondering because I would really like to ensure absolute integrity for my company so that I only convey realness in it's purity. =D

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• Update a DNS to a for a dynamic IP

  - by zobgib

  I want to use my schools connection as a place to host a small webserver but one problem I have run into is anytime my server reboots I am given a new IP inside the schools range. All of the schools IP are public and therefor I can access my computer directly over WAN just via the IP given in ifconfig. I would like to be able to give my computer a dns which is easy enough when I change the Arecords to match the current IP of my computer. The problem is if my computer ever reboots (my school regularly cycles power at night and over holidays) I am assigned a new IP and have to realize it then update the Arecords This is inconvenient and I figure there must be a better way to keep the DNS records updated either via a script or my own BIND server. That way if there is a power cycle I can still access the server via a Domain Name. If you have any direction to point me in it would be much appreciated. I am running Ubuntu 10.04 if that helps :).

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• Empty AAAA DNS Record with long TTL?

  - by Joel K

  I pay for a DNS service based on queries per second. We are not using IPv6, but a large number of queries (that I pay for) are coming in for AAAA records. I understand that most DNS stacks will now ask for A and AAAAs at the same time, and that I can't change that. What I /would/ like to do is put something in the AAAA records with a long TTL. (decreasing my hit rate) Is there anything I can put? Null? The equivalent IPv4 Address? Any guidance would be appreciated.

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• DNS problems : correct nameserver, namserver working, but not resolving

  - by user1719624

  My problem is as follows. Any suggestions are welcome. [domain].org is not resolving whois and checking the registry information shows that the correct nameserver is set. The primary nameserver is also the server on which domain.org is hosted. The primary nameserver is also used for a number of other domains, and is working fine for those. Logging into the server, I can ping [domain].org and it resolves correctly. Setting the nameserver as my own DNS server on my laptop, and the URL resolves correctly. If the domain has the correct nameserver set, and the nameserver can resolve the URL to the correct IP address, and if I use the nameserver as my DNS then it resolves correctly, AND the nameserver is used for other domains which are resolving correctly, then why isn't it working? NB : this is a new domain registration and has been set up for around 10 days now, so it's not simple slow propagation. Any ideas? thanks

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• pfSense router gives DNS rebinding warning when accessing subdomains

  - by Richard Maddis

  I have just set up a router running pfSense on our network and forwarded the appropriate ports. I have a small web server running in my network, and a domain name pointing to our (WAN) IP. When accessing that domain name, everything works fine. However, when accessing a subdomain of the domain name, pfSense will give a DNS rebinding warning. This did not happen back when I used a DD-WRT router. What is the proper way to fix this? The DNS records for the subdomain also point to the same address (I use a virtual server to differentiate the subdomains.)

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• Plesk 9.2.2 DNS Zone files

  - by Johan

  Where does Plesk 9.2.2 store the zone files for domains configured with DNS servers?

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• Disable Network settings (TCP/IP & DNS) on Windows 7 Ultimate

  - by TiD91

  i also read this discussion here How to disable Tcp/Ip settings in windows 7 via GPO? about what i want to do but i still have problems. So here i am: i have a desktop pc with two accounts, both with Administrative rights. One is used by the entire my family, in particular by my brother. The problem is that i set some DNS and IP configurations to let be possible the VNC connection from remote. Now i would like to disable the network settings (TCP/IP and DNS) to prohibit my brother to change it preventing me to connect to it. So how can i do this? I set the policies from GPO but i still can change these settings from his account. Here's a pic of Registry Keys: http://imageshack.us/a/img339/3310/famigliapc2012092017274.png what didn't i do? Thanks in advance for your help. Rub|TiD

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• Mirrored servers in data centers nationwide -- how?

  - by Sysadmin Evstar

  I flubbed my IT interview with Google by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request went to a local DNS server in a geographically nearby datacenter, which then returned an IP address for just one of several nearby http servers, which then rollover'd to the next local server, and I could not explain how or where the nationwide DNS kept its table of the available local servers cached, or how such a rollover happened. Or how they could manually take some server out of rotation, from anywhere. Fail. So, which Wikipedia page should I be looking at now so I can ace this question next time? And, what daemons run on these machines 24/7 to keep the mirrored database disks synchronized?

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• QPS for dnscache

  - by vedaprasad

  I have 2 internal DNS servers ( ns1 & ns 2 ) on ubuntu 12.04 which run dnscache , and my clients resolv.conf have something like nameserver ns1 nameserver ns2 nameserver 8.8.8.8 since all my load is taken by ns1 , where as ns2 sits idle until ns1 is down or not serving my request . i would like to add these 2 server under a LB VIP . but my network team wants to know the QPS of the ns servers so that their LB is loaded . so is there any way to find out the QPS of dns queries running Dncache

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• Configuring a backup DNS server

  - by mattyh88

  I would like to setup a backup DNS server. I have added all my name servers in my domain name panel. (ns1.domain.com, ns2.domain.com, etc ...) If a person would try to go to domain.com and the first name server would fail, will it automatically try and use ns2.domain.com? All my DNS servers have the same master zones configured. Is that the way to go? Is it that easy or am I missing something here? :)

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• What's required to configure Ubuntu to use a specific DNS server?

  - by ks78

  I've setup two Amazon EC2 instances, both running Ubuntu Server. One is configured as a DNS server running bind9, which will be used to allow EC2 instances to communicate with each other based on hostname rather than IP, since their private IPs may change. I think I have the DNS server setup correctly. I want to use the second EC2 instance to test the DNS server. Using Webmin, I've added the DNS server's private IP to the client's DNS Servers list and added the domain to the Search Domains list. I did have to edit /etc/dhcp3/dhclint.conf to make my changes stick. After reboot, I expected I'd be able to ping or nslookup the DNS server from the test client, but it can't seem to find the server. Is there something I'm missing? What's required to configure an Ubuntu client to use a DNS server? I just want to make sure I'm not missing something before I assume the server's the problem.

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• How do I set zone priority in Microsoft DNS?

  - by Justin

  I have a standard small network setup (20 users) on Active Directory. All Windows machines have a primary DNS server as the AD and a secondary DNS server as Google PDNS. I want to setup a DNS entry that exists in real DNS but set it up on our DC so that local requests would route this public domain to a local development machine on the network. I setup the zone in DNS which results in the clients resolving the public FQDN to our internal IP. However, sometimes it still resolves to the "real" value (I check by pinging it). Is there some way to give the zone definition in my DC DNS higher priority? Or will the client that has secondary public DNS always at sometimes have a competing entry for this zone?

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• Programmatic DNS

  - by Chad

  I'm a long time developer but not very experienced with DNS. Here's my problem: Our app launches servers on Amazon EC2 for clients. One client wants to use custom DNS's for every server launched instead of the normal long public DNS provided by AWS: for example server-5.demo.ourclient.com, server-6.demo.ourclient.com. What's the easiest/cleanest/best way to solve this challenge from inside our application that launches the servers and knows the Amazon public DNS? We can probably get control of demo.ourclient.com as well.... Are there nice hosted solutions with API's? Would we need to manage a DNS server for *.demo.ourclient.com? Thanks! Chad

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• Per-machine decentralised DNS caching - nscd/lwresd/etc

  - by Dan Carley

  Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our servers. This works well. Except that a vast quantity of the requests seen over the wire are lookups for the same records, generated by applications which don't perform any DNS caching of their own. Questions: Is there a significant benefit to running lightweight caching daemons on the individual servers in order to reduce repeated requests from hitting the network? Does anyone have experience of using [u]nscd, lwresd or dnscache to do such a thing? Are there any other packages worth looking at? Any caveats to beware of? Besides the obvious, caching and negative caching stale results.

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• dns server bind is not work

  - by milad

  I just installed bind on RHEL 6 and point a domain to that server. but actually when i ping domain it returns error 1214: Here is my named.conf: // // named.conf // // Provided by Red Hat bind package to configure the ISC BIND named(8) DNS // server as a caching only nameserver (as a localhost DNS resolver only). // // See /usr/share/doc/bind*/sample/ for example named configuration files. // options { listen-on port 53 { any; }; listen-on-v6 port 53 { ::1; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; memstatistics-file "/var/named/data/named_mem_stats.txt"; allow-query { any; }; recursion yes; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; managed-keys-directory "/var/named/dynamic"; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; zone "." IN { type hint; file "named.ca"; }; include "/etc/named.rfc1912.zones"; include "/etc/named.root.key"; zone "mydomain.com"{ type master; file "/var/named/data/named.mydomain.com"; allow-update { none; }; };` AND The content of "/var/named/data/named.mydomain.com": $TTL 38400 mydomain.com. IN SOA ns1.mydomain.com. milad.yahoo.com. ( 2012101201 ; serial number YYMMDDNN 28800 ; Refresh 7200 ; Retry 864000 ; Expire 38400 ; Min TTL ) mydomain.com. IN A 1.2.3.4 www IN A 1.2.3.4 ns1.mydomain.com. IN A 1.2.3.4 ns2.mydomain.com. IN A 1.2.3.4 mydomain.com. IN NS ns1.mydomain.com. mydomain.com. IN NS ns2.mydomain.com. AND i'm sure the named service is running: [root@server ~]# service named status version: 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.3 CPUs found: 8 worker threads: 8 number of zones: 20 debug level: 0 xfers running: 0 xfers deferred: 0 soa queries in progress: 0 query logging is OFF recursive clients: 0/0/1000 tcp clients: 0/100 server is up and running named (pid 26299) is running... Thanks for your answers. i know that the ping is not the job of bind, i use it just to check whether domain is pointed to host or not.(ping is open in my server as i got reply in pinging ip) i use network-tools.com to ping domain. here the output of dig utility: dig mydomain.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.3 <<>> mydomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 6806 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;mydomain.com. IN A ;; Query time: 321 msec ;; SERVER: 5.6.7.8#53(5.6.7.8)##note that 5.6.7.8 is my idc dns ip ;; WHEN: Sun Oct 14 23:53:47 2012

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• Can I mix and match rack mount servers?

  - by Zubair

  I want to know if all vendors rack servers are compatible with all rack chassises?

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• Hidden DNS master only sending notify to one slave

  - by Rob

  My hidden DNS master is only sending notifies to one of the name servers for a zone I have 3 named servers ns0,ns1 & ns2 all running bind 9.7.3.dfsg-1ubuntu4.1. When an update is processed the master (ns0) seems to behave normally. ns0 (192.168.2.50) zone domain.org/IN: sending notifies (serial 2012060703) client 192.168.2.52#42892: transfer of 'domain.org/IN': AXFR-style IXFR started: TSIG rndc-key client 192.168.2.52#42892: transfer of 'domain.org/IN': AXFR-style IXFR ended ns2 (192.168.2.52) client 192.168.2.50#3762: received notify for zone 'domain.org': TSIG 'rndc-key' zone domain.org/IN: Transfer started. transfer of 'domain.org/IN' from 192.168.2.50#53: connected using 192.168.2.52#55747 zone domain.org/IN: transferred serial 2012060704: TSIG 'rndc-key' transfer of 'domain.org/IN' from 192.168.2.50#53: Transfer completed: 1 messages, 34 records, 1028 bytes, 0.001 secs (1028000 bytes/sec) Nothing happens on ns1. I've turned up the logging level but there's no information in syslog about the actual name servers bind has sent notifications to so I guess this is something it doesn't log. I've also tried watching tcpdump, it never makes any attempt to notify ns1 only ns2 192.168.2.50.56278 > 192.168.2.52.53: [udp sum ok] 56418 notify [b2&3=0x2400] [1a] [1au] ? SOA? domain.org. domain.org. [0s] SOA ns1.domain.net. dnsmaster.domain.net. ? 2012060801 10800 3600 604800 3600 ar: rndc-key. ANY [0s] TSIG hmac-md5.sig-alg.reg.int. fudge=300 maclen=16 origid=56418 error=0 otherlen=0 (174) the authoritive zone has both ns1 and ns2 records $ORIGIN domain.org. $TTL 3h @ IN SOA ns1.domain.net. dnsmaster.domain.net. ( 2012060801 ; Serial yyyymmddnn 3h ; Refresh After 3 hours 1h ; Retry Retry after 1 hour 1w ; Expire after 1 week 1h ) ; Minimum negative caching of 1 hour @ 3600 IN NS ns1.domain.net. @ 3600 IN NS ns2.domain.net. // Edit I have added also-notify {192.168.2.51;192.168.2.52;}; explicitly to the zone file and it all works fine, both ns1 and ns2 get notify messages and transfers succeed. I was under the impression bind would automatically send notifies to all NS records on a zone, maybe it's bugged?

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• How to test DNS glue record?

  - by Sunnz

  Hello I have just set up a DNS server for my domain example.org with 2 name servers ns1.example.org and ns2.example.org. I have attempted to set up a glue record for ns1 and ns2 at my registrar. It seems to work for now when I do a dig example.org but when I do a whois example.org it lists ns1.example.org and ns2.example.org but not their IP address which should be set up as a glue record. So I am wondering how do I check for the existence of a glue record? Do I do it with whois? I have seen .com and .net whois records that have both the domain name as well as the IP address for the name servers, is .org different? What's the proper way to test this? Thanks.

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