DNS stands for the Domain Name System, a hierarchical, distributed database where the keys are domain names.

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bind “can't find example: SERVFAIL”

I'm trying to setup a dns server on my LAN because my router doesn't support nat reflection and I have virtualhosts which require a domain (can't be reached by IP address) running on apache. I'm not ...
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16 views

DD-WRT to push alternate Name Servers to clients over DHCP [migrated]

In order for WiFi DHCP clients to use directly 8.8.8.8 and 8.8.4.4 as name servers, DD-WRT has been configured as follow add dhcp-option=6,8.8.8.8,8.8.4.4 in /etc/dnsmasq.conf (reboot) since that ...
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5 views

Resolving DNS lookup when using a proxy on a adhoc network [migrated]

I have a network with the following setup: Box A(client) has a local HTTP/S proxy running Box A is set to use 0.0.0.0:7777 as a HTTP/S proxy The proxy service forwards all traffic to box B(proxy) ...
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2answers
71 views

How do I understand my CPU usage on a DNS server?

I have read and understood Can you help me with my capacity planning?, but I'm not sure I understand what my next steps are in a DNS server scenario. I think my CPU loads are high or that I might be ...
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1answer
39 views

What are the security implications of the “Allow DNS Suffix Appending to Unqualified Multi-Label Name Queries” setting?

The Allow DNS Suffix Appending to Unqualified Multi-Label Name Queries group policy was introduced in Windows Vista, and blocks the behaviour of child subdomains being tested against domain suffix, ...
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52 views

How do you load balance a forwarding only server… with no authoritive zones?

New Thought and possible answer to my Question? Would it be possible to change the root config file (the db.root with A/B/C/D/E/F/etc.ROOT-SERVERS.NET) and remove the original entries (i.e: ican ip ...
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1answer
43 views

How to change hostname without reboot? [closed]

I follow the instructions in http://askubuntu.com/questions/87665/how-do-i-change-the-hostname-without-a-restart. The host name is changed correctly when I verify using "hostname". However, there is ...
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2answers
49 views

Domain not resolving from some locations

I need help collecting some sort of proof of what might be wrong here Problem description location 1 Ping <domain.net> Ping request could not find host <domain.net>. Please check the ...
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2answers
63 views

what does this mean Superfluous name server listed at parent: ns52.domaincontrol.com?

I get this message from pingdom Superfluous name server listed at parent: ns52.domaincontrol.com A name server listed at the parent, but not at the child, was found. This is most likely an ...
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2answers
15 views

Bind dont forward to secondary dns server as specified in “forwarders” under named.options.conf

I have bind9 setup to forward dns queries to machines connected localy trough the 192.168.1/24 network. The ip's that I forward the queries to are also my internet gateways. Sometimes one of the ...
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1answer
43 views

Using different NS servers for each subdomain

My current DNS is managed by CloudFlare, but sometimes I want to take more control on like url forwarding or use with samba for inhouse address resolution. How am I supposed to do this? My Schema: ...
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41 views

APIPA Address Showing for DNS & WINS Server 2012 r2

Background I just finished setting up a Server 2012 r2 install. It is the only server in the forest and I am only utilizing 1 NIC (it has two, but the second is disabled). It is the DC and handles ...
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1answer
36 views

Port 53 in Amazon Security Group

Everything works as expected. This question is for learning purposes only. Using Amazon Security Groups in a VPC. Outbound rules are: 0.0.0.0/0 Port 80 0.0.0.0/0 Port 443 Iptables allows OUTPUT ...
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0answers
9 views

I just moved entire website to a new server, but am still getting traffic to my old one (caching issue?) [migrated]

I just sold a website, so I transferred everything to new owners' server. The name servers are now pointing to his server as well. I also replaced all of my Adsense tags with the buyers'. However, I'm ...
1
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1answer
55 views

Debian/Apache2 server is blocking my IP

There is a Debian 6 LAMP server and from about one week I have a problem which occur randomly. From time to time I can't access one specific domain from one specific location (IP). Our employes from ...
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23 views

How can a domain's NS records point to a subdomain of itself? [duplicate]

As I understand that if I have domain A.com, it must be managed by another domain like ns1.B.com, ns2.B.com $ dig ns alibaba.com ; <<>> DiG 9.9.2 <<>> ns alibaba.com ;; ...
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34 views

How do I give each Virtual Host in Apache a domain name on a local network?

Background information. I have a server (running Debian Wheezy and Apache 2) at which I am to set up several Virtual Hosts to allow students to host their own website for development purpose. I am ...
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1answer
15 views

Is it possible to have multiple domain which point to a server with different ports? [duplicate]

I have a server, running multiple instance of tornado web sites on different ports. for example: 127.0.0.1:8000 127.0.0.1:8001 127.0.0.1:8002 Is it possible to assign each one a domain?
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1answer
27 views

Email for openshift application [closed]

As far as I know,OpenShift (free) don't have email server (That's right?). Can I add a mx record to domain (have Cname record to openshift application) and use another server to send and receive ...
2
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1answer
40 views

Performance-wise, is a DNS Slave better to have than two duplicate Masters?

I have two bind9 servers that are not setup with duplicate settings and know nothing about each other. Our CPU usage is sitting around 7% - 10%: mostly bind, which I believe is perfectly in range for ...
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2answers
147 views

Setup alternative DNS entry while DNSimple is down for DDoS?

Have an app on Heroku with domains registered with DNSimple. DNSimple is undergoing DDoS for hours. (Sharing the naked heroku URLs with users is almost workable, but not an option as the OAuth ...
2
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1answer
79 views

VMware ESXi: dynamic registration in DNS fails

I installed an ESXi server 5.5 in our test lab. Everything runs fine, the VMs I host on the server are able to do dhcp and get registered in the DNS. But I am unable to register the ESXi host itself. ...
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1answer
31 views

How to use CNAME to external hosts on local DNS Server?

I have a domain mydomain.com and I'm using an external DNS Server to resolve some names like www.mydomain.com and webmail.mydomain.com on Internet. Now, I need to create a rule, only on my LAN, to ...
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1answer
22 views

How to redirect a url to development environment in Organization Network

In my organisation we have nearly 100 people but we dont have any dedicated IT Staff to manage our network. We have one of our product running on a domain name http://www.domainkachra.com. We want if ...
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13 views

setting up DANE fails, error with “could not get cert chain from ssl”

I successfully setup DNSSEC and enabled it on my domain. I'd love to make use of my DANE. I created a standard self signed certificate openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem ...
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29 views

How to publish hostnames of Ubuntu machines using Avahi

How do you configure Avahi on Ubuntu to automatically broadcast and discover the DNS info for each Linux server on a local network? I've ran this on my localhost (hostname mylocalhost) and a test ...
2
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1answer
89 views

How to get authoritative answers from nslookup? [closed]

Why is it "Non-authoritative"? Even when I look for yahoo.com ip with ns3.yahoo.com I get Non-authoritative answer. Why does a yahoo server keep stackoverflow's ip? From where do I get ...
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39 views

DHCP Server configuring

I've been configured DNS and DHCP on Windows Server 2012 correctly. But when I open the DHCP server from start menu and server manager, I get different result. When I run DHCP manager from server ...
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1answer
30 views

Windows DNS not picking up change to external website A record

I have pointed an external website to a new IP address. When I query the domain from an non-networked computer or device it picks up the change. I've run dnscmd /clearcache on both DCs several times ...
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24 views

NSLookup failed on ubuntu 14.04

im fairly new to server administration and just set up an ubuntu 14.04 system running Plesk 12. That all worked out fine, so I started to configure the UFW to allow all ports needed for the plesk ...
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1answer
58 views

Load times of S3 Static Website

We have recently decided to move our static single page website to AWS S3, the previous server was hosted by Godaddy(cpanel) in singapore. We are using Synthetics New Relic to monitor our website and ...
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2answers
161 views

Why does my linux server resolve all domains (even non-existant ones)

Currently every domain name resolves to my primary server, primary.example.com. So for example, if I ping randomdomain123.blah I get: PING primary.example.com` (1.2.3.4) 56(84) bytes of data. but ...
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2answers
32 views

Bouncing email due to bad initial MX TTL?

Last Friday night we changed mail servers. We moved off Office 365 to another hosted Exchange Solution (Intermedia.net). We use Godaddy for DNS, and after the server migration stuff was ready and ...
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2answers
57 views

Public overrideable DNS [closed]

I have a peculiar use case in which I want to override the public DNS mapping for a specific domain alone. The domain does not belong to me. I have currently setup a BIND DNS server which forwards ...
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54 views

NetBIOS ping issues

I am having an issue with NetBIOS Pinging. When I ping a PC/Server on the network with its NetBIOS Name I am finding that the PC/Server is getting associated with an IP address outside my network (IP ...
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1answer
28 views

Outlook reports “no default gateway” on Lan Domain [closed]

I have a local domain with DC win2003 and an exchange server also added to the domain. When I connect a pc to the domain and put the ip , mask and DNS (the same as DC), outlook dont get directly the ...
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1answer
33 views

What do the + signs do in these DNS TXT records? [duplicate]

Is there a specific reason why some records contain the '+' sign and others do not? Are these handled similar to a common search function where you can preface terms with + to include them, but it's ...
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1answer
35 views

Windows server DNS resolves localhost for (some) foreign IPs

I have 2 Windows Server 2008 R2 DNS Servers which share the domain xyz.wan and reside in the 192.168.50.0/24 subnet of my network. Connected via IPSec VPN site-to-site are some other subnets ...
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39 views

Docker debian slow dns resolve

I got terribly slow dns resolve inside my ubuntu when using wget or curl, apt-get,... root@815340a37f0e:/# time curl www.google.com ... real 0m5.132s user 0m0.006s sys 0m0.003s When I do ...
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29 views

my sub domains vanish with time

I have a server running bind9. When the propagation is done and i ping domain.tld i get xx.xx.xx.xx (where xx.xx.xx.xx is the server IP), if i ping test.domain.tld i get xx.xx.xx.xx, at this point ...
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1answer
32 views

Is SPF record necessary for single domain IP?

My question is simply this - I have a domain where all the DNS records to a single box. Do I need to setup an SPF record in this instance as SPF is designed for where a different IP is sending emails ...
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51 views

Big Trouble with (I think) Outlook X500 addressing

I moved a small client from one hosted Exchange server (Microsoft Office 365) to another (Intermedia.net). Some emails from External senders to the users on the new server host are undeliverable, ...
10
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1answer
166 views

Active Directory forest with same name as root DNS zone and browsing to site with same name

Related to this previous question of mine about why it's a bad idea to use the root domain name as your Active Directory forest's name... I have an employer, whom I will refer to as ITcluelessinc, ...
3
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1answer
63 views

How to determine where an IP returned by NSLOOKUP is coming from

We have a Windows 2012 AD environment with two domain controllers. We have a mac workstation which has an IP of 10.8.214.30. It resolves fine and pings fine, but when you do an nslookup you get the ...
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1answer
26 views

DNS format error in syslog, how to debug?

I'm getting an error in my syslog when resolving a domain I also the DNS for. Nov 24 21:51:55 moo named[4075]: DNS format error from 192.227.143.105#53 resolving bostonyoungentrepreneurs.com/NS for ...
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2answers
107 views

Managing IPv6 rDNS

Still very new to IPv6 and I talked to my datacenter and they do not do rDNS for IPv6. Unfortunately we currently do not support rDNS for IPv6 allocations. We can however delegate the IP block ...
2
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0answers
36 views

What does a healthy CNAME to an S3 web access bucket look like? [duplicate]

I have feed.foodschmood.com configured according to Amazon's instructions (a CNAME to one of their endpoints, which is itself a CNAME), but I'm skeptical that this is a "proper" configuration. ...
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2answers
32 views

How do I secure a zone with dlv.isc.org's DLV service? [closed]

I'm setting up domain-lookaside validation. I think I got mostly everything correct. I followed the directions here: https://dlv.isc.org/about/using. I registered my domain and uploaded the key ...
2
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1answer
45 views

Cannot load reverse lookup zones containing “rich-text” PTR records

Summary I am attempting to set up Wide-Area Bonjour (aka DNS-SD) using ISC Bind 9.9.5, but cannot load reverse lookup zones providing discovery of "rich-text" service domains. Background According ...
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24 views

How to configure an additional BIND instance for a domain already described by other public name servers?

Background I have a small virtual server hosted by my provider and there I have configured a relatively simple combination of postfix, dovecot and roundcubemail (backed by nginx) that works OK. I ...