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

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Parkingcrew.net hijacking our domain

we are experiencing a very bizarre sort of hijack on our domain www.lbps.co.uk It seems to render fine on desktop systems and on mobile devices over WIFI it also seems fine. However when WIFI is ...
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1answer
54 views

Why is host so much slower than dig on some queries?

When querying a particular address, dig as run against the resolvers listed in /etc/resolv.conf will return NXDOMAIN nice and quickly where host will take a while. $ dig @<resolver> ...
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0answers
60 views

Does AWS Elastic Beanstalk Swap Environment Url swaps environments for git push?

I have read the docs for zero downtime on aws but cant seem to understand what happens in this scenario? I have a environment running in production called 'red' I duplicate the environment as 'blue' ...
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1answer
41 views

Testing a mail server

Suppose you want to test a mail server for a particular domain before going live with DNS change. For example, when you want to test an HTTP/HTTPS site you can just change your own machine's hosts ...
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1answer
35 views

Nginx redirection to url writen in requested file

I need to setup dynamic redirections. For example, a user open a link : http://www.example.com/2/3/4/ and see the page on the following address: http://www.example2.pl/something. I know about ...
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1answer
222 views

postfix/smtpd[1337]: warning: hostname example.com does not resolve to address 93.184.216.119

I am having trouble figureing out what exactly the following error message means. It pops up in the logs whenever a mailserver from 192.168.x.x address is pushing mails. postfix/smtpd[1337]: ...
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0answers
22 views

ASA/AnyConnect will only allow 53/udp to the DNS servers listed in the profile

I found a "bug/feature" in Cisco AnyConnect/ASA 5510: if a VPN client makes a query to udp/53 (DNS query) to any IP address that isn't listed as a DNS server in the VPN profile, then ASA drops this ...
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1answer
53 views

Parked domains on Spamhaus DBL

I've set up a nameserver to park a bunch of my domains (similiar to sedo, bodis etc). Everything is working well. Unfortunately, all my parked domains are instantly listed at spamhaus (DBL). No mail ...
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1answer
34 views

DNS Zone manager - Server name and NS records mismatch. Pingdom errors

http://dnscheck.pingdom.com/?domain=leadassign.com&timestamp=1413917580&view=1 Lists errors: "Superfluous name server listed at parent: ns1.io-servers.com.", etc. I think its because in the ...
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1answer
209 views

Nginx dynamic proxy_pass doesn't resolve properly

I'm having problems configuring nginx, I've searched the web for solutions and I have some bits and pieces but I'm still not able to come up with proper configuration. I have registered a domain, ...
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0answers
48 views

Configure adapter setting to add loopback IP address to the list of DNS servers

I have Active Directory integrated DNS. I ran the Best Practices Analyzer (BPA) for DNS and received the following error: I have the following network adapters: I am not using the second ...
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1answer
22 views

DNS zone servicing concepts

Currently I am working out some concepts about how DNS works and am running into a question I can't easily find an answer to on the internet. I am looking for an answer based on a set of questions ...
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1answer
33 views

Setup DNS - different mailservers for different accounts on same domain

How to setup DNS so you can use multiple mail servers with both different mail accounts on them? Reason I ask is because I have gone from a mail server from a website-provider to a paid solution. Not ...
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3answers
60 views

understanding resolv.conf nameserver through system calls [closed]

I am trying to understand how /etc/resolv.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
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1answer
38 views

understanding resolve.conf nameserver through system calls [duplicate]

I am trying to understand how /etc/resolve.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
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2answers
75 views

How does my registrar (Namecheap) let me set up a CNAME record on the apex domain?

Namecheap seems to let me create a CNAME record on the apex domain, which I thought was contrary to the definition of a CNAME record: It works (correctly loading up my static site from S3). ...
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1answer
54 views

How to set up a DNS authoritative nameserver with just an IP?

I'm looking to set up my first DNS server, after having used registrar or web host provided DNS for years. It's going smoothly for the most part, but I'm having a bit of trouble understanding how to ...
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1answer
72 views

Different DNS lookup results for dig, nslookup, telnet and curl

I'm having a weird disagreement between a bunch of tools on my Debian 7 box about the IP adress a certain domain name should resolve to: $ dig www.ip-camera-beveiliging.com [...] ;; ANSWER SECTION: ...
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1answer
33 views

DNSSEC chain of trust

My test environment details are as follows :- I have fake-root server "172.16.93.193" DNS resolver "172.16.93.101" DNS server "172.16.96.93" I have already configured my resolver and it working ...
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0answers
33 views

nslookup gives timeout based on request - what gives?

I have the following strange problem with the DNS lookups in our Windows domain (dns service runs on the domain controller): from machine 'A': dns request for machines in the same network zone ...
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2answers
60 views

Bind DNS not working?

I Know there always lots of answer about Bind. But somehow I can't understand the problem of my settings. Here is my configuration options { listen-on port 53 { 192.168.159.130; }; ...
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1answer
924 views

BIND failing to resolve with 'WARNING: recursion requested but not available'

there are no errors in the logs and query logging won't initialize iptables is fully disabled but the server will respond with "WARNING: recursion requested but not available" because my client ...
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2answers
32 views

How to make a subdomain resolve the root domain

I have a domain, example.com that belongs to an Apache server. I want visitors to both us.example.com and cn.example.com to see what is seen when visiting example.com. The subdomain must remain ...
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1answer
43 views

How to set up 2 domain name pointing to 2 different folders on the same server?

I have 2 domain names registered. I also have 1 server at AWS. (running Ubuntu) I would like to host 2 websites on my server but have no clue how to do it. I have two directories /var/www/alpha and ...
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1answer
49 views

Setup cPanel to use MX records defined at domain registrar level (and not local MX records) [closed]

I use cPanel (without whm on this account) for a number of domains within the same account. For some of these accounts we are only using the related hosting for website hosting, the email is hosted ...
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2answers
91 views

Cannot resolve host as non-root user

I recently setup a VPS server running Centos 6.5 together with Web Host Manager. My current problem is that I can't resolve hostname either by nslookup or ping on the command line. But when I login ...
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50 views

CORS problems with DNS forwarding to AWS EC2 instance Atlassian Jira Tomcat

I have Atlassian Jira set up in a Tomcat server on my ubuntu AWS EC2 instance with a godaddy domain forwarded to an elastic IP on the EC2 instance. Looking at the console in Chrome, the JIRA ...
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1answer
48 views

DNS Lookup issue [closed]

A friend has a website and it seems there is now (for some reason) a problem with DNS resolving. If I nslookup domain.com I get a NXDOMAIN response, but if I do nslookup domain.com ns2.powweb.com I ...
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1answer
44 views

Custom TLDs, shortened URLs and usage

I'm curious about a few things with regards to TLDs and their allowed/semantic usage. I'm in the wine business and I currently own a .com domain. However the main domain name is quite long; not really ...
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1answer
53 views

Whatsmydns shows internal ip for class c whereas for class b it doesnt

I have a VMWare infrastructure and inside that 2 environments named A and B. "A" has its DNS in the server "D" whereas B has its DNS within itself. The scenario is as given below: A has domain ...
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41 views

DNS lookups occasional failing for subset of customers. Flushing DNS works - why?

From time to time I get customer support requests around connection issues they have connecting to my API. There seems to be a correlation with users moving outside of their normal routers or location ...
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1answer
92 views

Azure Shared Ubuntu VMs dns each other

I have two Azure Ubuntu VMs. Named: myweb01.cloudapp.net and mypg01.cloudapp.net. When I'm on myweb01 i issue an nslookup mypg01.cloudapp.net which fails: azureuser@myweb01:~$ cat /etc/resolv.conf # ...
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1answer
69 views

nsupdate failing on localhost - Bind 8

I have added a zone test.net via rndc locally and it is working fine. Next, I want to update it via nsupdate but locally, my zone configurations are, zone test.net {type master; file ...
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2answers
59 views

Mail don't reach server

I have VPS and serve several domains. DNS/MX config should be ok, as for *.com domains mails are both sent and received. Problem is with my country domain - *.hr (Croatia) - mails are sent, but ...
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1answer
39 views

Requests not arriving at my own nameserver

I want to handle the dns requests for my own domain. For example I have the domain dnsrequest.me and the nameserver is pointed towards my server 178.62.242.84 (whois confirms this). So when someone ...
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3answers
86 views

bind9 reverse zone dns config error - CNAME

i am trying to set up a reverse zone for my bind dns server, under the subnet 192.168.0.65/29 my zone datafile looks like this: @ IN SOA server.example.com. server.example.com. ...
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1answer
82 views

BIND: Forcing authoritative nameserver answer with no data on non-recursive requests (Research purposes)

Edit: I've simplified target goal as suggested by Andrew B. The goal is basically setting an authoritative name server to only give real answer on recursive requests, which means breaking the ...
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3answers
60 views

Make sure all users in network use my DNS server

I'm running a router with DNS server and I would like to make sure that everybody in my network is actually using my DNS. What are the necessary iptables (?) to redirect all DNS-related traffic to my ...
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2answers
48 views

SPF record setup ip4 or include

I have two domains (example.com 192.168.0.1 and example.net 192.168.0.2) and I want to allow example.net to send email from foo@example.com In my SPF I currently have: v=spf1 a mx ip4:192.168.0.1/32 ...
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1answer
113 views

Internal DNS doesn't work with CNAME

I have an internal DNS setup setup in my AWS VPC network, I just created an internal load balancer and added a CNAME record to this load balancer, but it's not working. DNS CNAME entry: db1 IN ...
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1answer
56 views

Computer can't resolve other computer names

I have a network with DHCP/DNS/AD setup with Windows 2012 server. Users cannot resolve computer names on the network without entering their FQDN, i.e. "server", but "server.domain.com" does. The only ...
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1answer
69 views

Windows Server 2003 not connecting to Internet

My Windows Server 2003 has two NICs, one for LAN and the other for dedicated Internet access. Suddenly, the Internet connection stopped working. It can ping itself and the hosts on the LAN. However, ...
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0answers
59 views

Change dnserror.htm page when cannot locate website in Internet Explorer via Group Policy

When you type in a URL in Internet Explorer and it cannot be located via DNS it loads dnserror.htm from a .DLL in C:\Windows\System32\en-US\ieframe.dll.mui. I have read that you can use a program ...
19
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1answer
703 views

How do I set up a “secure” open resolver?

This is a Canonical Question about securing public DNS resolvers Open DNS servers seem pretty neat and convenient, as they provide IP addresses that we can use consistently across our company ...
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2answers
78 views

Randomize DNS Nameservers

Is it possible to list multiple nameservers in /etc/resolv.conf on a Unix system and resolve dns queries using a random nameserver when making a dns query and not just the first one?
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1answer
28 views

Shared hosting - Subdomain without main domain

I’m looking to host a site that will be accessed through a subdomain (mysite.mainsite.com) of another site (mainsite.com). I have set the main domain for my shared hosting account as mainsite.com and ...
6
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1answer
323 views

Is there a downside to always updating DNS from DHCP?

I've got a Windows 2012 Domain Controller running DNS and DHCP servers. The default setting appears to be Dynamically update DNS A and PTR records only if requested by the DHCP clients. (This is ...
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1answer
86 views

bind9 proper recursion setup

If I remove recursion then I can't resolve external domains but can still resolve domains that are on the DNS server. What is the proper way to setup recursion correctly so external domains can still ...
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1answer
76 views

DNS server not resolving github page properly after two days

I had GitHub pages set up at mypage.github.io. I changed it to mynewpage.github.io with a new account and repository. I deleted the old CNAME and configured another CNAME in DNSimple to point to the ...
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1answer
38 views

How to redirect www to non-www globally in nginx?

I know how to redirect to non-www for a single site within nginx, but I have a lot of sites. So how can I do that globally for all of them?