The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names.

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Fault-tolerance/Failover in school project

I'm taking a course on distributed architecture. The course participants are divided into groups. Each group must develop an MMORPG-type console game and set up the infrastructure. The lecturer has a ...
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1answer
10 views

BIND: How to refer requests to other DNS servers in different predefined networks [duplicate]

Let's say I have two independent networks net1.local and net2.local each of which is connected to a bigger network local through a router. Each of 3 networks have their own independent DNS server. ...
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12 views

iptables to redirect DNS queries on bridge

Setup: Router -> (eth0)Server(eth1) -> Switch -> devices #/etc/network/interfaces auto lo iface lo inet loopback iface eth0 inet manual iface eth1 inet manual #allow-hotplug br0 auto br0 ...
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2answers
21 views

How to configure AWS Route 53 to get equivalent of domain forwarding with masking

(I apologize in advance for not having enough technical depth to ask this intelligently) I currently have an AngularJS static website hosted on AWS S3. I'm using AWS Route 53 for DNS. I'm able to ...
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0answers
24 views

An application running on a client is phoning home

Hi! I have a client running an application which takes aprox 1 minute to start when on my LAN. If i remove the network cable the application instantly starts. Wireshark confirms that the app is ...
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1answer
21 views

openVPN - Client DNS queries

I have an openVPN server using a routed TUN setup. server.conf topology subnet server 10.8.0.0 255.255.255.0 push "redirect-gateway" push "route 10.0.0.0 255.255.255.0" push "dhcp-option DNS ...
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8 views

Whenever I try to reach saddahaq.com I am getting a Server Not Found issue. Everyone except me is able to reach that website [migrated]

I am using Ubuntu OS and Google Chrome browser - Version 44.0.2403.157 (64-bit). i searched for the solution, i tried these check the website is blocked in hosts : /etc/hosts its clear nothing wrong ...
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1answer
32 views

How Does A Domain Name Know Which Account Is Yours In A Nameserver [on hold]

I have registered for a domain name at Netfirms and have signed up for a web host at iPage. From my understanding, I would provide Netfirms with the Nameserver from my web host. The Nameserver is ...
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1answer
20 views

iptables setup for bridge, redirect dns traffic

I am trying to forward dns traffic on a bridge to a local dns server and it wasn't working. As a thought exercise I decided to block all traffic and that too isn't working. Here is my setup : ...
3
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1answer
146 views

IP address is not allowed to send mail from DOMAIN

Today I heard that a customer can't send email to us. He received the following error: < #5.5.0 smtp;550 [ipaddress] is not allowed to send mail from [domain name]. Please see ...
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1answer
28 views

Changing DNS records when Moving a site

I'm building a new Magento website on a Amazon ec2 instance and will need to point domain of their old OSCommerce site to the new ec2 instance's elastic IP address. Normally I would have though this ...
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20 views

Windows wildcard dns resolution

I've setup a wildcard CNAME entry as an alias for one of my servers that looks like this: *.custom.example.my.home When I try to resolve matching entries without specifying the domain (e.g. ...
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1answer
20 views

Domain does not resolve - error message from receiving MTA

For the first time in my life, I am the owner of an "unsupported" dedicated server, hosted in Europe, I am in Zimbabwe. I transferred various domains from a VPS to this new server, apparently pretty ...
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2answers
25 views

Create multiple email-server names

My email server has two domains and the email hostname for each of them is mail.domain1.com. I'm attempting to remove the 'mail' in mail.domain1.com for domain 1 and set domain 2 to domain2.com. So ...
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0answers
23 views

Use client ip adress from server

How would you do this: You have a server with a website, and this website offers a service to log in to a few other online accounts on behalf of a website visitor. The only problem is maintaining the ...
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0answers
8 views

dns SRV lookup with sip.js

I am trying to use sip.js to make video calls using WebRTC. Our video engineer told me that we need to perform a dns srv lookup before connecting. Here is what I have: var uri = new ...
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0answers
16 views

Server 2008R2 DNS Server missing objects

I have a domain controller running Server 2008R2 that is missing objects in the DNS server. It has trouble with active directory as a result. I'm looking for assistance replacing these objects? ...
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2answers
32 views

BIND v9.9.7, Views and includes

I have recently begun upgrading to bind 9.9.7 and have run into an unfortunate stumbling block with bind. I setup views in my environment to allow me to differentiate 4 of my zones with different IP ...
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1answer
24 views

Bind: Disabling DNS forwarder won't block resolving out-of-network names

I have disabled my local network DNS forwarder. But somehow internet names are still get resolved. Any idea how to stop this from happening?
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2answers
58 views

Why do you need the awverify CNAME record for Azure?

See i.e.: How to set up CNAME to point to Azure or the text within the azure portal: Why is this necessary in the first place? Why does pointing the domain name through an A record not prove that ...
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1answer
34 views

Is worrying about too many CNAMEs a micro optimization?

We have a whitelabel platform and I'm thinking about making one of my 'lower' domain names an A record instead of a CNAME, because I'm worried about too many cname redirects. The whole stack would be ...
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2answers
27 views

Does a client cache the IP of a CNAME DNS request or the other domain?

I am contemplating using two different DNS hosts and am curious as to how a client system would cache the CNAME record. The reason I am going this route is that a primary domain that I would like to ...
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25 views

Locked DNS settings on Netgear CG3700

I’m trying to use a specific DNS server with the Netgear CG3700EMR-1CMNDS modem/router. I was able to do so using this exact same hardware a few months ago, so it is possible that an update may have ...
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30 views

Domain Controller unable to authenticate Static IP workstation/server

I have an exchange server which was on a static IP (192.168.10.3) previously, failed to communicate with my all-in-one domain controller (192.168.10.2) out of a sudden. The only way to get it working ...
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1answer
19 views

Debian, DKIM and Exim4 never returns public key

i wanted to use DKIM in an exam mailserver on debian. My DNS settings are: @ IN TXT "v=spf1 mx -all" 27564764._domainkey.example.com IN TXT "v=DKIM1; k=rsa; ...
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2answers
45 views

Windows Server 2012 DNS forwarding

I have a problem while setting up DNS forwarding in Windows 2012 Server R2. The local network two AD servers running DNS servers at 192.168.0.10 (AD1) and 192.168.0.11 (AD2). Both DNSes have ...
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1answer
39 views

What's the difference between listing nameservers in /etc/resolv.conf and /etc/network/interfaces in Ubuntu 12.04?

I am deploying Ubuntu 12.04 VM's from a template using vCenter 5.5. When I try to add nameservers using a customization specification they are added to the resolv.conf file. The VM will not use these ...
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16 views

webmin - customize zone options in clustered slave servers? [on hold]

I'm currently running BIND as authoritative-only server on a few hosts, using webmin (self-hosted, no webhosting) to manage zone updates, configuration, etc. The setup is as follows: master ...
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36 views

Why does Google Chrome automatically add www. prefix for some websites but it does not add it for others? [migrated]

It adds it to my website but it does not add it to google.org for example. My website DNS records looks like the following: Host Name | IP Address/Url | Record Type | TTL @ | <server ...
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1answer
59 views

DNS Setting for POP3 and SMTP email [closed]

I'm new to server configuration, I have used rented webservers a lot, but I tried venturing myself with a VPS to run my own web/email server. All is good, I installed VestaCP to help me with dealing ...
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1answer
15 views

How to redirect one domain to the other with SSL?

I have two domains (example.com and example.co.uk). The .com one is the "head" and has servers behind him. What I want to do is redirect all traffic from the .co.uk to the .com domain. I looked at ...
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36 views

How to add new DNS entries for website

I have a registered site registerd under other Provider1 . I want to use it with Provider2 server for that I have changed mywebsites DNS at Provider1 hosting provider. second step I have create A ...
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1answer
28 views

BIND server has tons of “no valid RRSIG” errors

I have a forward-only BIND9 server running on the LAN and it logs hundreds of errors per day like: Aug 29 18:38:29 nuc named[850]: error (no valid RRSIG) resolving 'ubuntu.com/DS/IN': 75.75.75.75#53 ...
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EC2 + Cloudflare not working

[I speak Portuguese, English is not my native language - sorry for errors of writing.] I'm trying to set up Amazon EC2 with Cloudflare to more than one day. Already added all the information NS ...
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0answers
14 views

How to enforce dnsmasq to use internal dns for apex domain

We host example.com at Amazon and use Route 53 which works well outside VPN. From inside VPN we need to access to multiple internal subdomains, such as test.example.com, dev.example.com etc. which ...
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3answers
62 views

Cannot join client to domain (non virtual, DNS issue)

I'm running Windows Server 2012 R2 and have a Windows 7 Professional Laptop (non virtual, all physical) that I cannot join to the domain I created. I am trying to join the Windows 7 client to my ...
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1answer
35 views

DNS Forwarding to Google DNS - Should i be forwarding to my firewalls DNS or to googles or no forwarding at all?

While looking at some records in my firewall I noticed that I had an address that was consistently pinging googles dns servers. After checking my domain controllers I noticed they had forwarders ...
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1answer
25 views

How to link a tomcat application with ubuntu 14.04 server os on an azure server to dot tk domain?

how to link a tomcat application with ubuntu 14.04 server os on an azure server to dot tk domain? few doubts about azure vm: I can only find one DNS name e.g. abc.cloudapp.net, but dot tk DNS panel ...
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33 views

Domain email Configuration at Amazon EC2

I am using Godaddy as name registrar and also for email. I have hosting at Amazon AWS EC2. I have my domain pointing to Amazon AWS and now I can't open email using http//email.example.com, ...
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1answer
17 views

Public DNS server with dnsmasq works on LAN but not WAN (aws ec2 server)

I would like to setup a public DNS server that uses the server hosts file for certain domains, and then falls back on google's DNS for all other queries. At such, I setup dnsmasq with the following ...
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0answers
17 views

Heroku, Github Pages, and GoDaddy — Answer & Explanation Requested

I'm in a bit of an interesting situation. I have two sites that I have deployed in the last two days. The first is my personal website. I have a custom domain name for my site that is linked to my ...
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15 views

Resolve domain upon environment

I am using dnsmasq to resolve specific sites while doing some stress tasks, but since we have at least 3 environments per site I have to constantly update the target IP. These sites are behind a ...
2
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2answers
48 views

DNS not working on AD DC

I am an IT student setting up AD on a small computer lab. The lab's workstations are all connected to a switch, along with a server running Windows Server 2008 R2. I have installed AD DS and DNS on ...
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0answers
39 views

Amazon EC2 DNS resolve issue

I am using Godaddy as my Domain name registrar and I want to point my Godaddy Domain name to Amazon EC2 Instance ,I have hosting at Amazon EC2 . I am using Route 53 and I created one Hosted Zone for ...
3
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0answers
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Will KMS clients handle CNAMEs?

Will the various KMS client versions (Windows, Office) handle CNAMEs as expected (i.e. resolve the referenced destination RRs) when resolving the _vlmcs._tcp.<localdomain> KMS machine name from ...
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1answer
40 views

Linux PCs sending “ICMP udp port unreachable” to DNS server

So digging around in my syslog I have been noticing a lot of ICMP packets being flagged by our ASAs: %ASA-4-313005: No matching connection for ICMP error message: icmp src Internet:x.x.21.122 dst ...
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1answer
34 views

Why is sendmail calling dns_getcanonname for domains of non-recipients in the To: header?

We've noticed an occasional repeatable problem in our sendmail config. The scenario is we receive a message from the internet with one of our users in the To: list, and one of the other users in the ...
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1answer
20 views

Sub-domain forwarding (unconditional/wildcard)

I would like to forward all requests for domain.net to domain.com. The forwarding works only for the top level URL, meaning the server redirects domain.net to domain.com. However, any and all ...
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28 views

Windows 2012 R2 - DNS resolving to internal IP

I'm currently working on my infrastructure and since now it was good. I have a Windows 2012 R2 server on AWS, with a Elastic (Public) IP. I have 3 domain: domain1.com -> point to a CPanel ...
2
votes
1answer
27 views

New Domain DC Adds FQDN (including forest) to DNS - Cant Resolve

I added a new domain recently to our AD. It was added using the option to add a new domain to an existing forest. So now we have the original domain.local which is in the forest also called ...