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

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0
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2answers
55 views

Possible reasons for occasionally inaccessible domains

I'm experiencing symptoms similar to those of the other question. That is, peoples are complaining about a domain name being inaccessible. And then, it suddenly starts working after a while. But I ...
0
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1answer
15 views

Network two vm's on one host machine whether on or off the network domain

I have a corporate network with the ip addressing range of 192.168.0.x I have a host machine (a mac) which when on the network gets it's ip's from dhcp. On the host machine i have 2 Virtualbox ...
1
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3answers
72 views

Dynamic DNS Registration over VPN?

In our Windows AD domain, we have 2 DCs that also act as our DNS servers which allow the client computers to update their A records. We have a lot of outside salespeople, so some of our laptops have ...
0
votes
1answer
48 views

Do reverse entries for name-server, need to match the mailserver name?

I need to setup PTR for a domain and lets say my domain is domain.com and I have my email addresses like email.address@domain.com. I came over this mailing-list article that says: The reverse ...
0
votes
1answer
15 views

Server 2012- Installed DNS Role but DNS Manager not showing up in Tools

I have a Windows Server 2012 (In Virtual Box) setup with a DNS Role. In the server manager, DNS shows up on the left hand selection. However, DNS does not show up in the Tools.
2
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2answers
47 views

How Active Directory Dynamic DNS updates works behind the scenes?

I've looked through the AD documentation and I was not able to find any conclusive answer to this question. It's plain simple, but hard enough to be answered. How DDNS of AD works behind the scenes? ...
2
votes
1answer
42 views

Setting up a domain controller in an Azure Virtual Network, how should I configure the DNS Server List?

I've set up a simple Azure Virtual Network (VN) consisting of a single domain controller and a few clients. Now I need to know how to configure the VN's DNS Server List. Here are the two options I've ...
0
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0answers
21 views

Azure configure a VM for DNS name resolution across multiple Cloud Services

I am trying to setup an azure VM with proper DNS to allow multiple cloud services to communicate across cloud service boundaries. As I understand it, I need to provide my own DNS server. I do not ...
2
votes
2answers
1k views

How to setup redundant dns and dhcp servers with automatic dns updates on Ubuntu?

I'm trying to configure two virtual servers running Ubuntu to act as primary and secondary DNS and DHCP servers in my lan. I was able to get bind9 working as master and slave DNS servers. I was able ...
1
vote
3answers
889 views

Setting up BIND with wildcard nameserver

I'm looking to set up BIND to return the same IP address for every A record, no matter what the request is. It's working based on the configuration below, however what is not working is that the ns ...
0
votes
1answer
25 views

Problems with CNAME In GeoDNS Setup

I'm trying to setup something similar to a CDN (Content Delivery Network) setup. What I want to do is use DNS records that return an A record based on where the user is geographically located. I was ...
4
votes
2answers
3k views

AWS EC2 dns resolution diagnostic

I am using EC2 instances with amazon linux installed (with amazon dns server settings, which comes from DHCP), as well as an RDS database. The EC2 instances are behind ELB and get high traffic. The ...
0
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0answers
44 views

webmail access when website hosted elsewhere [on hold]

I have a reseller account (VPS) with GoDaddy, and I do have root access. My issue is that I use this primarily for email, since the websites are hosted elsewhere by industry "experts". I have ...
0
votes
0answers
24 views

Windows Server 2012 R2 Standard located in our DMZ has problems with connection to RoDC

We had an environment with multiple 2008 R2 DC:s in our internal LAN and a 2008 R2 RoDC:s in our DMZ. We set up 2008 R2 servers in our DMZ and joined them to the domain using DJOIN. Everything ...
1
vote
1answer
411 views

Why does nslookup return two or more ip address for yahoo.com or microsoft.com?

I am newbie with dns What is the exact reason that some sites report two or more ip address while others report single ip? 1) Is it feature or error in configuration? 2) Is it something related to ...
1
vote
1answer
28 views

Redirect traffic from one server to something.cloudapp.net (CNAME) [on hold]

Through out North America, we have lots of legacy devices, which sends data to our server which has static IP Address. Now we are moving to Azure cloud services, and as you know they do not guarantee ...
-2
votes
0answers
29 views

Optimzing Web Server [on hold]

I'm trying to increase connection speed and at the same time reduce server load for my web application. I'm looking at setting up something similar to a CDN (Content Delivery Network) but that's able ...
2
votes
2answers
136 views

Forward all TLD requests to another server

So, an emergency has been landed in my lap, and unfortunately I'm ill-equipped to deal with it. An IT tech for a client's company changed the A record for a domain, then went on holiday. He is the ...
0
votes
2answers
716 views

PHP/cURL/Fedora issues resolving hostname possibly a DNS problem?

I have the following simple test script for cURL/php on a FC12/apache server that has PHP 5.3.2, cURL v7.19.7 (according to phpinfo()): $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, ...
6
votes
3answers
5k views

How to configure email autoconfiguration for a domain?

Outlook and a number of other email clients now feature autodiscovery of mail server settings and it bugs me that I don't have this set up for our domains, but I'm not sure how to do it and a quick ...
1
vote
1answer
2k views

Bind FORMERR errors in syslog

I've recently switched out a failed router... and, a while later, I discovered a lot (at least an order or magnitude more than the number of queries) of errors reported in /var/log/syslog - of the ...
-3
votes
1answer
40 views

Namservers (NO GLUE) on .EU domain [on hold]

I have two cPanel accounts with two different domains. one is sunrisetrip.com and the other sunriseholidays.eu. Both have the same nameservers, both are bought from the same registrar. the .com domain ...
6
votes
3answers
188 views

How to prevent Bind from responding to spoofed IP addresses?

We all know about open resolvers, this question is kind of for the inverse situation. I have a DNS server that is locked down to certain CIDRs acl trusted {[..] options { [..] allow-query { ...
1
vote
2answers
2k views

Windows 2008 DNS Export all A Records

I know about dnscmd /enumrecords, however what I want to do is export all records from every single zone housed on this server. I was hoping there was a simple recursive function to do this. We have ...
4
votes
2answers
208 views

Nameserver working for all TLDs except .org

I've recently set up a private name server (ns1.mediamechanic.net / ns2.mediamechanic.net), and it appears to be working for everything except our .org domains (see obapps.org). As far as I can tell, ...
1
vote
2answers
27 views

Postfix sending and receiving in strange way.

I have an email server, running on CentOS 6.5, 32bit system, with Postfix and Dovecot running along all their dependencies. Let's assume my domain is www.anw.com I have created A record in this ...
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votes
2answers
19 views

Handling emails in a separet email servers [on hold]

This is a problem about maintaining an all-email VPS server. First, I have two VPS hosts right now, both running CentOS 6.5, 32bit system. one for web hosting and other for email only. The reason ...
0
votes
1answer
28 views

Installed RBLDNSD for making a custom RBL but something is missing, could you help us?

We have successfully installed RBLDNSD with the idea of having a custom RBL server. Now we have started to make some testing adding some IPs to the our blacklist, and also have configured Exim (Cpanel ...
-1
votes
1answer
13 views

Custom domain, DNS A Record Breaking old URL Paths [on hold]

I'm working on for a client and we created a website using a CMS template called Virb.com (sort of like squarespace.com). To get his custom URL to link to his new website, we needed to change an A ...
1
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0answers
26 views

DNS Registration Using Non Windows DHCP

We are searching for a solution for our VPN users. We use a Fortinet SSLVPN. The Fortinet appliance issues DHCP to our clients. It is configured to have the clients use our internal Windows DNS ...
1
vote
1answer
71 views

Fix slow SSH login due to reverse lookup without disabling UseDNS

Whenever I try to connect to my server from Azure VM it takes a lot of time due to failing reverse DNS lookup. I can disable lookups with UseDNS no and completely bypass the problem but this makes ...
0
votes
1answer
17 views

Windows DNS dnscmd.exe SecureList syntax

DnsCmd let's you provide a list of nameservers to allow for secure zone transfers, however providing a list like 127.0.0.1 10.0.0.2 10.0.0.4 causes the machine to consume memory and CPU until it ...
7
votes
8answers
6k views

Why can't some websites be shown without the “www” in the URL?

I used to type the website URL without the "www" and it works fine with almost all sites that I have tried, so far. But I realize that my university's website never show up if you don't type the ...
0
votes
2answers
44 views

How does Cloudflare know about my Subdomains?

I just signed up Cloudfare and they showed me a list of my subdomains by scanning my domain. How do they do this? What technology is used to scan all subdomains related to a root domain?
0
votes
0answers
14 views

Second FTP Server On Subdomain [closed]

I've my own domain name that I'm trying to set up with two FTP servers. (I have two totally independent FTP servers I want to be able to access.) I set one to run on the standard port, 21, and the ...
-1
votes
0answers
48 views

IPTABLES: why does accepting outgoing DNS on port 53 bring down my websites?

I have a handful of websites running with Apache. I've installed Sendmail and am trying to configure IPTABLES to allow outbound emails. When I allow output DNS with the following command, I can send ...
0
votes
0answers
7 views

maraDNS NON-AUTH timeout

I've set up maraDNS to provide my own DNS records. I've pointed the domain nameservers at my registrar to ns1.domain.co.uk and ns2.domain.co.uk (using domain in place of actual domain name). I cannot ...
1
vote
2answers
23 views

Cannot access my GitHub Pages website by IP Address

My custom domain works with GitHub Pages but I would like to understand how it actually works. For this example I am not using my custom domain at all. My GitHub Pages repository does not ...
3
votes
2answers
46 views

Enumerate Windows DNS Server Zone attributes via shell

I'd like to use a command-line tool to list a (primary) zone's configured secondary servers, if any. Dnscmd comes close with: dnscmd server /ZoneResetSecondaries:[list of secondaries] But, I ...
0
votes
1answer
14 views

Bind Requested DNS Server IP Log

I have a DNS Server which runs on a virtual linux box with several IPs. Bind provides some pretty detailed debug logs, however, one piece of information that doesn't seem to be logged is the requested ...
1
vote
2answers
1k views

DNS (bind) : How do I redirect an http request to a different domain, based on the requested domain

I host my own DNS server and would like to be able to redirect links from within the DNS server so that redirection is seamless. Example: redirect all requests for www.yahoo.com to www.google.com. ...
0
votes
1answer
25 views

How to redirect custom urls to some local IPs with pfSense [closed]

I'm using a pfSense router and I'm desperately trying to configure a custom url (eg: myurl.ext) that should be mapped by pfSense to a local server (eg: 192.168.0.x). Like I do with my /etc/hosts and ...
2
votes
0answers
18 views

Domain Controller's DNS NIC configuration [duplicate]

I've seen conflicting information on this online, but say you have an environment with two domain controllers: one Forest, one Site, one Domain; simple as it gets. How should each domain controller's ...
0
votes
1answer
43 views

Forwarder dns not resolving reverse lookups

I have created one new dns server in lab and its working properly. Earlier we were using another dns server for lab pc's as 10.20.30.xx. which is outside the lab premises. now issue with newly created ...
1
vote
2answers
34 views

Vanity name servers with .no domains

I created vanity name servers e.g. ns1.example.com and ns2.example.com that are just maskеа and are pointed to rackspace free dns service. In other words ns1.example.com points to ...
0
votes
5answers
264 views

Allow external domains to use my nameserver without using BIND

Is it possible to allow users to point their domains to my nameservers from their domain provider, e.g. GoDaddy, 123-reg, etc. For example, they enter my nameservers: ns1.domain.com, ns2.domain.com ...
1
vote
1answer
20 views

Locally resolve a name in a DSN lookup (Host not found: 3(NXDOMAIN))

I have a Ubuntu 14.04 Server virtual machine in which I would like to resolve a symbolic name to an IP address locally (i.e., the machine itself should provide the mapping). The mapping is the ...
0
votes
1answer
23 views

Delegate NS resource record of IPv4 subnet

Is it possible for a reverse zone to name another DNS server in the NS record? I want to delegate DNS for all addresses within a subnet to a site using that subnet. Our office leases a subnet which is ...
2
votes
3answers
9k views

Conditional DNS forwarding with named on Linux

I have a Centos 5.2 server which runs named for DNS resolution - it doesn't hold any information of its own, and just forwards all requests. From the named.conf: options { [...] forwarders ...
-1
votes
1answer
38 views

Way to find all domains that have a CNAME to my domain? [closed]

I have a web service that allows users to white-label our software by using their own domain over ours. This is done by the user adding a CNAME record from their domain to our domain. Is there a way ...