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

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How can I prevent a second network interface from updating DNS with its IP address?

Recently I added a second network interface to my Domain Controller, and assigned a private subnet to provide a iSCSI volume for backups, but the IP address from this interface is being propagated to ...
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20 views

DNS Server Failure

I think I have an odd DNS situation on my hands. We have two Windows Server 2008R2 DNS servers that all of our campus machines use. We are unable to get to the site cdbaby.com in any web browser. We ...
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6 views

IBMi DHCP Dynamic DNS not communicating to DNS Server

I have a single IBMi server set up with a DHCP and DNS server running on it. I have set up the DNS forward and reverse zones for the local network to allow for dynamic updates, and I have set the ...
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2answers
30 views

my master dns is running on Debian, can i configure rhel as slave DNS

I need to configure a slave dns on RHEL 3 , but my master DNS is Debian 7, is it possible to configure dns on such manner if possible kindly help me on this
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1answer
23 views

Protection of a dns server

I recently started to host my own domains on my servers. I can already see a fair bit of bogus queries arriving to my servers. Some dns amplification attacks, etc. What can I do in order to further ...
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2answers
99 views

Can I set up conditional forwarding for a parent DNS zone?

If my domain is ds.usepowershell.com, can I set up a conditional forwarder for usepowershell.com and not redirect my internal queries (since technically, ds.usepowershell.com is a subdomain of ...
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1answer
16 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 ...
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3answers
85 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 ...
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1answer
54 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 ...
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1answer
16 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.
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2answers
50 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? ...
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0answers
25 views

Configure an Azure VM for Dynamic DNS for 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
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1answer
46 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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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 ...
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0answers
51 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 ...
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2answers
59 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 ...
1
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1answer
418 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 ...
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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 ...
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1answer
32 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
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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 ...
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1answer
40 views

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

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 ...
4
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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, ...
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2answers
28 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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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 ...
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1answer
13 views

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

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 ...
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1answer
30 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 ...
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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 ...
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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 ...
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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?
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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 ...
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0answers
8 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 ...
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2answers
24 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 ...
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0answers
50 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 ...
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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 ...
3
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2answers
47 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 ...
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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 ...
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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 ...
1
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1answer
46 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
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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 ...
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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 ...
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1answer
39 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 ...
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votes
2answers
31 views

AWS SES TXT Record Content

I need to get AWS SES setup for a domain. The registrar's DNS tool only allows me to put in a block of text for the TXT/SPF records (one block per record). I'm not sure how to format the TXT record as ...
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1answer
33 views

BIND DNS zone coalfired.net/IN: coalfired.net.coalfired.net/NS 'ns2.thirteen.pm.coalfired.net' has no address records (A or AAAA)

Since I updated my BIND DNS server I seem to be having problems with it. For some reason, when I try to start the server I get errors such as this appear: zone coalfired.net/IN: ...
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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 ...
6
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3answers
193 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 { ...
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1answer
58 views

Another domain points to my webserver

Somebody else has registered a name pointing to my webserver's IP address in .ma TLD. My domain foo.bar -> my ip address 1.2.3.4 Somebody defined: suspiciousdomain.ma -> my ip address 1.2.3.4 So ...
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1answer
40 views

Sender address rejected (mx record not found)

I am using both Exim and Office 365 to send email - the server sends automated mails from an application using Exim and Office 365 handles day to day user and incoming email etc. I am getting some ...
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2answers
46 views

What is the role of NS records at the apex of a DNS domain?

$ORIGIN example.com. ; not necessary, using this to self-document $TTL 3600 @ IN SOA ns1.example.com. admin.example.com. ( 1970010100 7200 1800 1209600 300) @ ...
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1answer
64 views

Can ping and browse IP, FQDN, and hostname but can't browse via SMB to hostname of server

Got a strange problem where on a server 2008 machine I am trying to browse to another server 2008's shares on a different site. I can ping the server's ip address fine, I can ping the servername ...
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10 views

How do I configure winbind to only register some interfaces with DDNS?

We are running an Active Directory. The hosts joined to the domain are a mix of Windows machines joined natively and Linux machines joined using winbind. All hosts have statically configured IP ...