Newest 'domain-name-system' Questions

Q&A for system and network administrators

Transparent DNS proxy for IPv6

I`m looking for some "proxy", which would allow me to hide DNS server in my IPv6 network. I want to redirect incoming request to one vlan interface of border router to specific DNS server based on ...

Possibility to synthesise resource records in BIND?

is there possibility to synthesise resource records in BIND, similar as in KnotDNS with following command? synth_record "(forward`|reverse) <prefix> <ttl> \<address>/<nn>";` ...

Apache default site returning virtual host directory

I am new to the world of server administration and am trying to learn from the ground up. I am running an Apache2 server on Google Compute Engine and am configuring my domain with Google Domains. ...

Is it valid for a domain to have whois but no NS or A record?

I've been doing system administration for a couple of decades and my understanding has always been that: whois was allocated as part of domain registration (obviously not all TLDs have whois, but for ...

NOIP.com Domainname returns wrong IP via Google DNS [migrated]

at home I'm using the Noip.com service to set up a domain name for my ip address at home. For this you get a client which refreshes your IP-adress every 5 minutes. Now I'm using the google dns server ...

Proper Way to set Preferred DNS Server on the Windows Domain Controllers themselves?

This may be a basic question, but I'm not sure how to properly phrase what I'm looking for, with a google search. I have two Windows Server 2012 R2 domain controllers on the local network. Let's say ...

Debug DNS: What to do if host name resolution does not work as expected?

The current search results for "debug dns" don't reveal a guide-line what to do, if you (as user/client) think there is something wrong with the host name resolution. What steps can I do to narrow ...

Correct basic mail DNS records

I have some websites on AWS (Windows Server 2012 R2), and I'm trying setup a mail server. I have installed hMailServer, and in the guide say I need configure the DNS records for mail. I never needed ...

Mac based dns server?

Is it possible to return different IP for same domain based on the Mac(or any other thing) of the client? For example, I have a dynamic.test domain used in localnet, when userA queries the IP of ...

DNS - Use public domain name for internal use

I've setup Bind as my intranet DNS resolving service (running on Ubuntu 16.04.02 LTS). What I want to achieve: Having a public domain name which points to a server (example: domain.com -> 1.2.3.4) ...

Partial hyphenated wildcard sub domain dns records [duplicate]

What are the correct DNS records for {any}-the-sub.example.com? While avoiding CNAME *.example.com For extended subdomain {any}.the-sub.example.com that would be something like: the-sub.example.com ...

Cisco 2811 - disable DNS rewrite

We have two Cisco 2811 routers in HSRP configuration protecting a network with several vlans. We have a secondary public DNS for contoso.com zone hidden in there, as well as the mail server mail1....

How to enable local LAN DNS name resolution in Windows server 2008r2?

I'm running a Windows 2008r2 server in a non-Domain (workgroup) role. It is a DNS server and DHCP server for the LAN. DNS services work fine for external Internet addresses, but local hostnames do ...

Change ISP (with new IP Block) and DNS Servers without Downtime

We are transitioning from our current ISP to a new ISP and have a new block of IPs to utilize going forward. We host our own DNS servers internally and two of those new IPs will point to them upon ...

Ubuntu Server + Nginx Catch all domains with same DNS and display same php file in everyone

I have dozens of undeveloped domains and I want them to display the same .php file for all of them by just pointing them to the same DNS: ns1.example.com ns2.example.com Both NS are pointing to my ...

Windows DNS server recursive resolving issue with dns policy

I am using dns policy with windows dns server. In my scenario I want to allow recursive queries in local subnet (192.168.1.0/24) and deny for others. It works great until querying for a domain (...

NFS mount via Round robin DNS only mounts from single system when using 10 Gb/s ethernet

We have a round-robin DNS setup that map the same name ("gsx") to six different IP addresses. This is verified as working from the client by using things such as 'nslookup' and 'ping'. However when ...

Migrate AD DHCP

Soon, I will need to migrate my domain controller server with AD DHCP 2012 R2 from a PowerEdge R430 to a virtual machine on Windows server 2016 based on VMware vSphere 6. Can anybody post a step-by-...

What's the magic incantation to force DNS queries over TCP on an Amazon/AMI image?

It looks as though the resolv.conf option use-vc is being ignored on an Amazon AMI (latest 2016.09 version). Consider the following: [hadoop@ip-172-20-40-202 ~]$ cat /etc/resolv.conf search default....

How to select a host to serve an application based on the third-level domain name?

The question may be pretty simple, and the obvious answer is even more straightforward (it's impossible), but perhaps I am missing something. I have several physical servers that host custom ...

Do DNS queries always travel over UDP?

I've spent a bit of time researching this topic and can't seem to find an exact answer, so I'm fairly confident it's not a duplicate, and while my question is based on a security need, I think it's ...

How can I use my website's domain name to access the web server on my home network? [on hold]

I have a web server on my home network hosting my web site. I have configured my domain's nameservers to resolve the domain to the external IP address of my router and have configured port forwarding ...

Use DNS or similar to re-route URL shortener service when dedicated server is down [closed]

I am trying to make a link shortener resilient to server failure by re-routing to a good server. Example: shortener.com/a1b2c3 > forwards to > website1.com (shortener.com and website1.com are on ...

Migrate Windows Server 2008 configuration to Windows Server 2008

I've already taken a look at these questions: Migrate Windows Server 2008 to another server Migrate Windows Server 2008 to a new hard disk Migrate Windows Server 2008 to a new hard disk 2 But I don'...

Custom domain name and share it LAN

I recently developed a websites and want to host the websites in windows 7 locally through IIS server by giving a custom name of localhost to www.ilfsl_updated.com and wants to share this websites ...

DNS Resolution fails on multihomed server

I have an odd issue with a freshly installed Win2012R2 server (Actually a VM running on VMWare). The server has 2 nics (Both enabled), one on VLAN101 the other on vlan102. The configuration: Nic0 IP ...

Server DNS Resolve issue

So I'm currently using VMware Pro 12 for the purpose of a lab environment. The problem I have now is that on my domain controller I can't ping my client, although the client is configured properly. ...

MaraDNS fatal error

I'm trying to run MaraDNS 2.0.13 on Windows 7 as an authoritative DNS over LAN. I am getting the following error when running maradns.exe with the command maradns -f mararc: Fatal error: No ...

Why dig NS returns nothing for a domain while it can find an A record for that domain?

I'm confused by the DNS resolution. How is it possible that for a domain we can get an IP (A record) but no authoritative NS is returned for that domain. For example dig ns HDRedirect-LB3-890977680....

How to Add Pointer Record in Reverse Lookup DNS Zone (Windows Server)

I want to add a pointer record in reverse lookup zone in windows 2012 Server. The pointer record should point to a delegated zone defined in a forward lookup zone. I want to answer any DNS query: b....

Is `gcloud dns record-sets import --delete-all-existing` transactional?

When updating the contents of a zone using: gcloud dns record-sets import RECORDS_FILE --zone=ZONE --delete-all-existing --zone-file-format Is this operation atomic? i.e. if I have a record in ...

Apache/PHP unable to resolve hostname

This morning for the second day in a row, PHP on my server was unable to resolve the hostname to a IP via file_get_contents('http://newswebsite.com/feed.rss'), and service restart apache2 resolved the ...

Hyper-V Virtual Machine - DNS resolve Slow?

I am running a Hyper-V server (Windows server 2012) (dedicated machine) for multiple subsystems that are virtual-machines. (3x Windows, 1x Linux) In general all works well except one small issue. ...

Name resolution and DNS registration for a CentOS 7 Azure VM

I have a Linux VM (CentOS 7.2) running on Azure, which is configured as a DHCP client because this is required by the Azure platform; Azure DHCP correctly supplies a network configuration to the VM, ...

Samba AD: Bind can not load the Zone File because of “Empty Label”

I am currently running Samba 4.5.4 as AC DC with Bind 9.11 as DNS Backend on Arch Linux. Now my Problem is: Bind won't start because of the following Error: dns_rdata_fromtext: buffer-0x74b85f34:1: ...

Adding DKIM DNS record - can something go wrong?

I have a working external managed mail system for our company domain. Additionally I am currently trying to setup a second mailserver (which I have control over) for the same domain with DKIM with ...

2 networks, but name resolution fully works only for one network

I have a Windows 2012 Server with DNS configured, on vmware workstation. Name Server is "ad.nuglab.local", with "Host (A)" record of 172.16.202.109 and 192.168.1.111 On my host PC, with dns server ...

What is the reason behind email service-only domains? [closed]

This is a bit of a short question - but what is the reason behind websites giving their email system (like when you receive an email notification from Facebook, it comes from facebookmail.com). Is ...

Why does authoritative MaraDNS query time out?

Attempting to host authoritative DNS over LAN I'm using MaraDNS on WIndows 7 to resolve a locally hosted domain name over LAN only. The site is hosted at 192.168.XXX.XXX/wordpress using the domain ...

How to get Cloudflare and Name.com to work together

I registered mysite.com on Name.com. I'm trying to use CloudFlare for CDN and DDOS protection. On Name.com, under nameservers section, I used: val.ns.cloudflare.com west.ns.cloudflare.com And on ...

Use nginx to route HTTP traffic on port 80 across app servers on the same machine [on hold]

I have an EC2 instance on AWS that I want to host several small projects. Each project runs on its own app server (one is Play Framework, another is Sails.js, etc). Each app server requires its own ...

DHCP Server Listing Host as “BAD_ADDRESS” and not Registering DNS

Question Why is DHCP showing "BAD_ADDR", why does it think there is a Conflict, and why can't the host register its DNS name? Devices: DHCP Server = Server 2012 on bare metal. Also running DNS. ...

Accessing website via IP is faster than domain name?

I am currently receiving a lot of traffic (1+ million page views a day). I have four 16GB RAM 8 CPU nginx servers setup behind Digital Ocean's load balancer (it is a new feature that they have added). ...

iptables rules for allowing specific DNS requests from external to internal network

I have a network split into 4 parts: an external DMZ, an internal DMZ, a userspace and a cluster. I also have 4 firewalls: a boundary router between the Internet and the external DMZ, a cluster front-...

Does anycast allow for alternate routes to be attempted?

A bit of a bodged up title but I don't know enough of the subject to come up with a more suitable one. I've read time and time again that anycast is a great solution for load balancing and is the ...

How to block local ns records to the public?

I have a DNS and active directory server behind NAT (I have to). On DNS server AD automatically adds a NS record for private ip address. How can I set a policy to response local NS record for a ...

Where can I find my own server's DNS records? Need to update it for a third party mail delivery system - SparkPost?

I have a forum running which occasionally sends out emails to registered users. We are switching our forum engine from vBulletin to Discourse. While configuring Discourse, I need to provide the ...

Is 127.0.0.1 a routable IP address

Hi I have a app that I am working on. I have the DNS entry me.myappdomain.com that has dns entry points to 127.0.0.1 When my app starts up, it talks locally to a server I have on each device. I ...

Migrating site using A record and avoiding naming conflict

A client has their new website hosted on our server, the new site however is under a different name to their domain name, as we hold developed sites on a subdomain. They want to load the new website ...

PHP throwing server errors after Ubuntu ran an unattended-upgrades session - any way to determine the cause?

We just had an incident on one of our webservers. Several PHP applications run on it and started spitting out the following error message: php_network_getaddresses: getaddrinfo failed: Name or ...
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