Domain Name System (DNS) is a service that provides the resolution of host names to IP addresses. Use the [tag:dns] tag when you are troubleshooting DNS issues, configuring a DNS resolver or server, or are trying to understand DNS's involvement in your situation.

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Configuring Dynamic DNS on CentOS 7 without dhcpd service

I have a CentOS server on which I configured DNS but it doesn't serve as a DHCP sever, since I have a d-link router which serves as such (DHCP is enabled on it). Is there a way I can configure Dynamic ...
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Ethernet Connected But No Internet

I am trying this on Intel Galileo Gen 2 which runs Yocto Linux and I am unable to connect to Internet using Ethernet. I have WiFi card but that doesn't connect as well. I have tried following commands ...
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DNS server for blacklisting tons of domains and also some TLDs

I'm trying to setup a basic DNS server for my lan that is able to put in a nullroute or 127.0.0.1 lots of domains. The domains I want to block come from a list but I also want to block some domains ...
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Domain forwarding/masking

We have to redirect/forward all HTTP(S) requests from one web server A to a web server B (which will show the downtime info) only if the server A is not accessible. Can we use DNS forwarding for this ...
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use ufw to block all incoming/outgoing domain requests except my chosen one

I'm trying to allow port 53/udp to query ONLY to google's 8.8.8.8 and listen from it. I don't want my PC to accept offers from any other DNS. I'm testing this theory by connecting my PC DIRECTLY to ...
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Openvpn clients discovery through dns

I have got an openvpn server in germany and various Linux centos clients connecting to him. The first and difficult thing that I'm noticing, is the impossibility to have got resolv.conf updated by ...
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Parrot DNS configuration? Debian

I'm running Parrot 2.2. kernel linux 4.3.3-parrot-amd64 MATE 1.8.1 Cable plugged in and appears to be connected. I pinged google.com and term said ping: unknown host google.com My buddy told me to ...
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How to find out the service name, that is required for a SRV record?

Im pretty new to Linux so here is my question: Is there any command or any other way (exept googling) to find out the service name that is required for a SRV record (port forwarding? I am using a ...
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No internet on Linux Mint 17

I have been using Mint 17 for the past 2 months now and it didn't show any problem in networking. Recently, however, when I connect to WiFi it works fine for a while, but when I leave the system idle ...
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Forward ALL incoming HTTP requests to one of two servers based on subdomain?

I have two Debian Jessie servers. One is my home server that I use for personal/hobby stuff, the other is my development server for work. For arguments sake lets say... Personal: 1.1.1.1 ...
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Does a wifi router have to handle DHCP for its clients?

I'd like to manage the IP addresses within my network a little better than my router currently allows. But I have (what is potentially a stupid) question. Before I embark on a journey of learning and ...
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How to avoid curl trying IPv6 name resolution

From a docker container when I try to curl 'another container name', curl first tries to resolve the name to IPv6. This causes few seconds delay because the web server is not reachable over ipv6. I ...
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Why is my ISP DNS still in resolv.conf after a VPN connection and how can this be fixed?

Ubuntu 15.10 and dns=dnsmasq is commented out in /etc/NetworkManager/NetworkManager.conf Before I connect to a VPN /etc/resolv.conf contains nameserver 2xx.xx.xx.xx <-- ISP DNS 1 nameserver 2xx....
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Cannot connect via ssh to server with global IP address

I have the no-ip service running on my raspberry pi, it updates the DNS (no-ip) whenever there is a change to it's IP address. I have enabled port forwarding on my router (Asus rt-n66u) ports 22 &...
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How to set properly a DNS for a specific IP?

After reading tutorials on the internet, I don't succeded to set a domain name to an IP adress in debian. here is my /etc/resolv.conf: domain localdomain search localdomain nameserver 172.16.170.2 ...
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`getaddrinfo`: what specifies its data source in the POSIX standard?

I wanted to check getaddrinfo is expected to use Unbound when it's installed. Unless I overlooked something in this specification, it does not refer to any data sources it is required to check: ex. no ...
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Debian: Order of DNS servers when using VPN

My notebook gets its DNS servers via DHCP. When I start a VPN session (pptp, managed my networkmanager), the DNS servers received from that VPN session are queried first. I'd like to use the DNS ...
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ssh_config: Add a host section that matches IPs even when connecting via hostname

I want a host section in my ssh config that matches any local IP: Host 10.* 192.168.*.* 172.31.* 172.30.* 172.2?.* 172.1?.* setting setting ... This works as long as I connect directly to a ...
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OpenBSD cannot find host names

I have a openBSD instance under vultr. I installed OpenBSD 5.8 and I can ssh into it just fine. But I cant seem to be able to use pkg_add, ftp, ping or any other internet dependent program. For ...
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Does 'reloading' a server reset dns/email settings

I have a client with web hosting on a Linux VPS. Unfortunately, I know very little about VPS hosting and am having a hard time finding information on how to set up email and DNS records. So the best ...
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How to configure BIND for domain name with own nameservers?

I am using BIND 9.10.3_P2 to setup DNS records for domain speedydrive.net. The domain itself has glue records on parent servers with 2 IP addresses for NS servers. Everything looks fine except the ...
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MX Record Question

Is there a way to bypass the DNS's MX record? My company uses Barracuda for spam filtering and our company's MX record points to Barracuda. A product we're trying to build needs to talk TLS to the ...
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getting dnsmasq to issue different ip address for domain name when dhcp client connected

I am undertaking development of an https application (both client and server) which requires that I issue myself a certificate with the domain name of the server. Lets say its test.example.com and I ...
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Bind dns zone will not work

THe issue i am having is that i am trying to create a email server but my emails are rejected due to invalid ptr record. $TTL 600 @ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( ...
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Different A records for a domain

I have a domain which A record points to a site, hosted on VPS. Now I want to make a mail server, which is located on a second VPS. To make mail server work I need MX records, which is based on A ...
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146 views

PowerDNS returning ServFail for all requests

I have been working to get PowerDNS running on CentOS 7 x64 that is up to date. Followed this guide for everything except Nginx because I am using Apache: https://www.rosehosting.com/blog/install-...
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Removing Incorrect WINS record

So I have a Ubuntu 14.04 server that I'm trying to get to run as a Domain Controller for a set of Windows machines. I've set up a Bind9 DNS and it works fine, pinging the nameserver gives the correct ...
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How to find the domain name of a server?

I'm having trouble finding the domain name of my school's server, I read another question similar to this but their commands didn't work. I tried to use nslookup and then when I was prompted I ...
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Please explain to me named.stats file

I don't quite understand BIND9's statistics file named.stats. Couple of things: 1.) +++ Statistics Dump +++ (1453303803) - what does it mean? Is it when the file was created? And One and half billion ...
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256 views

OpenVPN server on Kubernetes cluster / DNS and Service resolution

I have a Kubernetes cluster running applications (currently on a set of Vagrant CoreOS VMs on a local server) I want to be able to debug a particular application locally on my laptop, so I worked on ...
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How to return the nearest DNS IP based upon requesting client's IP?

To achieve a faster internet experience, one aspect that can be optimized is to ensure a client is making use of a nearby DNS, rather than something on the opposite side of the world that might ...
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Choosing right resolver for certain domain

I'ts possible to let resolver to select a specific resolv for particular domain? For example i have, in my resolv: search www.huaweimobilewifi.com mycompany.domain nameserver 192.168.8.1 <- my ...
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Get the external IP address in shell without dig in 2016?

This question: "How can I get my external IP address in bash?" Solves the question with a call to dig: dig +short myip.opendns.com @resolver1.opendns.com; that is the fastest resolution possible, ...
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Large zone file for bind9 : ad-blocking

I was successfully using a small (20,000 entries) zone file with bind9 server, but today my data provider sent an update which caused the zone file to become 300,000+ entries large (30Mb+). The ...
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DNS problem with ipv6 on centos6

I have a couple of open-stack instances that communicates with github.com. When any of these machines reboots , the file /etc/resolv.conf gets the ipv6 addresses of my DNS servers. Everything still ...
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VPS not resolving DNS names

I have a CentOS 6 VPS. I can ping 8.8.8.8 but not google.com. My resolv.conf is: nameserver 8.8.4.4 nameserver 8.8.8.8 nameserver 4.2.2.4 Is there anything else that I should check? Update: # ...
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Kali Dns Problems

I have a problem. So, when I connect to any wi-fi station I can't use google or yandex. I solved that. The thing was in dns. I added google dns servers to 'resolv.conf' and it worked fine. However, ...
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How can I programmatically modify DNS lookups in real time?

I want to use OpenDNS (parental control) and UnoTelly (geo-restriction circumvention) together. OpenDNS returns an IP to an error page if the site is blocked. So if I get that error IP, then I want ...
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How to set static DNS with dhclient while resolv.conf keeps getting overwritten?

Following the Debian NetworkConfiguration wiki, I've been trying to setup static OpenNIC DNS with no success. The first thing I tried was directly editing /etc/resolv.conf, but it keeps getting ...
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server can't find xxx.xx.xxx.192.in-addr.arpa:NXDOMAIN

$ORIGIN xx.xxx.192.in-addr.arpa. $TTL 86400 @ IN SOA dns1.testserver.com. hostmaster.testserver.com. ( 2001062501 ;serial 21600 ;refresh after 6 hour 3600 ;retry after 1 hour 604800 ;expire ...
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Need for IPTables expert, possibly with knowledge of u32 module

A customer is sending queries against DNS root-servers on my recursive DNS server. I need to block it with iptables. I tried 3 examples but it is not working. 0 0 DROP udp -- * * ...
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Raspberry pi wireless TOR access point. Open VPN doesn't connect. DNS problem

I have Raspberry pi (Raspbian) wireless TOR access point connected via ethernet cable to my local router. Everything works fine except one thing. When I want to use VPN, I'm unable to connect to my ...
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DNS temporarily fails with VPN addresses

I'm connecting to a company network on Lubuntu 15.10 with vpnc either on terminal or via the network manager. Sometimes I can reach the intranet hosts fine, then suddenly they are gone. Then they come ...
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What is the best way to keep a Linux server's hostname consistent?

We have a server with a CentOS distribution of Linux. It lost its hostname in the month somehow, since our last reboot. We ran an ETL (extract, transform, load) job last week, and part of that ...
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Is this the correct SPF DNS TXT syntax to allow the existing email servers (DNS MX records) and to authorize the new smtp server ip-address?

v=spf1 +mx ip4:65.1.2.3 -all Domain DNS TXT records to change: product1.com : sales@product1.com otherproduct.biz : sales@otherproduct.biz Information: Both domains have DNS MX records, and ...
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DNS Zone A record for domain [closed]

Is there any contradiction of having A record for a zone name? I know very experienced administrator who didn't want to add A record for zone names, and I don't know why. If the zone name is example....
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Thunderbird can't resolve DNS host names on Linux Mint 17.2

I just upgraded from Linux Mint 14 to 17.2 and Thunderbird 38.4.0 is having problems. It can't resolve any host names except those in /etc/hosts. Everything else I've tried, including Firefox, the ...
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Error in named.conf

I am getting the following error: Starting named: Error in named configuration: zone blk1999.lab/IN: loaded serial 2001062501 zone localhost.localdomain/IN: loading from master file named.localhost ...
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Will LINUX OS caching override Weblogic JVM caching setup?

We made networkaddress.cache.ttl=2 at java.security file to cache for only 2sec.But in reality Weblogic is caching forever. Now we can see :- grep hosts /etc/nscd.conf Currently supported cache names ...
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centmin mod setup Domain Nameserver

I install centmin mod on my VPS. (ex. IP VPS 49.49.49.49) then i select option (2) to Add Nginx vhost domain then i create 2 vhost mydomain1.com and mydomain2.com. add my domain panel, there's 3 ...