Domain Name System (DNS) is a service that provides the resolution of host names to IP addresses.

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ssh connects to wrong server

I changed the ip address of an ubuntu server in DNS before 10.x.x.111 after 10.x.x.222 I've flushed the dns cache, and yet when I try and ssh into the machine, ssh still tries to connect to ...
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17 views

user- or group based DNS resolution settings

Can I change DNS resolution settings on a per-group or per-user basis on Linux 3.x? I would like different groups to use different DNS servers and (if possible) different static entries (like those ...
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26 views

Redhat 7 DNS Bind Failed to restart

I am getting Error while Restarting the Named.service in Red-hat 7 Here is my Lab Status and all the Command. Configure DNS in REDHAT 7 DNS Name p1.linux.com IP address 192.168.1.1/24 N/W ID ...
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27 views

How to set and get DNS and DHCP servers addresses

On my openSUSE 13.2, I have a case to set and get DNS and server addresses. I managed to get the DNS address by parsing /etc/resolv.conf, my concern now is setting DNS and DHCP. Does changing the ...
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107 views

Ubuntu server 14.04 cannot reach dns but can ping

The server A has access to the Internet, since I get correct response when I use curl . And I have another server B which is free of this issue, of which /etc/network/interfaces and /etc/resolv.conf ...
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how to troubleshoot domain name before re-pointing Nameservers

suppose I have a site: awesomefootball.com hosted on a Linux server with db etc.. For testing, I know how to pull a copy to my MacBook and set up /etc/hosts file to let me test at ...
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41 views

dnsmasq causes inability to resolve DNS queries made by host

On a headless Ubuntu 14.04 vanilla machine I setup dnsmasq as a DNS proxy with the following configuration in /etc/dnsmasq.conf no-resolv nameserver=<some working custom dns ip> port=5555 #to ...
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36 views

Why must a server know its own host-name and domain-name?

In Linux, a server can set its own host-name and domain-name through sethostname() and setdomainname(). I just wonder, however, why must a server know its own host-name and domain-name? To my ...
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DNS resolution problem with OpenBSD

During boot up, messages flashed on my computer screen, among which are the following: DHCPACK from 192.168.200.1 bound to 192.168.200.12----> renewal in 432600 seconds The contents of my ...
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43 views

After changing network openvpn keeps querying stale dns

After changing network connection in my laptop (fedora 21) openvpn clinet is unable to resolve server address so every several seconds same line appears in logs: RESOLVE: Cannot resolve host address: ...
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25 views

How to Setup dns in Virtual machine

I want to know how dns resolve the name. DHCP server installed in one vm. How to setup dns in the virtual machine and what are the configurations I need to do. And when i start another vm, it needs ...
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63 views

How to search .local?

I just set up my new Pi2 with Raspbian. All works well, I installed avahi, so that I can reach the Pi via raspberrypi.local. However, the Pi does not find my MacBook, which is usually resolvable via ...
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68 views

Avahi commands not working in CentOS

I want to use Avahi tools for mDNS service discovery in CentOS 6.6. I have installed the following packages: avahi, avahi-tools, nss-mdns. I checked the Avahi daemon and it is running: $ service ...
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11 views

PHP framwework, multiple sites and httpd and DNS

I'm wondering if this is possible: There is a PHP framework and someone made several sites, which can be accessible like this: .../index.php/aaa .../index.php/ccc I would like to somehow map DNS to ...
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10 views

BIND cannot map one name

I setup a BIND sever. Let domain be example.com, httpd running. There is a separate zone for aliases to another domain, different.com I setup zone file for different.com to be: am IN CNAME ...
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46 views

How can I have hosts register their IPv6 addresses in Windows DNS

Windows clients support registering their IPv4 and IPv6 addresses in DNS after obtaining the address from a DHCP server or via IPv6 Router Advertisements. For my CentOS 7 and Fedora 21 boxes I'd like ...
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48 views

connman connections extremely flaky and slow

I'm trying to configure my system to be able to connect via either ethernet or wifi with connman. I was able to hotplug my ethernet with systemctl restart dhcpcd.service previously, but I'd like to ...
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30 views

iptables, differentiate ports based on hostname

Is there a way, using iptables, to ACCEPT traffic from HOSTNAME1, HOSTNAME2, HOSTNAME3 to port 22 and FORWARD traffic from everyone else to a different port and make the rule persistent? ...
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54 views

Resolving IP address to get Domain Name

How to make my server be resolved by IP address and get the domain name. For example: then Anyone can use: resolveip <my-ip> And get the output of my domain name; like www.xyz.com.
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91 views

How can I make my primary DNS take priority over other servers?

Note - I believe my title is the way it's meant to be... I used dnsmasq on my server and it sets DNS (via DHCP) to clients as: 192.168.2.1 (local server) ISP DNS 1 ISP DNS 2 This at least works - ...
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72 views

Exim4 DNS issues

I'm trying to forward the emails from my Debian server to my usual email address. I'm probably missing something important, as I can't find a good solution online looking for the following error ...
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67 views

DNS suddenly stops working for a particular network on a particular machine, DNS_PROBE_FINISHED_BAD_CONFIG

I'm staying somewhere for a while where there are two wifi networks. One's mediocre, one sucks. The mediocre one worked fine on my HP machine with a Realtek card running Mint for several days. ...
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38 views

Can I Mix Multiple Nameserver Sources in resolv.conf

In the list of nameservers in resolv.conf, can I use different nameservers (one from ISP, one from Google, etc..) in each line or does it all have to be from same source? Example: nameserver ...
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35 views

set network manager dns in ubuntu

I have Ubuntu 14.10. When I'm at work I can browse the internet without problems. Now that I'm at home, I can connect, but I'm not able to browse the web. Some informations: the output of ifconfig: ...
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27 views

Why won't my BIND / Apache configuration work?

I am trying to set up a BIND configuration with an Apache webserver. What I am trying to achieve is to by using the URL www.exampler.net access the content that can be found on my Apache webserver's ...
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42 views

Adding a Wildcard to PowerDNS

Ok, first, full disclosure: I'm a total noob at this and could be going about it all wrong. I'm trying to use a server on my network (in this test case a Raspberry Pi running Raspbian) as the DNS ...
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dns dsc auto refresh

I installed the DNS traffic monitoring tool DSC in the centos6.4, but the DSC Apache page is static, how to set up to automatically refresh? For example, each minute refresh time
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124 views

resolvconf writing invalid resolv.conf file

Every time I connect to my VPN I lose DNS with an error of, "cannot parse /etc/resolv.conf" The offending line is line 1 being an empty "domain". So after connecting to the VPN my resolv.conf file ...
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105 views

BIND/DNSMASQ query hanging on ubuntu server 14.04.1

I'm testing out a BIND and DNSMASQ configuration on my VPS. When I run a program which submits a bunch of queries (around 10-20 per second) my DNS replies stop coming back for a random amount of time. ...
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69 views

How do devices add DNS entries on a local network?

I have a D-Link WiFi extender DAP-1320, and somehow, when it gets plugged in, it enables my Linux box to resolve dlinkap.local to its IP address. I don't have to add anything to /etc/hosts. In the ...
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124 views

Running HMA Pro VPN on Kali Linux

I've installed HMA VPN on my Kali Linux distro but I'm having problems connecting to a VPN IP address. I run the command ./hma-vpn.sh -l "Amsterdam" for example, and then I try to connect to a ...
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apache won't restart after adding VirtualHost conf file, why not?

In a CentOS 7 server, I get the following error when I type sudo apachectl restart after I add an include file at the bottom of httpd.conf: Job for httpd.service failed. See 'systemctl status ...
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Cannot Intentionally break/stop DNS via /etc/resolv.conf - Always resolving no matter NS config

I am still learning linux, and so far having great trouble in the networking and DNS areas - I think due to misunderstandings. My understanding is if we provide nameservers in /etc/resolv.conf these ...
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102 views

DNS/BIND configuration to resolve *.mail.*.outlook.com subdomains

I'm running BIND 9.3.3rc2 on a CentOS 5 system acting as an SMTP server. Until last week, I haven't had any problems with DNS or name resolution. The only problems I have resolving are with subdomains ...
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55 views

Explain this dig command

Please explain what this command will do and whether it can be undone: dig +nocmd strongimages.tld mx +noall +answer
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How to understand TTL values in dig command output?

I am reading about how DNS works in general. From the wiki entry of TTL, I understand TTL (Time to Live) occur in the Domain Name System (DNS), where they are set by an authoritative name server for a ...
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91 views

PowerDNS not resolving host computer

I just finished setting up PowerDNS to avoid having to remember all my IP addresses and it seems to work pretty fine, most host names resolve just fine but not the one running PowerDNS (named ...
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DNS Issues On ISPconfig3

I use ISPconfig3 to host a couple of test sites. I recently had to change my public IP address, so I made changes to ISPconfig per recommendations from the community. However, I have not been able to ...
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openwrt: dns resolving error from wifi connected devices

I am not sure what have I messed up, but I cannot resolve other pc's in my local network from the wifi-connected devices (laptops and cell phones). I have a separate tower-pc that acts as a dns and ...
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95 views

OpenConnect not resolving hostnames

I'm running LMDE 17, and I've installed OpenConnect v6 and the repository version of network-manager-openconnect. Everything is peachy, except any address for the domain companyname.local doesn't ...
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180 views

How to make resolvconf append nameservers to the list instead of prepending them?

I'm trying to configure OpenVPN to update DNS-servers as described here. That seems to work, but resolvconf prepends nameservers (and also search domains) to the list of existing nameservers. How can ...
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1answer
243 views

Reverse DNS does not match SMTP Banner for multidomain hosting

We are planing for mail hosting, we are going to host multiple customer mail domain on single public IP. Now how i am going to set PTR record per customer? because i have single IP and it has to be ...
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54 views

DNS: Can I list 1 host in 2 separate domains?

I want to test something, but I lack sufficient number of machines so I was going to overlay a subnetwork listing the same hosts under different names. I can't think of any problem with this, but I ...
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1answer
105 views

Why are NS records needed in zone-files?

I installed BIND and I am aware that it is required to have at least two NS(Name Server) records in zone-file. This is true also for reverse-zone files. I understand that NS records point to ...
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820 views

wget is unable to resolve host address 80% of the time

I have a wget 'http://xxxx.net/somepage.asp?params@abc' in a bash file. When I run it, four out of five times it says: Resolving xxxx.net (xxxx.net)... failed: No address associated with hostname. ...
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How can I go about tracking down DNS queries?

I was looking at the dnsmasq logs on a router I run and noticed that there are requests to a particular url on a regular basis. This was happening while the only client connected to the network was my ...
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39 views

Resolving DNS through HTTP/HTTPS

Is there a way to resolve DNS through HTTP/HTTPS, the case was: my ISP redirecting every DNS request to their own DNS and poisoning the DNS records. all I need is a software that could resolve ...
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centos virtual machine not registering with intranet dns server

When I am creating a Ubuntu virtual machine on virtual box it automatically registered with DNS server in my intranet network, it has both intranet IP and domain name. When creating CentOS virtual ...
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60 views

Configuring Named DNS zones (Centos7), specifically CNAME

having trouble with some DNS configuration, I have managed to get part of the site working, however adding the prefix 'www', I'm finding a little tricky. Essentially, what I want is mysite.net -> ...
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83 views

Look up ip addresses of multiple hosts with same name

Is there any way to look up the ip addresses of all hosts with the same host name? The reason I want to do this is that at work I prefer to use an ethernet connection with my laptop whenever possible ...