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

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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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44 views

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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24 views

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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15 views

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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20 views

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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21 views

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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16 views

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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25 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: ...
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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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26 views

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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40 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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20 views

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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39 views

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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103 views

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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25 views

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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107 views

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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35 views

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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1answer
65 views

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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174 views

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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1answer
43 views

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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94 views

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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24 views

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 ...
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73 views

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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51 views

Error in named.conf

Hello 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 ...
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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 ...
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59 views

Resolving IPv4 address from DNS using the IPv6 address of a host (bind9)

I need to make a DNS query to one of my clients using IPv6 to resolve the IPv4 address for the machine, how would I go about doing that. I know i can just use the hostname to resolve both IPv4 & ...
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Split-horizon on DNSMasq?

Is it possible to perform Split-horizon with DNSMasq? I've googled and it seems like it is only possible with Bind9, any advice would be much appericated
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resolv.conf limited to six domains with a total of 256 characters

I've got a machine (Debian jessie) used to "jump" to another machines, with different domains.... actually many domains. As man resolv.conf tell us, search list for host-name lookup is limited up to ...
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IPTables - hex string block DNS query

I have a customer that is sending a lot of queries for a particular domain on my DNS server. I want block that queries and I found the hex string that is possible to be implemented. That is the ...
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Why does nss on Linux not fallback to unicast dns by default? [closed]

The default configuration for hosts in /etc/nsswitch.conf on Linux typically reads: hosts: files mdns4_minimal [NOTFOUND=return] dns myhostname This breaks on misconfigured networks that use ...
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1answer
65 views

Run SSH over a SOCKS proxy?

I need VPN-like behavior locally, without using a VPN. I've created a SOCKS proxy to a given server which is reachable from the WAN, and I want all of my traffic forwarded through that proxy so I ...
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Remove permanent redirect and clean DNS

I am experiencing "Server not found" errors since I did the following, in my server I had this domain structure: example.com -> permanent redirection to app.example.com app.example.com I removed ...
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iptables DNS guard protection

I' m going to implement some DNS security features on my DNS server and I was wondering if iptables can do the same job that cisco ASA/PIX does: DNS guard DNS Guard identifies an outbound DNS query ...
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1answer
119 views

Kerberos DNS issue with /etc/hosts

Thank you all for your time and attention. Very simply I'm getting this error when invoking kinit to test kerberos authentication against my AD domain (which is hosted on a Server 2012 box). The ...
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How to make resolvconf / dnscrypt / unbound work together on systemd - and respect openVPN routes?

I'm finding it tremendously confusing to appropriately setup Unbound.service on systemd. Use Case I am trying to get my Debian Jessie laptop to use DNScrypt as default DNS and Unbound as the local ...
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can ping google dns, but not google.de -> unknown host // worked in another network

I have a Laptop with debian jessie installed. At my home network, i could connect successfully to the internet (ping google.de successful). At the external network, i can't ping google.de (result: ...
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65 views

How do I set up my own dns record server?

I have the domain name example.com and I want to be able to configure my linux vps to handle what subdomain points to what IP. For an example I want to be able to set test1.example.com to point to ...
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37 views

resolvconf error in recovery mode with dhclient

when I go to recovery mode and I want to activate networking, I usually type: dhclient eth0 After this, I can for example ping to www.google.com. However, I get the following error: RTNETLINK ...
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143 views

Zookeeper DNS name problems with leader elections when migrating from Windows to Debian

I am migrating a kafka/zookeeper cluster on Windows to Debian wheezy. Java version: 1.7.0_80 Debian version: 7.9 Zookeeper version: 3.3.5+dfsg1-2 0 Kafka version: 2.10-0.8.2.1 If I configure ...
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69 views

How can I (re-)connect DNS for gmail on Linux Mint?

Let me refer responders to this thread on Linux Mint forums: Chrome/Firefox not loading Google websites I've seen this four times in the past two weeks or so. The loss of connection does ...