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

learn more… | top users | synonyms

5
votes
2answers
61 views

DNS lookups sometimes take 5 seconds

I have a VM running Debian Wheezy on which some hostname lookups take several seconds to complete, even though the resolver replies immediately. Strangely, lookups with getaddrinfo() are affected, ...
1
vote
1answer
45 views

DDNS (dynamic-dns) setup and adding a hostname to a device (to be visible on the network)

How do I provide a fixed Hostname to my device so that a netscan can shows up the device name across all platforms? How can I reach the device using the hostname/MAC-ID (something which is fixed) ...
-1
votes
2answers
54 views

My Centos Server cannot resolve the DNS host name [closed]

My Server OS: Centos 6.3 x64. The server iptables is: *filter :INPUT DROP [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m tcp --dport ...
4
votes
2answers
63 views

Port Routing/DNS for individual program

Background Flickr has closed its http api leaving an https only api. My favourite uploader (the official Flickr Uploadr version 2.5 running under wine) is no longer maintained, so this change broke ...
0
votes
1answer
25 views

bypass firewall with Openvpn + Squid

I have 2 VPS servers, one in China and another in the US. The server (openvpn client) in China is connected to the US one via openvpn. I also have squid running in the China server. I want to ...
9
votes
1answer
107 views

Can a domain be configured to only have secondary DNS nameserver records?

I'm asking if someone can verify if my DNS hosting idea is possible or has any flaws. We would host our own primary DNS server for all zones and configure it to allow zone transfers to a set of IPs ...
2
votes
1answer
17 views

What does the Bind bindkeys-file directive do?

Just trying to understand the bindkeys-file directive related to the DNSSEC extension in the Bind configuration. Is that a public key? Does it sign the response in the same way as digital signatures?
3
votes
1answer
47 views

DNS resolution problem with Fedora 20

I have a newly built Fedora 20 server that I've just hooked to my network. It's a virtual server running on a VirtualBox host. Everything seems to be working but I have a problem with name resolution. ...
1
vote
2answers
29 views

dns resolve for 2 IPs with same reference

We having following situations: On a server, we have to set 2 IPs which will be refereed to the same fqdn. in the application which is running on the server, we are configuring the FQDN. Once there is ...
0
votes
0answers
34 views

DNS server design

Currently my company is deploying SIP phones in different locations from different boroughs. I've been asked to create static DNS records for each of the phones with the following format: ...
0
votes
0answers
16 views

How can I make CentOS 6 treating WiFi flexibly like Ubuntu 12.04?

In my office, I have AT&T Uverse. The router is a 2wire 3600HGV. The WiFI is provided by a Cisco Linksys E1000 that is plugged in the 2wire device. With my notebook running Ubuntu 12.04 LTS ...
1
vote
1answer
68 views

Getting DNS queries to 73.207.210.75.in-addr.arpa

My Linux system is doing a lot of DNS queries to 73.207.210.75.in-addr.arpa but I don't know of any reason it should be doing this. What is at in-addr.arpa? Any reason why these queries are ...
3
votes
1answer
78 views

How to test /etc/hosts

What's the best way to confirm that your /etc/hosts file is mapping a hostname to the correct IP address? Using a tool like dig queries an external DNS directly, bypassing the hosts file.
0
votes
1answer
48 views

how to avoid NSCD for DNS

I am using NSCD service for DNS now. But sometimes I see NSCD dying itself and DNS resolving doesn't happen properly. please tell me how can we avoid NSCD for DNS . if we bypass the NSCD what is the ...
0
votes
2answers
120 views

how can I add records to the zone file without restarting the named service?

I'm working on centos6.5 and bind9 and I have managed to add records to a DNS zone by doing this steps: creating the key: dnssec-keygen -a HMAC-MD5 -b 128 -n HOST example.com. editing conf. ...
0
votes
0answers
17 views

Free DNS Clients [duplicate]

I have a Synology server 213. I host my own sites and every month I have to update my dns. I use freedns. I have noticed that you can get scripts that check your ip and hopefully update it when it ...
0
votes
1answer
77 views

UFW is blocking DNS

I am configuring the security in my server. For easier the manage at the firewall, I installed the UFW. I did some settings in the UFW and I allowed some ports. Therefor when I enabled it the DNS ...
2
votes
2answers
159 views

How can I block a subdomain with dnsmasq?

I use dnsmasq as a whitelist on my network. My dnsmasq.conf file looks like this: bogus-priv domain-needed no-resolv server=/stackexchange.com/8.8.8.8 #etc... I would like to be able to block a ...
0
votes
1answer
82 views

Cannot resolve hostname

I'm using a Debian on a RaspberryPi and the problem that I'm having is that I can't connect to the Internet. Every time I try I see a message that says "cannot resolve hostname". From the terminal, I ...
1
vote
2answers
45 views

How to I fetch the very latest DNS records from a recently updated domain?

I recently updated my domain and added CNAME and TXT records, and don't want to wait for the changes to propogate. How can I go directly to the source and query the DNS records to verify everything is ...
0
votes
1answer
94 views

How can I use CNAME in Bind properly?

I'm new to Bind/DNS and want to point/map SMTP, webmail and IMAP to my domain but a check in nslookup is failing. How can I nslookup SMTP this way? The error I get is: smtp.stylez24.com: NXDOMAIN ...
1
vote
0answers
44 views

rndc addzone failed: not found

I installed bin 9.8.4 (default) on Debian Wheezy. after configuration I tried to add a slave zone with the following command: rndc addzone test.zone '{ type slave; file "test.zone"; masters { ...
0
votes
0answers
24 views

Debian DNS on multiple networks

I have a Debian 7 box with two nics, each nic is on its own separate internal network. I have windows dns servers on both networks. I would like the Linux box to be able to resolve local machine ...
1
vote
2answers
67 views

How to change the name of localhost to a custom name which is available to other users in LAN

I need to use the a custom URL name which is accessible from all devices in a LAN. I know that it can be set in the /etc/hosts file 127.0.0.1 myname 127.0.1.1 system09-System-Product-Name # The ...
-1
votes
1answer
44 views

Why DNS server changes when enabling another interface on machine

My system has 6 interfaces, a loopback, a Xen Bridge, and then 4 ethernet interfaces eth0-3. In this system, my DNS server assigned by DHCP on xenbr0 is 192.168.1.1. Initially eth1 is disabled and ...
5
votes
1answer
142 views

delay to get password prompt when ssh'ing to a public server

i have a server (debian 7) setup in my university with public ip. when I ssh into the system (from outside the campus), I get a weird delay of 5-10 seconds before I get the password prompt. Why is ...
4
votes
2answers
248 views

How does DNS name resolution work, in principle?

Right now I'm taking an online course for Linux sysadmin and I was asked a question I just generally don't understand. I know how to search for a name server, if I'm correct at least it's using the ...
9
votes
2answers
7k views

How do I set my DNS on Ubuntu 14.04?

Most of the info I see online says to edit /etc/resolv.conf, but any changes I make just get overridden. $ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by ...
1
vote
1answer
98 views

No domain defined in /etc/resolv.conf

I see more and more servers that have no domain defined in the /etc/resolv.conf file. Only a search entry. In what cases is this setup used ? Are there any cases where it must not be used ? ...
3
votes
1answer
82 views

Blocking Websites with /etc/hosts

There's a website, www.example.com, that I tried to block myself from accessing because it wastes too much of my time. So I configured my /etc/hosts file. I added the following lines, to block the ...
3
votes
3answers
69 views

Linux, resolv.conf — adding MSDNS and Bind DNS nameservers where MSDNS isn't recursive?

How to resolve from a non-recursive MSDNS and if not found resolve from googleDNS (recursive)? ## resolv.conf ## nameserver 192.168.10.1 # msdns, non-recursive nameserevr 8.8.8.8 # ...
0
votes
2answers
101 views

ping not working for google alone

one of my friend changed some network config in my laptop at home, He said he tried something related to block a website(he tested it with www.google.com).Now www.google.com not loading . Even he dont ...
0
votes
0answers
34 views

named.run file deleted but data left on disk?

Today I had a name-server stop resolving DNS due to the /var directory being full from the named.run cache build up. I tried removing all the files using: rm -rf name* However, although running ls ...
1
vote
0answers
24 views

Deliver emails outside network, from a server behind router DNS and port forwarding

I've been trying to configure webserver to deliver emails outside the local network. Server is connected directly to the router and relay on its DNS service, and one of that online service for resolve ...
2
votes
1answer
211 views

How to check if port forwarding is enabled?

I have just set up a DNS server for my own network, and many guides online suggest to make sure that port forwarding on port 53 is not enabled. The thing that is not clear to me is this: should I ...
1
vote
1answer
199 views

Host home.lan.home.lan not found: 4(NOTIMP) error in bind9 (DNS)

I have been following this guide to set up a DNS server using bind9 on Ubuntu 12.04, but after all the configuration, when I run host -l home.lan I get the following error: ; Transfer failed. Host ...
0
votes
1answer
67 views

Make the DNS server update my host name

I have some sort of DNS server running on my router (running Asuswrt-Merlin, and I can run commands from another Linux computer by host name, i.e., ping web-server. However, when I change settings on ...
0
votes
0answers
110 views

Ping IP works, nslookup fails. New Kernel

I am compiling my own 3.14 kernel. I fear I may have left out some important networking feature to get DNS working. I can't resolve domain names. I can ping my DNS server. I can resolve using that ...
1
vote
1answer
107 views

How do I determine where DNS requests fail in the TCP stack?

I have the networking setup described here: Why is this static route not taking effect? Currently, I can ping my DNS server but all DNS requests fail: ~$ ping 130.35.249.52 PING 130.35.249.52 ...
1
vote
1answer
34 views

NSD Zone file wrong resolution

I've set up NSD with the following zone file: $ORIGIN ldom. ; my "Local DOMain" @ IN SOA lserver root.lserver ( 44 ;serial ...
2
votes
1answer
138 views

Cannot install BIND dns with yum on Oracle Enterprise Linux 6.1

I am currently using Oracle Enterprise Linux 6.1 to use for Oracle RAC. However I am stuck at installing BIND (DNS Server) at the VM I've set up. I've used the following command: yum install ...
3
votes
1answer
241 views

Debian cannot resolve hostnames

I have a problem resolving host names on Debian running on vmware. It just stopped working out of the blue. Somewhere after uninstalling percona server and deleting /etc/mysql . Initially it thought ...
4
votes
3answers
134 views

How do I generate SSHFP records?

I need to setup SSHFP records in the DNS for my host. I have done some searching but I haven't found any good example. What are SSHFP records? What does SSHFP records look like? How do I create ...
1
vote
3answers
189 views

alternative to nslookup in rhel7?

nslookup does not come preinstalled in RHEL 7 Beta. I noticed even dig and host was not pre installed. I read couple of links which mentions nslookup is dead/deprecated, so is there an alternative for ...
5
votes
1answer
95 views

What is the effect of setting the timeout value to 0 in /etc/resolv.conf?

In order to fix a problem with DNS resolution in a particular customer environment, their admin has suggested adding options timeout:0 to the /etc/resolv.conf file on their CentOS 5 server. The man ...
0
votes
1answer
56 views

How to check if all of dns resolvers are working? [closed]

How can I check if all of dns resolvers are working under linux console?
0
votes
1answer
1k views

CentOS 6 not regestering new hostname on Windows Server 2003

I rebuilt a Windows 7 Workstation with CentOS 6.5. The Windows 7 had a host name aaa attached to domain ddd.local. The new CentOS hostname is bbb. When I try to ping it: $ ping bbb ping: unknown ...
1
vote
1answer
19 views

configuration to listen-on different depending on the domain asked

I want to configure bind such that the host served differ depending on the domain asked. the use case is the following: it must respond to anyone if the requested domain is in the domain my server is ...
2
votes
0answers
321 views

apt-get update could not resolve addresses [closed]

When I run apt-get update (on Ubuntu 12.04) I keep getting these errors: Err http://security.ubuntu.com precise-security Release.gpg Could not resolve 'false' Err https://get.docker.io docker/main ...
1
vote
1answer
26 views

Installing Arch on VM - DNS Issues

I have been following the Install Wiki and I have arrived at the part where I need to install X Server. My issue is that I cant install X because my DNS doesnt work. I can ping 8.8.8.8 just fine, ...