Tagged Questions

DNS stands for the Domain Name System, a hierarchical, distributed database where the keys are domain names.

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0answers
33 views

Why does RFC 2181 disallow MX record with a CNAME exchange?

According to RFC 2181 http://tools.ietf.org/html/rfc2181#section-10.3 10.3. MX and NS records The domain name used as the value of a NS resource record, or part of the value of a MX ...
12
votes
3answers
1k views

How does the HTTP GET method work in relation to DNS protocol?

I am trying to understand application layer protocols in TCP/IP stack. I know that both HTTP and DNS protocol stay at the top layer (Application Layer). So, when a browser wants to access a resource, ...
1
vote
1answer
26 views

OpenWRT router as a switch with DNS

We have a router (8 ports) that serves our church (it also is our modem with ADSL2 etc) and handles our DHCP services. I've needed to extend our network to accomodate another 2 ports, so an extra ...
0
votes
1answer
32 views

Domain has disappeared, but Route 53 and UptimeRobot report it is still fine

I registered a domain with 123-reg.co.uk. It sat there for 2 months and then around the 20th of October I transferred it over to Route 53. I am in the UK btw. The domain arrived at Route 53 on the ...
0
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2answers
65 views

Name Server with Multiple IPs

We have multiple internet connections attached to my company's network, from different providers, and there are authoritative name servers on the network as well, also with an IP from each of those ...
0
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0answers
75 views

Too many DNS zones. Need advise

So we have someone here who loves creating DNS zones. So much so that we now have 145 different zones. 80 of these have one A record each. It has gotten to the point where we can't find anything ...
0
votes
0answers
31 views

Issue getting DNS wild card A Record (*) working

I have a sub domain named subdomain under main domain named maindomain. Inside subdomain i have wild card (*) A Record that maps to a particular IP Address. This works fine and when i say ping ...
-1
votes
1answer
41 views

BSOD on windows server 2008 R2 reason Srv2.sys Driver_IRQL_not_Less_or_Equal [closed]

I have a issue that i have been facing with my windows server 2008 R2 (ADC Server) Additional Domain Controller (Roles Installed AD,DNS). It suddenly gives a BSOD i did analyse the dump and found out ...
1
vote
1answer
26 views

Channelizing logs on Bind 8

I am using the following channel clause in my named.conf, logging { channel named_log { file "logs-remote/bind.log"; severity dynamic; print-category yes; print-severity yes; print-time yes; }; ...
0
votes
0answers
30 views

Cannot connect via RDP/SMB via DNS?

We have a SBS (Windows Small Business Server) running DHCP and DNS. One of our VMs is a test VM. Due to security reasons, this VM is not inside the Domain and has no access to network drives etc. ...
-3
votes
1answer
25 views

Unable to point CNAME of subdomain of my website to it's tumblr blog in plesk [closed]

I created a tumblr blog for my website. And I want to host it on blog.mywebsite.com subdomain. Tumblr says that I should add CNAME instead of A Records to domains.tumblr.com. But the problem is that ...
0
votes
0answers
20 views

new dkim config -> opendkim-testkey: record not found

I am trying to set up dkim and I cannot get it to work or test properly, and I get the following error: opendkim-testkey -vvvv -d domain.com -s default opendkim-testkey: checking key ...
-1
votes
1answer
68 views

Yum PYCURL ERROR 6 - “Couldn't resolve host 'mirrorlist.centos.org'” [closed]

I am attempting to redo my server (CentOS release 6.6 [Final] x86_64) and I am now getting the following output on yum [root@server ~]# yum update Loaded plugins: fastestmirror, priorities, security ...
1
vote
2answers
14 views

How can I redirect requests for a site in IIS to a different external server?

I am about to move my website away from IIS to a Linux VPS. Part of this involves updating zone records. There will be some time from when I change my zone records to when they are propagated to ...
3
votes
0answers
55 views

What's the proper way to setup a domain name to not accept email?

RFC 5321 sec. 5 states that: SMTP clients must look up for an MX record; if no MX record for domain is present, look up for an A Resource Record (RR), and if such record is present, treat it as an ...
33
votes
10answers
3k views

Run antivirus software on linux DNS servers. Does it make sense?

During a recent audit we were requested to install antivirus software on our DNS servers that are running linux (bind9). The servers were not compromised during the penetration testing but this was ...
0
votes
1answer
30 views

Reviewing source of DNS requests

Is there a way to know the source of DNS requests which were handed to the Forwarder (requests which were handled by the DC are of no interest)? If I set up a BIND server which is a forwarder to the ...
-1
votes
1answer
13 views

MS Exchange 2003 to Google Apps Migration Domain Verification

My company just decided to move to Google Apps due to lots of technical issues with our Exchange 2003 server. I have just signed up for the free trial account for Google Apps and one of the first ...
2
votes
2answers
409 views

Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host

I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS. Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output ...
0
votes
0answers
30 views

Events ID 4013 For DNS and 1844 for Active Directory

I have newly registered a virtual private server (windows 2008 R2). My problem is when i install an Active Directory and DNS Roles, it raises events 4013 for DNS and 1844 for Active Directory. What ...
-1
votes
0answers
31 views

can't reach domain controller when internet interface is enabled [migrated]

What I want: -Windows Server 2008 R2 guest acting as Domain Controller, internet access optional -Windows 7 guest joined to the domain, with internet access. My setup is this: Server network adapter ...
2
votes
0answers
35 views

Openvpn server with bind9 DNS on AWS. Linux client cannot resolve host names.

I have a openvpn server set up and working on an AWS debian instance. It works as should but I want to push DNS queries to linux clients from bind9 which is on the same server as openvpn. All seems to ...
1
vote
0answers
36 views

Domain controller not appearing in DNS on any server but itself?

I have a site with a DC I want to decommission, and a relatively new one (promo'd within the last two weeks). I'm having trouble demoting the old server, and in the process of trying to figure out ...
7
votes
1answer
198 views
+500

Domain computer cannot resolve internal hostnames, but nslookup can

I have a Windows 7 computer on my domain that is behaving oddly. It is possible to ping www.google.com It can ping internal hosts using their IP address It can ping the local Domain Controller/DNS ...
0
votes
0answers
33 views

Access libvirt+KVM virtual machines with DNS

I have an Ubuntu Trusty machine running KVM + Libvirt to manage small virtual machines, and using the standard NetworkManager to connect to regular networks. I want to be able to access the virtual ...
0
votes
1answer
20 views

Adding a zone from a file via dnscmd - Microsoft DNS

I am trying to add a file backed zone on microsoft dns via dnscmd. I have a zone file in c drive, c:\Windows\zones\test.com.dns Upon entering the command, dnscmd /zoneadd test.com /primary /file ...
0
votes
1answer
20 views

After name server change, DNS queries on and off

I migrated the domain www.pantego.com to a different name server. We were using the Enom registrar and their default name servers, but I migrated them to AWS Route 53. I know all records were copied ...
-1
votes
1answer
25 views

Service/Port based DNS redirection? or variant [closed]

resolving a domain to a different IP based on port/service ex, mineplex.com redirects to one IP always when using a web client. But will redirect you to another IP when using a minecraft client. ...
0
votes
1answer
23 views

What should an s3 end point look like when configuring an ALIAS record in Route53?

I'm trying to point my root domain to an s3 bucket that redirects to www.mywebsite.com. However, when I try to configure my ALIAS record to point an s3 endpoint, the only endpoint that the dialogue ...
-1
votes
1answer
40 views

Would it be good idea to share DNS zone files via NFS?

Any expert advice on Bind DNS zone file transfer (master->slave) via NFS? Are there any drawbacks for not using Bind's zone transfer feature? Thanks a lot!
4
votes
2answers
131 views

Scale HAProxy for more than 64k websockets

We are trying to design an architecture that will be able to handle more than 64k websockets. We first tried with Amazon ELB, but its design doesn't allow unexpected spike of traffic nor websocket. ...
0
votes
0answers
19 views

Oracle GNS (Grid Naming Service) Breaks DNS

Am running a 2-node Oracle 12.1.0.2.0 ASM Flex Cluster using Oracle GNS which I believe uses zeroconf to create it's adhoc network. Before GNS starts, DNS works, i.e. nslookup, dig, ping, ssh all ...
0
votes
0answers
6 views

'550 relay not permitted' problem with MDaemon [closed]

Not being a pro webmaster I have problems with company mail server. We do have a web-site virtually hosted. We also have an MDaemon in our office as a internal mail server that sends emails out as ...
0
votes
1answer
50 views

DNS or Virtual host issue to open abc.com and www.abc.com

I'm facing issue with Linux VPS. Whenever I'm clicking xyz.com, it is working fine. Whenever I'm trying to click www.xyz.com, it is opening firstly configured website on virtual host. I configured ...
-4
votes
2answers
38 views

why online tools can not find my MX record? [closed]

i have these dns records on my server xxx.com MX 10 mail.xxx.com. mail.xxx.com A 192.168.xx.xx i can send and receve email but when i test my dns with online tools i ...
4
votes
1answer
246 views

Any semblance of originally-requested domain name in HTTP, post DNS-resolution?

My understanding of how DNS resolution and web browsers work is as follows: Your browser uses the DNS system that ultimately connects it to your registrars name servers Your registrar's name servers ...
0
votes
0answers
13 views

Using dnsmasq for local hostname [migrated]

I'm having some trouble with my dnsmasq setup. All I want it to do is resolve certain hostnames to certain ip addresses for any machine on my network. More specifically, I'm trying to enable all ...
1
vote
1answer
53 views

How to edit domain's nameservers when no service “takes responsibility”?

I think I may have made a mistake when migrating my DreamHost registered domain to Amazon's Route 53 service. I didn't modify the DNS settings on DreamHost's end during the migration. So now, my ...
0
votes
0answers
25 views

Proxy all requests to domain.tld

Here's the situation: I want to direct all requests to to a proxy server. One idea I had was to force the DNS server to respond to the request for domain.tld to the server running the proxy server ...
1
vote
2answers
35 views

Parent zone does not provide glue for nameservers

We have two domains: gignouser.com clouds.host we have created two A records: ns1.eu.clouds.host ns2.eu.clouds.host Both of these servers host the DNS for both domains, and are listed a ...
-1
votes
3answers
164 views

How to flush DNS resolver cache on Linux (and FreeBSD)

I am admin for several Linux and FreeBSD servers and here is a problem I have: The servers run a tool that does a lot of DNS queries every minute for the entire network. When it does a query, the ...
-1
votes
3answers
49 views

Forward the root domain to the www subdomain using DNS records

I have www.mydomain.com pointed at an Azure Website. www.mydomain.com --- CNAME --- mydomain.azurewebsites.net When I visit www.mydomain.com, everything works fine. This is good. Problem is, ...
0
votes
1answer
24 views

which domain do I setup DKIM on?

I'm trying to set up DKIN on for my organizations bulk mailing operation. Our bulk mailer is on one domain, test-news.org but all our mailings have user@test.org on the from line. I'm confused as to ...
0
votes
1answer
27 views

Curl to self using fully qualified address

I'm running a Virtual Private Server to host some websites. I have a PHP script that tries to fetch resources from the server, essentially using a curl command to the server ...
0
votes
1answer
46 views

Please help to understand : ping

Am using ubuntu 13.10 I have used ping before to check server is up/down. but Just today found this accidentally, and I don't understand why this happens. Can someone mind to help to understand, as ...
0
votes
1answer
60 views

Centos 7 with SElinux: openvpn and DNS

I'm trying to use openvpn as client on centos 7. It works fine, but i cannot get DNS from server. As you know, there is no resolvconf in new Centos, so, standard update-resolv-conf script doesn't ...
1
vote
1answer
29 views

DNS Zones: criteria to create new zone delegations

If I'm not wrong, within a domain name a company owns, their administrators have complete freedom to create as many cuts (zone delegations) inside the domain tree as he wants, but, inside his own ...
-2
votes
1answer
34 views

How does a resolver know a DNS response is authoritative?

The title says everything about me question. How does a resolver know the response comes from an authoritative name server? An equivalent question: what flag or field is marked by a name server to say ...
0
votes
0answers
29 views

Windows Server 2008 consuming a lot of bandwidth

My Windows Server 2008 has been consuming A LOT of bandwidth in the last days (990 GB). This is a development server so it should not consume more than 100mb aprox. We noticed this after the server ...
-3
votes
2answers
41 views

Two Servers one Domain - What about DNS? [closed]

I have a website mywebsite.com/forum If you type mywebsite.com in your browser, you will be redirected to mywebsite.com/forum through a script. Now, I want to have a blog on the main page ...