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Questions tagged [a-record]

An A record is a type of DNS record that maps a name to an IP address. For example, the A record for serverfault.com is 64.34.119.12

261 questions
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Where does the "A" record go for a sub-domain?

I'd like to create a sub-domain, like sub.example.com. I have already configured example.com with NS "glue" records to point to the DNS server which will manage the sub-domain. They look like: sub IN NS other.dns.server.example.com. Where…
Christopher
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Best practices for managing the IP addresses you own in DNS and their PTRs?

I was wondering how exactly the big companies go about managing all the IP addresses that their public servers use, especially in respect to setting up correct PTR-records. This is very important, for example, when sending lots of email from…
Kevin F
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Multiple DNS records pointing to a single domain

Our business currently subscribes to a DSL internet connection. We're moving away from this and in fact will have two 3Mbps dedicated fiber connections run into our operations center in the coming weeks. The first fiber connection will be ready in 2…
JohnyD
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How would you setup a up an A record for any negative query?

How would I go about setting up an A record for in Bind9 for any negative queries? I want to forward our staff to an informational page if they were to visit a non existent domain. We have an internal caching server.
Kladskull
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A record required for MX record?

Previously our domain, let's call it ourdomain.com, pointed to an IP address (our web host). In addition, we use Office 365 to handle our domain email accounts. DNS records: ourdomain.com A XXX.XXX.XXX.XXX ourdomain.com MX 10 …
Dave New
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Windows Server 2008 - Zone Scavenging - "This zone can be scavenged after"

I have set up DNS scavenging on our Windows Server 08 R2 boxes as we had records in there that were duplicated and some dating back to 2004! I set the no-refresh and refresh-after intervals both to 3 days, zone scavenging is enabled on each zone and…
Myles Gray
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Avoiding downtime while switching CNAMEs with AWS's Route53

I'm trying to make a seamless transition from Heroku to AWS. Currently, DNS is being handled by Route53, with a CNAME record sending traffic to the heroku SSL subdomain. I need to change this to an A Alias record, pointing to the new Elastic Load…
Dan Fried
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How to set up CNAME to point to Azure

Here's the story. I have an application on azure. I would like to set up an A-record. My main domain is myhost.dk and my azure adress is myhost.azurewebsites.net. The Azure guide says that I have to set up a CNAME with awverify.myhost.dk to point to…
Kasper Skov
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Disable AAAA lookups in libcurl

We have a step during in of our large map reduce that does DNS resolutions. The application itself uses the c-ares library as well as libcurl. I notice that with each resolution, there is first an AAAA attempt, then immediately an A resolution. This…
Stephen Wood
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PowerDNS CNAME with multiple A records produces unexpected results

This problem from what i can tell is isolated to PowerDNS. The servers are running two packages pdns-static-3.0.1-1.i386.rpm and pdns-recursor-3.3-1.i386.rpm on the most recent version of Amazon Linux. The amazon ec2 loadbalancers are assigned a…
bwight
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CloudFlare offers DNS root CNAMEs. Any resolution gotchas to be aware of?

I'm not that familiar with the inner workings of DNS, preferring to just add my CNAMEs and A records as appropriate, and leave the behind the scenes to other services. I host a few sites on Amazon S3, which clearly doesn't allow you to have an A…
jvc26
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Do CNAME records overrule A records?

I have several A records like so: Subdomain IP Address example.example.com 198.51.100.0 example.com 203.0.113.0 And a CNAME record that looks like this: Alias Destination www.example.com example.com I want…
James
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How to set up a BIND DNS server to respond a single IP address to any request on Windows?

I want to configure a BIND DNS server (since Windows Web Server 2008 does not have DNS service, I had to install BIND) that responds any request with a single A record. I had set up a * record but it seems to work just for direct subdomains of the…
mmx
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Order of DNS A records and wilcard subdomains

I have read Multiple wildcard dns entries and know the limitations/drawbacks of wildcard DNS entries, but I have a question about the order in which it is listed by my registrar: example.com A 192.0.2.1 (1) test.example.com A …
Basj
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DNS not resolving for *some* people/locations

We created a new sub-domain (via A record) but it is not resolving for everyone. It's been working for me and some others for about a week, but others still cannot access the site. I don't think this is a propagation issue as we created the entry…
Justin Johnson
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