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

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Move mail server to a new server with no downtime

We have a server that currently acts as a web, database and mail server. We would like to move mail to its own dedicated server. So: The address for the mail server is mail.example.com. It has A ...
4
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2answers
1k views

Are PTR records added only by the ISPs that provide and manage the IPs?

I checked out with my DNS provider to change the PTR records: Dear Sir, We can not modify the PTR records of the IP addresses that you provided, because these IP addresses are not managed ...
3
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1answer
50 views

Proper way to create an NS record in Windows DNS

In BIND, you create an NS record that points to an A record: labs.example.com. IN NS ns1.example.com. ns1.example.com. IN A 192.168.80.50 In Windows DNS, you are first asked to provide the Domain ...
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1answer
103 views

What should be my MX records for postfix configuration like for mail forwarding?

I have a Digital Ocean VPS, at which I installed postfix. I want to do mail forwarding. When I installed postfix I picked No configuration option. Later I set up the following: I created main.cf at ...
2
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0answers
100 views

Windows DNS clients can't update PTR records, but can update A records (not ACLs)

I have clients configured via GPO with the following settings enabled: Dynamic Update Primary DNS Suffix Register DNS records with connection-specific DNS suffix Register PTR Records: Register I ...
6
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3answers
633 views

DNS servers already use anycast. Will adding more IPs enhance scalability?

RFC 1034 requires us to assign at least two IP addresses for DNS servers. However, redundancy can already be achieved by a single IP address if we use anycast addressing. BGP anycast seems to scale ...
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2answers
30 views

Dns: two pointer (PTR) with same IP resolve to different hosts

I have a Windows 2003 domain. DNS server and DHCP server run on domain controllers. Most workstations have DHCP enabled. Sometimes I have weird network problems and when I diagnose them I can find ...
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3answers
115 views

Internet connectivity with Domain Controller

We have a Windows 2008 R2 Domain controller and every PC on the network has the IP address of domain controller set under DNS settings. Is it normal to have the Domain controller also be the DNS ...
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1answer
35 views

Redirection of ports based on domain name via pf

We have a public facing IP on a machine (machine1) running pf firewall. We have multiple machines behind that firewall in a lan. On machine2 in the lan we have a service running on port 443. To make ...
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1answer
65 views

Making a reverse zone file on a 255.0.0.0 subnet

I’m trying to setup a reverse zone file for this subnet that has two hosts on it: 10.10.100.10 and 10.128.5.10. This means he netmask for the subnet would be 255.0.0.0. I inferred that the file name ...
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1answer
50 views

How to create custom nameserver that points to another name server?

Example I use amazon Route 53 Amazon gives me DNS such as ns-111.awsdns-36.net ns-222.awsdns-13.org ns-333.awsdns-53.co.uk ns-444.awsdns-20.com But I want to create my own custom nameserver alias, ...
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1answer
36 views

Configure DNS on sub-domain for testing web site on dynamic IP

I am running a web site on a dedicate server at IP 12.34.56.78. The DNS is configured like so: * A 12.34.56.78 @ A 12.34.56.78 @ MX 10 mail.mydomain.co.uk ...
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49 views

Domain PC Logon Server not correct

my production environment I have one parent domain controller three additional domain controllers (ad.domain.com, bjpdc.domain.com, dlpdc.domain.com) and multiple child domain controllers ...
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1answer
79 views

can I use DNS with private NAT addresses?

I want to build a service that dynamically creates VMs and assigns each VM a public DNS record which could be a full domain or a subdomain. Assume the VMS all live on a single host. The VMs will have ...
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1answer
37 views

Configure Bind9 master zone to accept all third levels of domain [duplicate]

I tried for several hours configuring a Bind server on Debian 7 in order to obtain this: *.example.local. I need that every third or fourth level for "example.local" (for example: abc.example.local, ...
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1answer
112 views

PowerDNS Master Slave Transfer method

I would like to know which is the better option to transfer the domains & their updates between a master & slave PowerDNS server. I have seen many old posts from 2006 saying using the MySQL ...
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1answer
54 views

CNAME domain nslookup refused [closed]

I have a domain1.ir configured in my dns server as a master zone domain. This is my dns records for this domain: $ttl 1H domain1.ir. IN SOA dns.domain1.ir. info@domain1.ir. ( ...
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3answers
175 views

Active Directory - List ISP DNS servers as Forwarders?

Background: I have a relatively small Active Directory domain (Windows 2003 Functional level) with two domain controllers, both running DNS servers. They are the primary and secondary DNS servers ...
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1answer
161 views

Is it possible to receive inbound emails using Mandrill?

I am using Mandrill mail server for sending emails to users and I have my own domain added to Mandrill to send out mails. Suppose I have configured Mandrill to use info@mydomain.com to send out emails ...
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2answers
69 views

cname vs 301 redirect on namecheap

I am having trouble figuring out my DNS record types. I want the www subdomain to be my "canonical" page, so my configuration looks like this: www A record type actual ip address @ 301 ...
3
votes
2answers
96 views

No SOA record — what are the implications?

I was investigating a bunch of spam domains, and none of them have an SOA record. I have never seen this before -- I didn't even know it was possible. How can DNS work without an SOA record? If it ...
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1answer
20 views

PTR entry is setting my hostname. How do I stop it?

I'm running RHEL 6.5. My machine is getting it's IP address from our DHCP server. I'm getting this strange behavior where the machine will apparently query the DNS server for a PTR entry for the IP ...
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1answer
37 views

What domain to set in rDNS

I have a few different domains on a shared IP address. One of them is having trouble sending email, as certain mail servers reject the email for not having rDNS set up properly. The thing is there ...
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1answer
60 views

RHEL5 - Bind doesn't return IPv6 records

I've got two DNS resolvers: RHEL5 - BIND 9.7.0-P2-RedHat-9.7.0-17.P2.el5_9.2 RHEL6 - BIND 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4 The configuration is exactly the same, both DNS servers are not ...
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2answers
172 views

Setting up SPF records on dedicated server

I have a question in regards to SPF records in a dedicated hosting environment. I wish to set up an SPF record for my dedicated server, but I am not sure whether my understanding is correct. First ...
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0answers
32 views

Unbound not forwarding query

Im having some trouble getting Unbound to forward queries correctly. My current unbound.conf looks something like this: forward-zone: name: "google.com" forward-addr: 8.8.8.8 ...
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3answers
57 views

Routing to multiple apps in a LAN with domains.

I have a handful of apps running on a couple of boxes in a LAN. All the apps use different ports. For simplicity let's say I have two apps on one server, apache serving at 8080 and tomcat at 9292. ...
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1answer
52 views

WEB page loads only with second attempt - DNS issues

I'm having this issue that I've never run into and wanted to ask the community for help. I think I may be missing or overlooked something small. The issue I'm having is that I try to hit an external ...
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3answers
95 views

Pros and Cons of dedicated Load Balancer vs Round Robin DNS [closed]

2 Apache web servers with identical vhosts to serve a few hundred clients. RHEL 6 on all boxes. What are the pros and cons to having a load balancer with a VIP, and pointing all of the DNS A records ...
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0answers
96 views

Setting Up DNS Correctly on a VPS w/ Subdomains

So, I'm working on migrating my website (Forums, home page, custom html scripts ect) from a Shared Host over to a VPS. I'm completely new with a VPS and spent a few days reading up and researching ...
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2answers
63 views

IPv6 address not available from outside

Since Hetzner pretty much doesn't give out any IPv4 addresses, no matter what the reason is, I decided to give IPv6 a try. These is the assigned IP address subnet mask IPs: 2a01:4f8:190:5112:: /64 ...
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2answers
199 views

My AD domain and DNS domain names are the same. Can this be resolved with SRV secords?

My company has a website with the domain name of acme.com. It also used acme.com as the AD domain name. External DNS is set up properly. Internal DNS has to resolve to the DC, for obvious reasons. As ...
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0answers
67 views

Debian server - DNS stopped working after static IP reassignment

Due to changes in the LAN router, I had to modify the static IP of one of our servers. It still succeeds in finding the external world (ping google.com), but only temporarily - when I access one of ...
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2answers
39 views

NS what to type in while registering domain name

I want to register a domain name, so they asked me to type in 2 NS-servers, I want to use my BIND server for that. I've got static IP, let it be xxx.xxx.xxx.xxx. If I type in my xxx.xxx.xxx.xxx into ...
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1answer
56 views

How to host an Apache based site alongside an IIS based site?

I've inherited a simple small business network which has a single SBS 2003 server running Exchange. It's currently set up so that the domain name mail.company.com maps to the server IP, so email can ...
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1answer
37 views

Preventing Domain from using VPS IP Address and Display its content [closed]

how can i prevent user from displaying contents of my vps. Currenty, I have an Ubuntu-powered vps and I install wordpress blog on it which is intended for my domain1.com. I know its possible to use ...
0
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1answer
278 views

DNSMasq vs Bind for simple dns url blocking

I am building a dns server that will block access to specific websites by returning an incorrect ip address for a domain. Currently I use DNSMasq to perform this however my list is quiet large and I ...
0
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1answer
214 views

Windows Server DNS with non-Windows (Linux, Mac) Computers [duplicate]

How do I get my non-Windows (Linux, Mac) computers to properly register their IP address into my DNS server? Server Name: AD1 OS: Windows Server 2008 R2 Roles: DNS, AD, DHCP DNS SETTINGS Dynamic ...
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2answers
110 views

BIND9 DNS with external view inside the internal view

I'm planning a new BIND9 DNS Server with a special kind of view. We a have a lot of external zones and public IPv4 addresses. To keep things simple we have a subzone of our external domain just for ...
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votes
1answer
61 views

Some computers in my subnet do not recognize names of other pc's

I have two subnets: 192.168.0.1-255 192.168.50.1-255 Ewerything works via VPN (because physically computer from both subnets are in different locations). We also have active directory. Now, the ...
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2answers
148 views

What could cause DNS to un-propagate?

I moved a Godaddy domain (ihearthawaii.com) to a digital ocean droplet around 15 hours ago. Tracking the DNS Propagation through sites like (whatsmydns.net), I notice that the propagation is ...
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1answer
65 views

Integrate TURN|STUN with XMPP

How do XMPP clients find TURN or STUN servers? XEP-0215 isn't supported (by any servers or clients afaik), but XEP-0176 suggests using XEP-0215? I am running both an XMPP and TURN server, and I would ...
0
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1answer
374 views

Postfix/smtpd: Client host rejected: cannot find your hostname

I'm trying to set-up a mail server, using postfix and dovecot. Everything works fine, and I can connect in IMAP using Mozilla Thunderbird. But when I'm trying to send emails using the smtp server, I ...
0
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1answer
21 views

Is VirtualHost Entry Required for CNAME Pointing to Same DocumentRoot?

www.example.com. 1800 IN CNAME example.com. other.example.com. 1800 IN CNAME example.com. Which method is correct in Apache when all entries point to the exact same ...
3
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3answers
201 views

Best way to add a DNS wildcard record for a domain

What is the best way to add a DNS wildcard record for a domain? I want example.net, www.example.net, a.b.c.www.example.net, ... going to one server. Now I use: example.net. 60 IN A ...
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2answers
44 views

Hosting server IP address doesn't match A record but still resolves, website loads ok?

Pretty confused by this, I have a website which is on a Fasthosts shared hosting package, the server IP is 213.171.xxx.x However when you do a DNS lookup the A record is a completely different IP ...
2
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0answers
2k views

server can't find XXX.in-addr.arpa: NXDOMAIN

I am facing problem while configuring BIND DNS sowing server can't find XXX.in-addr.arpa: NXDOMAIN while reverse dns check! everything works on forward DNS lookup but reverse DNS lookup fails. Here ...
0
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1answer
75 views

Forward DNS queries of a subdomain to another port

I have some software which provides dynamic information via DNS, similar to a DNSBL. How do I run it on the same server as a BIND server that's also serving DNS requests for other domains? I just ...
0
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1answer
59 views

My site is showing an error that I believe is generated by an unrelated website. Is this a DNS issue?

I recently transferred my domain to GoDaddy (garrypettet.com). Everything seemed to go smoothly. I have a server with DigitalOcean, managed by ServerPilot. The website was fine until a few moments ...
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votes
2answers
110 views

Can't ssh to CNAME'd hostname

Why can't I ssh using the hostname specified in my CNAME record? I can ssh in just fine when I use the hostname it points to. It's been more than 72 hours. I've got a domain "mydomain.com", and it ...