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

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Optimzing Web Server

I'm trying to increase connection speed and at the same time reduce server load for my web application. I'm looking at setting up something similar to a CDN (Content Delivery Network) but that's able ...
1
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15 views

Redirect traffic from one server to something.cloudapp.net (CNAME)

Through out North America, we have lots of legacy devices, which sends data to our server which has static IP Address. Now we are moving to Azure cloud services, and as you know they do not guarantee ...
2
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2answers
111 views

Forward all TLD requests to another server

So, an emergency has been landed in my lap, and unfortunately I'm ill-equipped to deal with it. An IT tech for a client's company changed the A record for a domain, then went on holiday. He is the ...
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1answer
40 views

Namservers (NO GLUE) on .EU domain [on hold]

I have two cPanel accounts with two different domains. one is sunrisetrip.com and the other sunriseholidays.eu. Both have the same nameservers, both are bought from the same registrar. the .com domain ...
4
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2answers
201 views

Nameserver working for all TLDs except .org

I've recently set up a private name server (ns1.mediamechanic.net / ns2.mediamechanic.net), and it appears to be working for everything except our .org domains (see obapps.org). As far as I can tell, ...
1
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2answers
14 views

Postfix sending and receiving in strange way.

I have an email server, running on CentOS 6.5, 32bit system, with Postfix and Dovecot running along all their dependencies. Let's assume my domain is www.anw.com I have created A record in this ...
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2answers
17 views

Handling emails in a separet email servers

This is a problem about maintaining an all-email VPS server. First, I have two VPS hosts right now, both running CentOS 6.5, 32bit system. one for web hosting and other for email only. The reason ...
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1answer
12 views

Custom domain, DNS A Record Breaking old URL Paths [on hold]

I'm working on for a client and we created a website using a CMS template called Virb.com (sort of like squarespace.com). To get his custom URL to link to his new website, we needed to change an A ...
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1answer
25 views

Installed RBLDNSD for making a custom RBL but something is missing, could you help us?

We have successfully installed RBLDNSD with the idea of having a custom RBL server. Now we have started to make some testing adding some IPs to the our blacklist, and also have configured Exim (Cpanel ...
1
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0answers
20 views

DNS Registration Using Non Windows DHCP

We are searching for a solution for our VPN users. We use a Fortinet SSLVPN. The Fortinet appliance issues DHCP to our clients. It is configured to have the clients use our internal Windows DNS ...
0
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1answer
17 views

Windows DNS dnscmd.exe SecureList syntax

DnsCmd let's you provide a list of nameservers to allow for secure zone transfers, however providing a list like 127.0.0.1 10.0.0.2 10.0.0.4 causes the machine to consume memory and CPU until it ...
0
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2answers
42 views

How does Cloudflare know about my Subdomains?

I just signed up Cloudfare and they showed me a list of my subdomains by scanning my domain. How do they do this? What technology is used to scan all subdomains related to a root domain?
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7 views

maraDNS NON-AUTH timeout

I've set up maraDNS to provide my own DNS records. I've pointed the domain nameservers at my registrar to ns1.domain.co.uk and ns2.domain.co.uk (using domain in place of actual domain name). I cannot ...
1
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2answers
23 views

Cannot access my GitHub Pages website by IP Address

My custom domain works with GitHub Pages but I would like to understand how it actually works. For this example I am not using my custom domain at all. My GitHub Pages repository does not ...
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0answers
45 views

IPTABLES: why does accepting outgoing DNS on port 53 bring down my websites?

I have a handful of websites running with Apache. I've installed Sendmail and am trying to configure IPTABLES to allow outbound emails. When I allow output DNS with the following command, I can send ...
0
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1answer
14 views

Bind Requested DNS Server IP Log

I have a DNS Server which runs on a virtual linux box with several IPs. Bind provides some pretty detailed debug logs, however, one piece of information that doesn't seem to be logged is the requested ...
3
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2answers
43 views

Enumerate Windows DNS Server Zone attributes via shell

I'd like to use a command-line tool to list a (primary) zone's configured secondary servers, if any. Dnscmd comes close with: dnscmd server /ZoneResetSecondaries:[list of secondaries] But, I ...
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0answers
17 views

Domain Controller's DNS NIC configuration [duplicate]

I've seen conflicting information on this online, but say you have an environment with two domain controllers: one Forest, one Site, one Domain; simple as it gets. How should each domain controller's ...
0
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1answer
23 views

How to redirect custom urls to some local IPs with pfSense [on hold]

I'm using a pfSense router and I'm desperately trying to configure a custom url (eg: myurl.ext) that should be mapped by pfSense to a local server (eg: 192.168.0.x). Like I do with my /etc/hosts and ...
1
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2answers
28 views

Vanity name servers with .no domains

I created vanity name servers e.g. ns1.example.com and ns2.example.com that are just maskеа and are pointed to rackspace free dns service. In other words ns1.example.com points to ...
0
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1answer
41 views

Forwarder dns not resolving reverse lookups

I have created one new dns server in lab and its working properly. Earlier we were using another dns server for lab pc's as 10.20.30.xx. which is outside the lab premises. now issue with newly created ...
1
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1answer
15 views

Locally resolve a name in a DSN lookup (Host not found: 3(NXDOMAIN))

I have a Ubuntu 14.04 Server virtual machine in which I would like to resolve a symbolic name to an IP address locally (i.e., the machine itself should provide the mapping). The mapping is the ...
0
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1answer
22 views

Delegate NS resource record of IPv4 subnet

Is it possible for a reverse zone to name another DNS server in the NS record? I want to delegate DNS for all addresses within a subnet to a site using that subnet. Our office leases a subnet which is ...
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1answer
38 views

Way to find all domains that have a CNAME to my domain? [closed]

I have a web service that allows users to white-label our software by using their own domain over ours. This is done by the user adding a CNAME record from their domain to our domain. Is there a way ...
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2answers
29 views

AWS SES TXT Record Content

I need to get AWS SES setup for a domain. The registrar's DNS tool only allows me to put in a block of text for the TXT/SPF records (one block per record). I'm not sure how to format the TXT record as ...
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1answer
23 views

How can dns be used to cross-redirect sites [closed]

Two sites, a.com and b.com are independently hosted, owned and operated. Each has its own database which is synchronized with the other. If a.com is down, it automatically redirects to b.com, and vice ...
1
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1answer
33 views

BIND DNS zone coalfired.net/IN: coalfired.net.coalfired.net/NS 'ns2.thirteen.pm.coalfired.net' has no address records (A or AAAA)

Since I updated my BIND DNS server I seem to be having problems with it. For some reason, when I try to start the server I get errors such as this appear: zone coalfired.net/IN: ...
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0answers
13 views

Second FTP Server On Subdomain [on hold]

I've my own domain name that I'm trying to set up with two FTP servers. (I have two totally independent FTP servers I want to be able to access.) I set one to run on the standard port, 21, and the ...
6
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3answers
183 views

How to prevent Bind from responding to spoofed IP addresses?

We all know about open resolvers, this question is kind of for the inverse situation. I have a DNS server that is locked down to certain CIDRs acl trusted {[..] options { [..] allow-query { ...
1
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1answer
58 views

Another domain points to my webserver

Somebody else has registered a name pointing to my webserver's IP address in .ma TLD. My domain foo.bar -> my ip address 1.2.3.4 Somebody defined: suspiciousdomain.ma -> my ip address 1.2.3.4 So ...
0
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1answer
37 views

Sender address rejected (mx record not found)

I am using both Exim and Office 365 to send email - the server sends automated mails from an application using Exim and Office 365 handles day to day user and incoming email etc. I am getting some ...
3
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2answers
46 views

What is the role of NS records at the apex of a DNS domain?

$ORIGIN example.com. ; not necessary, using this to self-document $TTL 3600 @ IN SOA ns1.example.com. admin.example.com. ( 1970010100 7200 1800 1209600 300) @ ...
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1answer
54 views

Can ping and browse IP, FQDN, and hostname but can't browse via SMB to hostname of server

Got a strange problem where on a server 2008 machine I am trying to browse to another server 2008's shares on a different site. I can ping the server's ip address fine, I can ping the servername ...
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0answers
9 views

How do I configure winbind to only register some interfaces with DDNS?

We are running an Active Directory. The hosts joined to the domain are a mix of Windows machines joined natively and Linux machines joined using winbind. All hosts have statically configured IP ...
0
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0answers
16 views

DNS-SD registration of “printer_queue1” failed with -65548

I get this message from logs i am not sure that its the avahi daemon or some networking issue communicating to the DNS servers. How can i find if this an issue with avahi daemon or CUPs server in ...
0
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1answer
67 views

What steps to do to set the DNS PTR record, is the IP in reverse in the name needed?

I had the following error: <xxxxxxxxxxxxxxxx@xxxxxxxxxxxx.de>: host yyyyyyyyyyyy.yyyyyyyyyyyyy.de[33.33.33.33] refused to talk to me: yyyyyyyyyyyy.yyyyyyyyyyyyy.de (mxeue106) Nemesis ESMTP ...
0
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1answer
36 views

Setting up DNS on reverse proxy

I have a backend that used to be my front end. Now my front end is an nginx proxy server. It just serves as an http and an IMAP/SMTP proxy. The backend services apache,mysql,dovecot/postfix. Since I ...
0
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1answer
43 views

How should I setup DNS for Godaddy -> Dreamhost -> Heroku

I have a domain registered with Godaddy - tipthismuch.in Previously I has this pointing directly to Heroku with a CNAME record. I wanted to get email setup under this new domain, instead of paying ...
0
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0answers
18 views

Serving both Google App Engine applications and existing Joomla! website under same domain?

I currently maintain a web site with Joomla! hosted at my ISP. Say its domain name is example.com. WHOIS lists my name as administrative contact and two names at my ISP as technical contacts. I also ...
2
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3answers
122 views

Why DNS through UDP has a 512 bytes limit?

I have been looking for an answer to that question (the one in the title) and the best thing I've found was: In DNS Protocol design, UDP transport Block size (payload size) has been limited to ...
0
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1answer
30 views

Setting MX entries for Failover [closed]

I have a GoDaddy domain as "example.com". I wanted to have my own DNS server for the sub domain secure.example.com. So I added a "A" record "NS" pointing to my IP and a NS record "Secure" pointed to ...
0
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1answer
40 views

Internal DNS and software/services resolving external IPs

So, on my network is a DNS server with an external zone (public IPs for servers) and internal zone (LAN IPs for servers). When I perform an nslookup on a server in the zone it resolves the local IP ...
0
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0answers
12 views

Can winbind influence name resolution in Linux

I have to Linux boxes on vagrant, the have the same /etc/resolv.conf and /etc/hosts, but one is using winbind to do SSO with Active Directory. When I try to resolve the domain controllers with: dig ...
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1answer
39 views

How can I make my Local Server accessible via hostname? [closed]

I've set up an Ubuntu Server with LAMP. Now I wish I could access it from the other computers in the network just by typing http://hostname/ in the browser. Is it possible without setting up a DNS ...
0
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0answers
18 views

How to add domain to this existing SPF entry, which has multiple IPs and Domains [duplicate]

I have an existing SPF record in my DNS setup with something like the following: v=spf1 ip4:202.100.100.100 ip4:103.100.100.100 a a:test.com a:mail.test.com a:testy.co.nz a:mail.testy.co.nz mx ptr ...
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2answers
55 views

Why BIND does not use the forwarders any more?

BIND does not use the forwarders to resolve any more. It just goes to the root servers. I do not know when this started happening since everything worked transparently, but for sure bind configuration ...
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votes
1answer
42 views

Is there any affinity between IP subnets and DNS domains? [closed]

I understand what DNS and name servers do. But one question that I have is whether there are any technical, or convention oriented, relationships between DNS domains and IP address space. ...
0
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0answers
7 views

Trouble with dhclient and dynamically updating reverse maps

Has anyone been able to get dynamic updates to in.addr-arpa zones working via linux dhclient? I can get forward maps to update # service network restart Apr 7 15:25:24 i-d40976dd dhclient[26054]: ...
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1answer
38 views

CNAME to Amazon does not resolve

I see a lot of people using IP addresses like, ec2-54.208.90.77.compute-1.amazonaws.com Just for reference, that's my actual instance IP address. However, when I try I get, $ nslookup ...
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1answer
27 views

Why does Microsoft's own Sender ID wizard generate a SPF record instead? [closed]

I'm trying to create a Sender ID record for TurboLab.it with Microsoft's own Sender ID wizard but the wizard always return something like v=spf1 a mx ptr ip4:95.141.32.205 -all: this looks like SPF, ...