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Questions tagged [domain-name-system]

The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names. Questions involving publicly accessible domains should include the real, Fully Qualified Domain Name (FQDN)

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SPF record permerror showed in an email header, but no reason for it

Our customers are complaining about the spam issue. There are a number of spam emails which did not flag as spam emails, which means our SPF record does not work. We have set up the SPF record in our ...
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1answer
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I have a domain name, How do I point it to my local Windows server running IIS?

I have a domain name from GoDaddy, How do I point it to my local Windows server so that the application running on 10.0.3.89:8900 can be seen by the whole internet ? How do I juggle bindings, Do I ...
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0answers
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Different nslookup answers on different clients in local network with local DNS

Situation: I have a few clients in a local network. I have a server named amp003 with IP address 192.168.4.13 I have two DNS servers (each one on relative DC server). On client 1 I did following: ...
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0answers
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Conditional Forwarder being ignored

It seems that DNS conditional forwarders are being ignored on a Windows 2012R2 server and I can't figure out what is going on exactly. Situation as is explained: There are two sites A + B with two ...
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0answers
11 views

GCE DNS forwarding

I'm trying to setup local DNS forwarder for the VPC network to use LDAP controller which is running DNS server. I have few GCP projects which should be able to communicate over already built VPN ...
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1answer
20 views

wildcard sub domain internal URL rewrite

I am trying to achieve URL like GitHub Pages. whenever user will visit username.example.com internally it will respond from localhost:80/username I am giving some example So that it will make the ...
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0answers
28 views

DNS setup for multiple hostings

Suppose the following situation. We have a SaaS product (e.g. example.com) where users can create accounts so they are available as subdomains: account1.example.com, account2.example.com, etc. We ...
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2answers
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Postfix not resolving MX record

Log to=<x.y@example.com>, relay=none, delay=21311, delays=21301/0.04/10/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=localdomain type=MX: Host not ...
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2answers
36 views

SPF: Multiple Mailserver

I have a domain with this A record: A 1.2.3.4 And a record for mail like this, I have my mail services at a different hosting provider for exchange. MX mxpool.example.com Now I want to set up a ...
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1answer
34 views

browsing to AD domain displays sysvol from remote DC

Five-site company connected with low-latency layer 2 or IPSec tunnels, 2 DCs at each site. I have noticed that browsing to \\domain.tld often displays sysvol/netlogon shares from a remote DC. The ...
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2answers
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Website not working on some IPs but is working on others

I have been at it for a few days now but cannot seem to resolve the issue. My website is abc.com. I was not able to access the website from home and thought it was down but it turns out that I could ...
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Suspicious DNS query leads to “Intrusion protection alert” on Sophos UTM

A customer Sophos-UTM reports Intrusion protection alert warnings INDICATOR-COMPROMISE suspicious .null dns query: 2019:01:15-11:54:13 utm-ba snort[31619]: id="2101" severity="warn" sys="SecureNet" ...
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2answers
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Windows 7 and two BIND9 nameservers

The setup: Two BIND9 nameservers (running on Debian 9.6) Windows 7 workstations as DHCP clients, the two nameservers acquired via DHCPD (option domain-name-servers 10.0.0.1, 10.0.0.2;) Now, at least ...
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1answer
34 views

Setting CNAME - doesn't like the period at the end

I created a CNAME record with the period at the end. I use bulk register and this is for the domain windward.net. But when I go to the url http://wiki.windward.net it takes me to http://wikitoohana....
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1answer
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How can I redirect mydomain.com traffic to www.mydomain.com without affecting email?

I'm very new to this so bear with me. I have a NameCheap account for DNS, an Amazon AWS Elastic Beanstalk account for hosting, and a Google GSuite account for email. I want to set up my DNS so ...
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1answer
35 views

Samba and router DNS setup with custom DNS

I would like to use samba on ubuntu 16.04 as an AD DC. I use custom DNS servers (OpenDNS). How should I set the DNS settings up? (e.g. my router's address is 192.168.1.1, the server is 192.168.1.2). ...
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0answers
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Send a negative response to any AAAA DNS lookups

Neither my local networking equipment neither my ISP support IPv6. While some applications support restriction of DNS lookups to IPv4 addresses some others don't so these applications end up waiting ...
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0answers
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AWS VPC EC2 Setting AD DNS Custom DNS for instance running in another VPC

Here is my scenario: 1. I have two peered VPCs VPC1 which is running Active Directory integrated DNS Service with my domain as example.local. There is another VPC2 which has both VPC DNS with ...
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1answer
29 views

Host discovery in AWS VPC

I just have a basic question. What is the recommended way to handle automatic host discovery in an AWS VPC? I have these Servers running and I want to figure out a neat way to skip having to configure ...
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0answers
26 views

pi-hole acting as nameserver for a domain? [on hold]

I feel that I may be making a mistake in my plans to host my own DNS for a domain I own. I want devices within the private network to all have subdomains to my main domain, e.g. laptop.example.com, ...
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2answers
54 views

One server, multiple subdomains pointing to different ports [on hold]

I have a VPN network at home, which I'm using for multiple things. I'm running the OpenVPN Server on there, alongside multiple http servers, like Jenkins, WebLogic, etc., and a DNS server, which ...
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0answers
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OpenVPN access domains hosted behind the same router [on hold]

I'm running an OpenVPN server on an ASUS RT-AC88U router. The router is configured and is working correctly. I can access the Internet over the tunnel as well as the local network computers by their ...
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0answers
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How can I put a dns record on a certain url in hostgator?

I want to be able to make the following redirect: https://my-domain.com/x --> https://subdomain.my-domain.com/x https://my-domain.com/anything_other_than_x --> https://subdomain-2.my-domain....
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0answers
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How would an XMPP client and server work over non-clearnet domain names? (.bit, .emc, etc.) [closed]

I'm thinking of buying a non-clearnet domain name to host an XMPP server and I was wondering how I'd get an XMPP client, with its registration and connection screen requesting a server address/domain, ...
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1answer
20 views

Workaround for setting up a PTR record for home hosted domain [closed]

I have a mailserver running at home. Some external domains refuse to process mails coming from my system, because of the lack of a rDNS or PTR record. Context: I tried to setup PTR records in the ...
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0answers
33 views

Apache error: Provided via SNI, but no hostname provided in HTTP request

I am pretty new to Servers and I got this message in my Apache error log: [Wed Jan 09 13:09:50.484812 2019] [ssl:error] [pid 7533] AH02031: Hostname \xad\xf95\xc4\xbb\x01 provided via SNI, but no ...
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1answer
40 views

Delete DHCP lease if DNS record is updated

Situation(Windows Environment): Three DHCP scopes with 3 different subnets. A user uses his notebook in all three subnets in one or two day's. Now, there are 3 dhcp leases at the same moment. The ...
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0answers
29 views

Bind DNS slave fails to function when master is offline

We have a couple of servers handling DHCP and DNS on our public wifi; they're operating in a redundant fashion with bind and isc-dhcp-server. I can nslookup query both units when both of the units ...
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0answers
65 views

Intermittent Ping/DNS timeouts

Can anyone suggest anything which might cause a server to fail to ping a switch and simultaneously fail to resolve DNS requests at regular intervals without affecting other network traffic to that ...
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1answer
32 views

BIND DNS rate-limit: qps-scale understanding

I have a few questions concerning qps-scale and how it is used when rate-limit option is used in BIND. Referencing: http://www.zytrax.com/books/dns/ch7/hkpng.html#rate-limit and https://ftp.isc.org/...
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1answer
21 views

DNS server with bind in Debian 9

I have a project to do for college. The project is a DNS server with client. I created the DNS server but when i want to see how it works i use the command dig myservername. 1. How can i proceed to ...
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1answer
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Does changing the name server use a different DNS zone?

Currently my domain provider is different than my hosting provider. I see I can change the nameservers on my domain provider dashboard and also I can change the "DNS Records". My hosting on the other ...
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0answers
24 views

Push DNS server instead of Router's IP on OpenWRT

I have a router with OpenWRT installed. In the section Network → Interfaces → WAN → Edit → Advanced Settings I have set up my custom DNS servers (Cloudflare and Google). Now my routers continues to ...
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1answer
31 views

Why does the hosts file on my win 08 server only ressolves DNS queries for internal DNS names and not external?

I added the following to my hosts file: [Server IP] abc.local [Server IP] abc.local Only works when I query internally. externally I can the IP but the mapped name does reply when I ping.
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1answer
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Using multiple A-records within one SPF a:name

Let's say my SPF record looks like this: v=spf1 a:spf.example.com -all And the records for spf.example.com look like this: spf.example.com A 12.12.12.12 spf.example.com A 12.42.66.12 spf.example....
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1answer
42 views

Is it possible DNS packet contains more than one SOA resource record

I've read RFC 1034 and RFC 1035 to learn about DNS protocol standards. I'm searching to find a limit occurring of SOA resource records. I'm aware that A, AAAA, CNAME, NS, MX, TXT RRs have no limit. ...
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2answers
61 views

Ubuntu: understanding iptables rules to allow domain name lookup

I'm currently setting up iptables rules on my web server (Ubuntu 18.04). Almost everything works as I expect it to work, but for the rules applied to DN lookup queries. Here is my understanding: DN ...
3
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1answer
38 views

AWS Route53 & Lambda: Redirecting Naked HTTP requests to HTTPS WWW for a serverless application

Problem I have a site running on a 'serverless' AWS Lambda function. Route53 routes requests to the API Gateway which connects to the Lambda function. The problem with this is that you can't setup ...
2
votes
1answer
90 views

Why does my DNS MX query return an SOA record?

I am using PowerShell to get an array of MX records. I am wondering why the following command would return SOA records as I have specified MX for the type parameter. Resolve-DnsName $SomeDomainName -...
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1answer
22 views

How to fix DNSMismatch?

I tried to crawl a project of mine with scrapy and received a warning which worries me. The config seems to be wrong, but everything works as expected. What is the reason for DNSMismatch and how can I ...
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0answers
35 views

Configure networking to select best route for VPN hosts

I have an OpenVPN server and some clients that connect to it, for example: host1 (at location1) host2 (at location2) laptop (my travel machine) Is it possible to configure routing in such a way that ...
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votes
1answer
22 views

Multiple domains to single document root

I am currently working on a distributed CMS that is built on a traditional LAMP stack. Customers can access their backend (and front end) using a subdomain of their username, for example: benm.mycms....
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1answer
33 views

Change DNS records and point to my AWS instance

I'm taking over a project and I cannot access the original Amazon AWS account, which has a route53 configuration of DNS nameservers and A records configurations. I'm fairly new to networking but I was ...
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0answers
50 views

Why would a PTR record be ignored?

Why would a single domain controller ignore a valid PTR record which has successfully synced to it in an AD Integrated reverse lookup zone? I am running: nslookup <hostIP> <dnsserver> ...
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0answers
37 views

MTA poor reputation [duplicate]

I'm facing MTA poor reputation and I'm fighting against it since days without success. MTA poor reputation had plenty topics so I verify/modify many aspect of my configuration such as: Verify ...
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0answers
42 views

PFSense - How do I configure Dynamic DNS to register reverse DNS records in BIND

I've got a PFSense firewall and a Linux box running BIND. I've got the DHCP server configured to register hosts with the BIND server using the Dynamic DNS options on the DHCP server screen. As far ...
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1answer
24 views

Less restrictive CAA record for subdomain

I have a root domain I have control of and a set of subdomains, but other people are responsible for them. I want to add a CAA protection to my root domain, but I don't want to restrict the subdomain ...
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1answer
28 views

Resolve specific domain to localhost on Ubuntu and OpenVPN

I have a PC connected to my ubuntu OpenVPN server. what I'm trying to do is making google.com resolve to my IP address instead of Google IP address when I browser google.com on my client pc. ...
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3answers
94 views

Is an MX-record required on a domain to send emails only?

Imagine the following scenario: There is a online-shop that sends emails with noreply@shop.mydomain.com There are no MX-records for shop.mydomain.com as no mail to this domain is wanted There is a ...
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1answer
34 views

Authenticating DNS Queries

Is there any way to use a TSIG (or other) key in combination with a DNS query to authenticate into a DNS view for use with recursion? Something like: key trusted-key { algorithm HMAC-SHA256; ...