Questions tagged [dns-lookup]

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NAT-Reflection on Cisco ASA 5508-X

We have 2 internal networks in our environment. 10.1.x as a main network (with different vlans) and 192.168.1.x/24 as WiFi for our travelling users. Both are connected to our Cisco ASA 5508-X and then ...
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DNS client vs Nslookup - doing a manual test of the DNS client for SRV records

There are various references (such as DNS can't resolve hostname; nslookup can or https://web.archive.org/web/20160525082756/http://homepage.ntlworld.com/jonathan.deboynepollard/FGA/nslookup-flaws....
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SPF Too Many DNS Lookups issue

In our scenario, We're running into an issue with our SPF records in route53. We are receiving SPF Too Many DNS Lookups because we are using multiple mail services. Is there a way to resolve this? I ...
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-2 votes
2 answers
1k views

nslookup is showing different ip address for subdomains [closed]

I recently moved my web service to a new host. In the new host when my clients access www they get a message saying the SSL is not correct. Under my investigation, I found a problem with the name ...
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141 views

nginx proxy_pass only when rdns resolves correctly

I have a nginx server on PC_A running as a proxy for a website hosted on PC_B. The server on PC_A provides rate limiting, buffer and cache services for the website. I would like to enable DNS lookup ...
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nslookup result for google.com

I am quite new to the networking world! I was tweaking with some networking concepts and I found that we can use DNS for load-balancing by having multiple records in a DNS name server. So I ran a ...
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  • 113
2 votes
1 answer
240 views

How to identify the server providing a DNS response?

TL;DR: Where, in a nslookup www.somedomain.com -debug will I find the name/IP of the server(s) which reply to the chain of queries? Details: I have a setup (Windows 10 machine) which is connected ...
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8 votes
2 answers
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How do I figure out what's wrong with my DNS record?

My network admins have created a DNS record for thedigitalteacher.com which should include an A record for the domain root pointing to 5.10.124.142, which is indeed the response I get if I use our ...
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1 vote
2 answers
2k views

Different hostname to ip resolving results (nslookup)

Good day, everyone. Let's say I have a following setup: Windows 7 as host machine, DNS 192.168.0.100, 8.8.8.8, 8.8.4.4 Ubuntu 16.04 as guest machine on VirtualBox, DNS 192.168.0.100 (host?) ...
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17 votes
3 answers
46k views

Find out which DNS server answered your query

I have a seemingly simple question but couldn't find the answer to precisely that question after some search: I know that, if I want to look up the IP address of some domain name, I type, for example: ...
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Proxy error: DNS lookup failure for

The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /. Reason: DNS lookup failure for: www.******.com This is appearing sometimes ...
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22 votes
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Multi-query multiple DNS record types at once

I am currently experimenting a bit with the DNS protocol. I have noticed that I can query both, A- and MX-record of a domain, using two separate DNS packets, each containing one question query. ...
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-1 votes
1 answer
1k views

Ping can not find any subdomain at all

Following shows the information of my virtual environment. computer name = spFull computer name = sp.spd.localdomain = spd.localInside DNS there is a Forward lookup zone, its name is spd.local and ...
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7 votes
1 answer
19k views

Nslookup not using hosts file

So I've set public IP on the hosts file for a certain public IP address, but it picks up private ip from nowhere or from DNS. Content of windows hosts file C:\Windows\System32\drivers\etc\Hosts ...
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2 answers
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cname record to rhcloud.Com not working anymore

I have a website hosted at rhcloud.com. I added 2 years ago a cname on my domain name dp-global.vn to redirect to the website (gdp-robertduy.rhcloud.com). Today it is not working anymore and the ...
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1 answer
1k views

DNS lookup to whois.verisign-grs.com returns SERVFAIL

I'm having a problem trying to look up a certain DNS name on the internet. For some reason I keep facing a SERVFAIL thought the correct result is displayed - like the DNS name is being resolved twice (...
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-2 votes
1 answer
1k views

When to use resolv.conf? [closed]

I understand resolv.conf file is used by Linux to resolve DNS lookup but I cant figure if I need to edit this file in my case. My Scenario: I am not hosting the DNS on my vps machine. I have ...
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1 vote
2 answers
267 views

How to determine which server is the cause?

I have just registered a new domain with Malaysia NIC. The registration system is not fully automatic and I am afraid that someone could have botched something in the setting up. At the same time, ...
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0 votes
1 answer
323 views

Why does this name server resolve incorrectly?

Why does this ENom name server resolve incorrectly? Earthlink is related to my ISP. $ nslookup yahoo.com dns1.name-services.com Server: dns1.name-services.com Address: 98.124.192.1 Name: yahoo....
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3 votes
1 answer
7k views

dig succeeds, nslookup fails (with dnsmasq as the server)

I installed dnsmasq on a machine of mine (It's a Kubuntu 12.04 LTS), backed only by /etc/hosts (no connection to the Internet until later). Now, if I dig mymachine, I get 192.168.0.1, but if I try to ...
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how to change my domain to point Amazon AWS EC2 [duplicate]

I have a domain in 1and1.com , I have been using it with hostgator hosting. Now I want it to point to my amazon aws ec2 instance. Here are the steps i have followed. I logged into AWS and chose Rout ...
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2 votes
3 answers
13k views

Bypass DNS Server lookup by using /etc/hosts when using a dynamic IP address

It is my understanding that the need to query external DNS servers for commonly accessed names can be reduced if those commonly accessed names are present in /etc/hosts. Now, I have a situation ...
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1 vote
1 answer
186 views

Why do I sometimes (but not always) see "internet address" data for an MX record in output for nslookup queries?

CentOS 5.x I've noticed that sometimes I'll see "internet address" for an MX record in the output of nslookup. This doesn't happen all the time though. For example, let's say that foo.com uses ...
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Incorrect DNS Records

This is a bit perplexing to me. When I do a NSLOOKUP on 10.0.0.17 it comes back as "ProductionServer01.domain.com" which is a decommissioned server. 10.0.0.17 is actually ProductionServer02.domain....
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4 votes
2 answers
5k views

Why is nslookup and dig giving me a "Warning: ID mismatch ... got 0" error?

I'm trying to troubleshoot some persistent connectivity issues and I'm frequently getting the following error message when using dig or nslookup. bash$ nslookup > www.google.com ;; Warning: ID ...
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2 votes
1 answer
142 views

Do I have to own my domain before attempting to connect to my domain controller?

I am in the process of purchasing a domain, but I do not own it yet. I setup my domain controller as internal.domain.com. The problem I'm running into is in connecting my workstations to my domain. I'...
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2 votes
1 answer
9k views

Tool for Bulk DNS Lookup with Domain or IP Information [closed]

Suggest me a tool for DNS Lookup and it should have following features. Bulk DNS Lookup (Input .txt to Output .txt) Should have Forward and Reverse Lookup Should find Domain or IP information. Ex. ...
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  • 823
0 votes
1 answer
3k views

Getting a reverse lookup answer from nslookup but not from dig

So if I use dig to do a reverse lookup I get: $ dig 71.74.56.122 ; <<>> DiG 9.6.0-APPLE-P2 <<>> 71.74.56.122 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<-...
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