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Why is CentOS 7 unable to resolve nslookup for short?
I tried setting up a DNS Lookup on CentOS 7 (in a Virtual Box VM), which works for FQDN on the same virtual machine as the DNS. However when I try to resolve the short hostname, it fails. I have seen this working on some servers and wanted to learn how to set it up myself.
What happens when you try a DNS name lookup?
When you try a DNS name lookup, the resolver libraries, if unsuccessful, try in turns to resolve the name adding the domains in the search directive until they find a resolvable name, or until they exhaust the domain list in the search directive. Thanks for contributing an answer to Unix & Linux Stack Exchange!
What to do if your DNS is not working?
(2) nslookup abc.i is looking up the domain name, not an individual machine. Since you’ve suppressed most of the zone files noone can check the syntax of the entry for the machine at 192.168.102.159 either forwards or reverse.
Do you need access control for a recursive DNS server?
– If you are building a RECURSIVE (caching) DNS server, you need to enable recursion. – If your recursive DNS server has a public IP address, you MUST enable access control to limit queries to your legitimate users. Failing to do so will cause your server to become part of large scale DNS amplification attacks.
Why is CentOS 7 unable to resolve any host names?
I’ve installed CentOS core, configured the IP, Mask, and GW for the network the servers are on, and verified IP connectivity is working. I was then able to install BIND and BIND-UTILS. After that everything has gone down hill. I can’t perform nslookups on anything from either server or from my internal test DNS server.
Where to point CentOS 7 / BIND 9 DNS servers?
My company is re-configuring our network DNS infrastructure to point our internal DNS servers at two new CentOS 7 / BIND 9 machines in our DMZ instead of reaching straight out to resolve unknown hosts. I’ve installed CentOS core, configured the IP, Mask, and GW for the network the servers are on, and verified IP connectivity is working.
What does it mean can’t resolve hostnames?
Re: Can’t resolve *any* hostnames. Sounds like you have either lost external connectivity (missing route?) or you’ve firewalled off either outbound or inbound UDP port 53 traffic. Can you ping 8.8.8.8?