How to stop NetworkManager service to modify resolv.conf file ?
Today we will see one of the most common issue that after rebooting system our resolv.conf file is getting updated everytime and our DNS client configuration is removed. Let us...
Tag: dns
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How to install dnsperf on RHEL 6/Centos 6 and use this to test DNS server ?
In this article, we will see how to install dnsperf tool on RHEL/CentOS 6. And how to use it to test DNS server performance. 1. Download the RPM package. [root@ngelinux001...
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Installing dnsperf tool on RHEL or CentOS 7.
Today in this post, we will see how to install dnsperf on RHEL or CentOS 7. The easy and quick way is to do via snapd. Lets see the steps...
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How to check for open port in Linux on multiple servers together ?
Suppose you have a list of servers, and you want to check for a particular port on which server its open. So if you telnet each server on that port...
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Not able to ping a server from an IBM AIX server – Know how to clear DNS cache.
In this post, we will see how to clear DNS cache on an IBM AIX server. It is useful when sometimes we have any outage with any DNS server, or...
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Solved: DNS Issue: How to deal with RFC 1918 response from Internet for X.X.XX.XXX.in-addr.arpa warning messages ?
Today we will look at an interesting warning messages on our DNS server and found the requests are coming from some random source say, XXX.XX.X.XX. 1. Issue Details named-security.log:11-Apr-2020 07:41:26.657...