History of DNS server

How DNS server evolved?

To understand why we require DNS server we have to go back to initial stages of networking the computers around late 1960’s and early 1970’s where it all started in Universities(especially Barkley University). Initially there is single computer for university due to cost and other factors, then to multiple systems per university. When computers started increasing exponentially in universities at this time people are forced to … Continue Reading

We are very much happy to announce that we started posting on DNS client and Server stuff on our blog for this month(Jan 2011). We already have some minor existing stuff related to DNS and troubleshooting it. Below are quick links to our existing DNS Server/Client stuff

http://www.linuxnix.com/tag/dns-servers

http://www.linuxnix.com/tag/dns

Some of the DNS topics which are going to cover in this month are as follows. Please feel free to add requirements for DNS concepts which are not … Continue Reading

This is a small post on how to install sendmail in Linux

Sendmail is a mail server package which most popular mail server(but not a secure and easy to configure server).

Installing sendmail package.

#yum install sendmail

#yum install m4

Note:See our other how to on configure local YUM server.

m4 package is to compile the sendmail.cf and sendmail.mc after you have done changes to sendmail.mc. And m4 package is to compile access file … Continue Reading

This is a small how to check if a service is running in the server or not.

Some times we need to check the status of a service if its running or not to cross verify some thing on server.. Suppose you have edited your httpd.conf file and when restarting the service it just show start service is on. But when you try to get access to the web site the site is down. At … Continue Reading

When you are configuring Apache-Aactive directory integration you may find this error. This is bit strange error, this type of errors will come when the LDAP URL is not mention properly. There may be a special character in the line which you coped from some file/doc/blog causing this issue.

If you see below lines both look same

AuthLDAPURL “ldap://server.example.com:3268/dc=example,dc=com?sAMAccountName?sub?(objectClass=*)”
AuthLDAPURL "ldap://server.example.com:3268/dc=example,dc=com?sAMAccountName?sub?(objectClass=*)"

But there is a hidden new line in first AuthLDAPURL line. so be careful … Continue Reading

Recently we got a requirement to configure a Sub-domain(sub-zone) record in DNS server.  Its little bit advanced concept but very much easy to configure. The most known records are as follows.

A record for Adding an IP address record

NS record for a Name Server record

PTR record for a pointer record( i.e. Reverse IP lookup record)

CNAME record for a Canonical name record(i.e. alias to a A record)

MX record for a Mail Exchange … Continue Reading