name server

How to check your dns with nslookup command

Nslookup command is used to test the Dns , Queries a name server for a host or domain lookup.NSLOOKUP was originally written on a Unix system, and so is easily run on most Linux variants by simply typing “nslookup” on the command line. On Windows systems you need to search your computer for the program [...]

How to Configure Cisco Router as Caching/Forwarding DNS Server

A Cisco Router running Cisco IOS can function as a Caching or Forwarding DNS Server which answers to DNS queries from clients either from its host table or cache or forward it to a DNS server which can respond to the query. This feature can come in handy in small network environments where the router [...]

How to to configure BIND9 in Ubuntu

There a many ways to configure BIND9. Some of the most common configurations are a caching nameserver, primary master, and a as a secondary master. When configured as a caching nameserver BIND9 will find the answer to name queries and remember the answer when the domain is queried again. As a primary master server BIND9 [...]

How to Install and Configure Caching DNS on Fedora

BIND DNS are nameservers responsible basically for resolving domain names or hostnames into their equivalent IP addresses. Websites or domain names have their own equivalent IP addresses that are usually managed and provided by the same website firms. If somebody is browsing a website from his browser, this website is being resolved, looked up and [...]

Howto Create a DNSBL to Black Lists well known sources of SPAM

Black Lists are used in the context of email to define the IP addresses or netblocks of well known sources of SPAM. DNSBL defines a method of using standard DNS zone files to store such IP addresses. Standard DNS A RR queries are used to interrogate the black list which is organised as a reverse [...]