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How To Look Up DNS on a Linux and Unix Systems

How do I look up for DNS (Domain Name System) information on a Linux or Unix-like systems using command line options?
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How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?
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My router configured by ISP tech and it is set to get DNS server address automatically from upstream. Is there is a way to find out the IP address of the dns server used by my router which is located at 192.168.1.1? Is there Linux, Unix, Apple OS X, or MS-Windows command that I can use get the same information?
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I'm getting slow DNS response from ssh and other network related traffic with delay of 30-60+ seconds per connection. All of our servers are behind hardware based dedicated firewall. My RHEL v6.1 server system running on HP hardware. How do I fix this problem?
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Linux Static IP Address Configuration

How do I configure the Internet Protocol version 4 (IPv4) properties of a network connection with a static IP address for servers running Linux operating systems? How do I configure static IP address under Debian Linux or Redhat / RHEL / Fedora / Redhat Enterprise Linux server?
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Linux Find Out My IP Number ( IP Address )

How do I find out ip number (IP Address) of my Linux server using command line options?
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OpenBSD: Static Routing Configuration

I know how to setup static routing under Linux and FreeBSD operating systems. But, how do you setup static routing under OpenBSD operating systems?
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