How can I look up IP addresses under UNIX or Linux operating systems using command line options?
[continue reading…]

I‘ve main domain configured at http://example.com and I’d like to use http://support.example.com with different files. How do I add subdomain support with Lighttpd web server under UNIX or Linux operating systems?
[continue reading…]

How do I find or check IP’s that are currently banned using iptables command in Linux? How do I verify that IP address 1.2.3.4 is banned or not in Linux?
[continue reading…]

How do I send gratuitous ARPs under Linux? How do I tell my DUMMY router that the IP is over here now, under Linux operating systems?
[continue reading…]

How do I block particular IP addresses or host with the iptables command under Linux?
[continue reading…]

How do I use nslookup command line administrative tool for testing and troubleshooting DNS servers including reverse lookup under UNIX or Windows operating systems? How do I look up an IP address of a domain or host on a network using nslookup command?
[continue reading…]