Q. How do I find out if I Linux box is under DoS attack or not form a shell prompt?
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ip address
Q. I run quite large network with different subnets. I’d like to know how can I find out duplicate IP address under Linux / UNIX? A. You can use arpping command. The arping utility performs an action similar to ping command, but at the Ethernet layer. You can send ARP REQUEST to a neighbor host [...]
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Q. How do I configure lighttpd web server as virtual host for serving multiple web site from a single public IP address (name-based virtual hosting)? A. Virtual hosting is a method that servers such as webservers use to host more than one domain name on the same server, sometimes on the same IP address. There [...]
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Q. How do I block ip address of spammers with iptables based firewall under CentOS Linux 5? A. You can simply block IP address of spammers by editing /etc/sysconfig/iptables file under: a) CentOS Linux b) Fedora Linux c) RHEL 4.x/5.x etc Open file /etc/sysconfig/iptables: # vi /etc/sysconfig/iptables Append ip address of spammers as follows: -A [...]
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I‘ve recently installed Debian Linux 4.0 on my server and Ubuntu Linux 7.04 on Laptop. I would love to have a multiple IP address that I can use for verity of purposes. I would like to bind 4 IP’s to the ‘eth0′ device or NIC. How do I achieve this?
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Q. How do I test or check reverse DNS for given IP address under Linux or Windows XP/Server 2003? A. Reverse DNS lookup (also known as rDNS) is a process to determine the hostname associated with a given IP address. Typically, the DNS is used to determine what IP address is associated with a given [...]
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