Network Monitoring

11 Basic Linux NMAP command Examples for System administrators

Learn nmap with examples NMAP(Network Mapping) is one of the important network monitoring tool. Which checks for what ports are opened on a machine. Some important to note about NMAP NMAP abbreviation is network mapper NMAP is used to scan ports on a machine, either local or remote machine (just you require IP/hostname to scan).(…)

How To Use IPtables to Block ICMP (Internet Control Message Protocol) Requests?

How to use IPtables to block ICMP (Internet Control Message Protocol) requests? Ans : To do this we have understand why we require this thing should be done. When Hackers try to hack in to any machine first thing they will do is a basic ping test. Code :#ping target-machine If this is succeed they(…)

SNORT(IDS/IPS) Configuration and Implemenation

Lets start how to install SNORT which is An Intrusion detection system (IDS) and an Intrusion Prevention System (IPS). We tested installation of SNORT on RHEL5. Step1 : Download following packageslibpcap-1.0.0.tar.gzpcre-8.00.tar.gzlibnet-1.0.2a.tar.gz (This is optional package if you want SMB popup alerts on window’s machines.)snort-2.8.5.1.tar.gzacid-0.9.6b23.tar.gz Note : Don’t try to install SNORT through rpm packages, try(…)

How To Log DNS Server Activity?

How to log DNS server activity? Ans : Sometimes you require to log DNS server activity to a file for future reference for analyse the activity on DNS server and whether DNS server is properly resolving accurately or not. rndc(remote name daemon control) is the command to use for DNS server activity logging. Let’s have(…)

Get BIOS, Firmware, Hardware And Drivers Details in Linux/Unix

How to get the BIOS (Basic Input Output System) information and other information in Linux/Unix such as 1.Hardware 2.CPU information 3.Drivers installed in Linux machine. For every operation/work in Linux there will be one command, this is true most of the time (all you need is to find that command). How to get BIOS info(…)

How To Use VNSTAT To Monitor Bandwidth Usage.

There are so many tools to monitor network such as MRTG, now I am going to explain such tool which monitors bandwidth for a system, ie vnstat(view network statistics). Its very much easy to install and configure. This tool can give you full details about how much bandwidth used on the basics of, Per month.(…)

Network monitoring/info gathering tools in linux

NETWORK MONITORING/ INFO GATHERING TOOLS IN LINUX.1.Why we have to monitor Network ?Some times we have to monitor Network traffic in our LAN if there is any traffic issues such as “Broadcast Stroms”. Here I am going to explain some Linux tools which are used to monitor network traffic. I used to struggle a lot(…)

N.A.G.I.O.S

N.A.G.I.O.S NAGIOS(N.A.G.I.O.S. is a recursive acronym: “Nagios Ain’t Gonna Insist On Sainthood“, “Sainthood” being a reference to the original name of the software, which was changed in response to a legal challenge by owners of a similar trademark). –wikipedia.org NAGIOS is a system and network monitoring application that watches host and services that we specify(…)

lsof Command explained

 Today I came across ISOF command in one interview, the interviewer of this interview is a tricky guy and a great Linux/nix guru. He asked me many questions which I can’t answer, in that lsof command is one. This command really impressed me and this is one of the most powerful command i ever come across till this point(…)