We can always set time to the commands showed in history command. Why we require to set time for this?
This is totally a security measure and used for troubleshooting/fingerprinting a security threat.
history command sample output before setting this variable.
466 df -h 467 df 468 exit 469 nfsstat 470 find / -iname *.ppt 471 ftp2 472 man ping 473 ping -R google.com
So how to set that?
Use inbuilt variable HISTTIMEFORMAT to set … Continue Reading
Its good to harden your box which is in DMZ.
What is DMZ?
Ans : DMZ is a De Militarised Zone where we will be keeping our servers, so that they can be access by out side people. Let me explain more about this DMZ. Who are not familiarise(And this activity is most of the time a Network admin work).
1. DMZ is a place where we will be isolate machines from companies local LAN.… Continue Reading
I used to astonish all the time when I see the FTP package name. vsftpd which abbreviated to Very Secure File Transfer Demon(vsftpd). But when we see the security prospective of this package there is no much security included with this package. I mean when you login to server the credentials are transferred in plain text. This is the reason by default root user is not allowed to login to ftp server.
To … Continue Reading
IPtables (Netfilter) :
IPtables is the default firewall for Linux. Its a vast subject which can not be covered in one post. I will try to give as much info as possible at the same time not to make it complex. Lets start with basics.
What is a firewall?
Ans : A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications –Wikipedia.org… Continue Reading
Chittaranjan: It will be better if you'll put about Linux Cluster and Storage, coz now-a-days ...
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