Linux and Unix cheatsheet
Linux Netfilter tweaks for High traffic servers
If you are serving a high traffic web/DNS server, and recently having PING loss to the server and not all HTTP request were successful to i...
TIME_WAIT in netstat
So, ever wonder what all those TIME_WAITs are doing in your netstat listing? Okay, for those of you who don't spend all your waking hou...
Hardening the TCP/IP stack to SYN attacks
How to detect a SYN attack It is very simple to detect SYN attacks. The netstat command shows us how many connections are currently in the h...
Chroot SFTP via SSH
Edit sshd_config with options below to match with username. Restart to take effect.
Match User userA
ChrootDirectory /home/userA
ForceCommand internal-sftp
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