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...
How do I telnet/check UDP ports whether it is open or not?
How do I telnet/check UDP ports whether it is open or not?
Use nmap as below, port UDP 123 is the common ntp daemon port.
$ nmap -p 123 -sU -P0 192.168.0.0
$ nc -zu 192.168.0.0 123
You may to look for “nc”, “iperf” tools as well.
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