Linux and Unix cheatsheet
PMTU (Path MTU) Discovery
Summary Internet computers, mostly servers, sometimes send packets too large for part of a given path. Not handling this correctly can m...
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...
AIX CPU Info
There are number of commands to show what are the current number of processors and their information. 1. show processor multithreading cap...
reading dpkg -l output; what is ii what is rc ?
-> desired package state ("selection state"):
u ... unknown
i ... install
r ... remove/deinstall
p ... purge (remove including config files)
h ... hold
-> current package state:
n ... not-installed
i ... installed
c ... config-files (only the config files are installed)
u ... unpacked
f ... half-configured (configuration failed for some reason)
h ... half-installed (installation failed for some reason)
w ... triggers-awaited (package is waiting for a trigger from another package)
t ... triggers-pending (package has been triggered)
-> error state (you normally shouldn't see a thrid letter):
r ... reinst-required (package broken, reinstallation required)
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