I was setting up a new PBX for my client and I came to a rather unusual problem. The client was using SIP trunk from Slovak Telecom together with a fresh installation of FreePBX (Linux distro based on CentOS with bundled Asterisk and other candy).
Internet is a dangerous place. And more often also very controversial, just like the following article. Today I’m going to describe a little bit controversial way how to protect our network against malicious websites by changing replies to DNS requests to these sites.
Yesterday, I discovered one interesting thing. It’s kind a new for me, but nothing special. There is a useful tool for setting system tunables according to the specific use of machine in RHEL based Linux distros like CentOS etc.
If we are taking the networking seriously, we have to monitor its status and health of its services. In small networks with number of devices in tens is the whole issue quite simple and the default configuration is sufficient. But what if the network has “grown a little bit” to …
Today I tried to run cardserver on my favourite piece of hardware – ALIX 2d2. I used serial Phoenix reader and up-to-date OScam. I struggled a lot of time trying to force reader to communicate via serial interface, because using USB-Serial converted it worked like a charm.
IMQ and ESFQ are very interesting and very important parts of kernel if you take traffic shaping on Linux seriously. Unfortunately, you cannot find them in distribution packages, therefore you need to get them in through patching the kernel. It’s not that hard or time-demanding, but recently I reinstalled one …
Recently, after RAM module change in one of our Dell servers, I needed to clear ECC error counter to disable alerts which were raising in monitoring consoles. Well, it’s not so easy as it seems to be.
Pre tých, ktorí netušia, o čom je reč – ALIX je zariadenie od firmy PC Engines, pokračovateľ niekdajšieho produktu WRAP. Na tejto doske s rozmermi 6×6″ nájdete procesor AMD Geode LX800, ktorému sekunduje 256MB RAM. Doska, mojom prípade model 2d2 má k dispozícii slot na CF kartu, 2x miniPCI slot, …
Tento skriptík používam už dosť dlho v rôznych podobách na jednoduché zálohovanie MySQL databázy/databáz do určeného adresára vo forme /server/rok/mesiac/deň/databáza/tabuľka.sql.
Tak ako Mozilla Firefox, aj Google Chrome si ukladá určité dáta do SQLite databázy. Pri dlhodobejšom používaní však môžu tieto súbory príliš nabrať na veľkosti, čo spomaľuje štart aj samotnú prácu. Je to dané spôsobom, ako SQLIte engine narába so zmazanými záznamami. Tie nevymaže úplne, iba ich označí za zmazané. …