In our network we have deployed dozens of EdgeCore ES3528M/ES3552M switches. However, after frequent upgrades and configuration changes, often happens that old config files, opcodes, boot-roms will remain int the flash memory and are no longer needed. Fortunately, since opcode version 1.4.4.0 there is command available which deletes all inactive …
Some RouterBOARD devices (those with “P” in the model name) have the ability to power devices through Power-over-Ethernet (PoE for short). It is a very useful thing, especially after the PoE firmware upgrade to the latest version (currently 2.1), which increases the current limit for the device and port, adds …
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.
DHCP alerting is a feature of RouterOS, which can alert us on rogue DHCP server on the network. The working principle is easy. Router sends DHCPDISCOVER packet on interface and if there’s reply by router not in whitelist, the incident is logged. This script may become handy during mass deployment …
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 …
Ako som v predchádzajúcom článku sľúbil, dnes sa pozrieme na to, ako sledovať hladinu napätia v monitorovacom systéme Nagios. Získame tým o niečo profesionálnejší pohľad na našu sieť s notifikáciami o danej službe, takže už nikdy nebudeme zaskočení výpadkom služby. Návod sa dá generalizovať na akúkoľvek hodnotu prístupnú cez SNMP …
Keď som asi pred pol rokom objavil slovenský projekt superfaktura.sk, bol som nadšený. Vystavovanie faktúr sa zrazu stalo radosťou, evidovanie platieb a naháňanie neplatičov sa skrátilo na pár minút týždenne a vždy som mal prehľad o tom, ako si stojím s financiami. Jedinou nevýhodou bola neexistencia API pre spojenie Superfaktúry …