This is the blog of Ronald Bartels that wanders on and off the subject of problem management (that is how it started). Mostly now the topics are about IoT and SD-WAN.
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Fork-lifting legacy monitoring systems and migrating to the cloud
Within data centres and telecommunications points of presence, many
legacy monitoring solutions exist. The architecture is typically rack
mounted hardware that has wired sensors or probes. The hardware has a
built-in web server and in most cases also a text based cli. The
connectivity is typically via an internal Ethernet network and
optionally out of band connectivity via a GSM modem. The user is
required to connect out of band to the web server or cli on the
hardware. This connection entails an incoming session over the modem
that requires approval from the service provider. The service provider
usually discourages these type of connections due to hacking.
Additionally, the network address of the hardware needs to be associated
with a name resolution system and often this is a dynamic DNS type
service. This architecture is the basis for many types of botnet
attacks.
Firewalls are becoming increasingly important in today’s world. Hackers and automated scripts are constantly trying to invade your system and use it for Bitcoin mining, botnets or other things. To prevent these attacks, you can use a firewall on your system. IPTables is the strongest firewall in Linux because it can filter packets in the kernel before they reach the application. Using IPTables is not very easy for Linux beginners. We have created easywall - the simple IPTables web interface . The focus of the software is on easy installation and use. Access this neat software over on github: easywall
When building a DDoS mitigation service it’s incredibly tempting to think that the solution is scrubbing centers or scrubbing servers. I, too, thought that was a good idea in the beginning, but experience has shown that there are serious pitfalls to this approach. Read the post of at Cloudflare's blog: N o Scrubs: The Architecture That Made Unmetered Mitigation Possible
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