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how to prevent DDoS attacks ?

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  • 0 Votes
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    @DownPW 🙂 most of this really depends on your desired security model. In all cases with firewalls, less is always more, although it’s never as clear cut as that, and there are always bespoke ports you’ll need to open periodically.

    Heztner’s DDoS protection is superior, and I know they have invested a lot of time, effort, and money into making it extremely effective. However, if you consider that the largest ever DDoS attack hit Cloudflare at 71m rps (and they were able to deflect it), and each attack can last anywhere between 8-24 hours which really depends on how determined the attacker(s) is/are, you can never be fully prepared - nor can you trace it’s true origin.

    DDoS attacks by their nature (Distributed Denial of Service) are conducted by large numbers of devices whom have become part of a “bot army” - and in most cases, the owners of these devices are blissfully unaware that they have been attacked and are under command and control from a nefarious resource. Given that the attacks originate from multiple sources, this allows the real attacker to observe from a distance whilst concealing their own identity and origin in the process.

    If you consider the desired effect of DDoS, it is not an attempt to access ports that are typically closed, but to flood (and eventually overwhelm) the target (such as a website) with millions of requests per second in an attempt to force it offline. Victims of DDoS attacks are often financial services for example, with either extortion or financial gain being the primary objective - in other words, pay for the originator to stop the attack.

    It’s even possible to get DDoS as a service these days - with a credit card, a few clicks of a mouse and a target IP, you can have your own proxy campaign running in minutes which typically involves “booters” or “stressers” - see below for more

    https://heimdalsecurity.com/blog/ddos-as-a-service-attacks-what-are-they-and-how-do-they-work

    @DownPW said in Setting for high load and prevent DDoS (sysctl, iptables, crowdsec or other):

    in short if you have any advice to give to secure the best.

    It’s not just about DDos or firewalls. There are a number of vulnerabilities on all systems that if not patched, will expose that same system to exploit. One of my favourite online testers which does a lot more than most basic ones is below

    https://www.immuniweb.com/websec/

    I’d start with the findings reported here and use that to branch outwards.

  • Custom html in nodebb to prevent cache

    Unsolved Configure
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    2 Votes
    18 Posts
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    @Panda You’ll need to do that with js. With some quick CSS changes, it looks like this

    d619844f-fbfe-4cf1-a283-6b7364f6bf18-image.png

    The colour choice is still really hard on the eye, but at least you can now read the text

  • Composer Zen icon?

    Solved Configure
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    2 Votes
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    @DownPW exactly. Not really a new concept, and in all honesty, not something I’ve ever used.

    If you consider the need to add links and references, or citations, you’d need to be able to see other parts of the screen!

  • Want to use Sudonix themes ?

    Chitchat
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    32 Votes
    67 Posts
    2k Views

    @cagatay In your CSS, locate the block starting

    .category-card .text-muted.timeago

    And remove

    margin-left: -180px;
  • NodeBB: updating Admin details not working

    Solved Configure
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    3 Votes
    17 Posts
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    @mventures Ok. No issues

  • NodeBB: The global Search option

    Solved Configure
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    5 Posts
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    @mventures Yes, exactly. The other icon will restart NodeBB whilst the first icon I referenced will rebuild (recompile) it.

    The huge strength of NodeBB over Flarum (for example) is that the code is precompiled, and called once at boot. PHP’s code has to repeatedly reload code from source making it much slower.

  • NodeBB inline videoplayer

    Solved Customisation
    12
    3 Votes
    12 Posts
    878 Views

    @phenomlab
    YAY! It works
    Thanks so much

  • NodeBB templates

    Locked Chitchat
    12
    4 Votes
    12 Posts
    922 Views

    Placing this here for reference
    https://sudonix.com/topic/216/nodebb-js-script-css-theme-switcher

    Further information and posts can be found at this link