Skip to content
Sudonix

how to prevent DDoS attacks ?

Solved Vulnerability
34 2 7.3k 1
Log in to reply

Did this solution help you?
Did you find the suggested solution useful? Support 💗 Sudonix with a coffee ☕
If your organisation needs deeper expertise around infrastructure, security, or technology leadership, learn more about Phenomlab Ltd. Many of the deeper technical guides behind Sudonix are published there.

Related Topics
  • ahmedundefined

    nodebb error logs

    Bugs nodebb
    6
    2
    4 Votes
    6 Posts
    1k Views
    ahmedundefined
    I just wanted to ask because I don’t have much knowledge about the new installation. Thank you for the explanatory answer.
  • DownPWundefined

    Setting for high load and prevent DDoS (sysctl, iptables, crowdsec or other)

    Security security server kernel ddos iptables
    4
    0 Votes
    4 Posts
    2k Views
    phenomlabundefined
    @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.
  • Pandaundefined

    Composer options on nodebb

    Solved Configure nodebb
    8
    1
    3 Votes
    8 Posts
    1k Views
    phenomlabundefined
    @Panda You should be able to expose the CSS for these using F12 to get into console [image: 1686833368846-3591518c-e3a3-4ada-a43c-6b32a5e0359c-image.png] [image: 1686833399483-a2b8ed46-4157-4ff2-85f0-576543380107-image.png] That should then expose the element once selected [image: 1686833431032-89d9c545-a47a-40d1-98f4-80cf3b958e8f-image.png] Here’s the below CSS you need based on the screenshot provided. .composer .formatting-bar .formatting-group li[data-format="picture-o"], .composer .formatting-bar .formatting-group li[data-format="spoiler"] { display: none; }
  • Teemberlandundefined

    NodeBB Theme/Skin Switcher

    Solved Customisation nodebb
    38
    7 Votes
    38 Posts
    8k Views
    phenomlabundefined
    @Teemberland great spot ! You should create a PR for that so they can include it in the official repository. Just be aware that any subsequent releases will overwrite your fix without the PR.
  • cagatayundefined

    Top Ranked Forums

    Chitchat nodebb top ranked
    9
    1
    3 Votes
    9 Posts
    2k Views
    phenomlabundefined
    The real issue here is that most people consider forums to be “dead” in the sense that nobody uses them anymore, and social media groups have taken their place. Their once dominant stance in the 90’s and early 00’s will never be experienced again, but having said that, there are a number of forums that did in fact survive the social media onslaught, and still enjoy a large user base. Forums tend to be niche. One that immediately sticks out is Reddit - despite looking like it was designed in the 80s, it still has an enormous user base. Another is Stack Overflow, which needs no introduction. The key to any forum is the content it offers, and the more people whom contribute in terms of posting , the more popular and widely respected it becomes as a reliable source of information. Forums are still intensely popular with gamers, alongside those that offer tips on hacking etc.
  • crazycellsundefined

    Recent Cards plugin customization

    Solved Customisation nodebb
    21
    1
    13 Votes
    21 Posts
    7k Views
    phenomlabundefined
    @pobojmoks that’s easily done by modifying the code provided here so that it targets background rather than border In essence, the below should work $(document).ready(function() { $(window).on('action:ajaxify.end', function(data) { $('.recent-card-container').each(function(i) { var dataId = $(this).attr("data-cid"); var color = $('[role="presentation"]', this).css("background-color"); console.log("data-cid " + dataId + " is " + color); $('[data-cid="' + dataId + '"] .recent-card').attr("style", "background-color: " + color); }); }); });
  • pwsincdundefined

    [NodeBB] greeting message

    Solved Customisation css nodebb javascript
    2
    1
    3 Votes
    2 Posts
    1k Views
    phenomlabundefined
    @pwsincd welcome to sudonix, and thanks for the comments. What your looking for is here https://sudonix.com/topic/195/nodebb-welcome-message/3?_=1648295651358
  • JACundefined

    Social icon (Nodebb)

    Solved Customisation nodebb social
    7
    0 Votes
    7 Posts
    2k Views
    JACundefined
    @phenomlab said in Social icon (Nodebb): @jac I just tested my theory around using the OG image, and according to the Twitter card validator, it works fine [image: 1638880098289-73e805e1-997b-41bf-9259-51c5052ca8fc-image.png] fixed