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how to prevent DDoS attacks ?

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19 Nov 2023, 23:07

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  • DownPWundefined

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

    Security
    34 2 Aug 2023, 13:41
    2 Aug 2023, 13:41
    0 Votes
    4 Posts
    804 Views
    undefined
    @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

    www. Infront stops website access?

    Solved Configure
    34 26 Jul 2023, 14:43
    26 Jul 2023, 14:43
    1 Votes
    10 Posts
    592 Views
    undefined
    @Panda because there is no match for the DNS entry specified. The receiving web server parses the headers looking for a destination hostname to match, and anything the web server is unable to resolve will be sent back to the root.
  • Pandaundefined

    Nodebb design

    Solved General
    34 11 Jul 2023, 10:13
    11 Jul 2023, 10:13
    1 Votes
    2 Posts
    361 Views
    undefined
    @Panda said in Nodebb design: One negative is not being so good for SEO as more Server side rendered forums, if web crawlers dont run the JS to read the forum. From recollection, Google and Bing have the capability to read and process JS, although it’s not in the same manner as a physical person will consume content on a page. It will be seen as plain text, but will be indexed. However, it’s important to note that Yandex and Baidu will not render JS, although seeing as Google has a 90% share of the content available on the web in terms of indexing, this isn’t something you’ll likely lose sleep over. @Panda said in Nodebb design: The “write api” is preferred for server-to-server interactions. This is mostly based around overall security - you won’t typically want a client machine changing database elements or altering data. This is why you have “client-side” which could be DOM manipulation etc, and “server-side” which performs more complex operations as it can communicate directly with the database whereas the client cannot (and if it can, then you have a serious security flaw). Reading from the API is perfectly acceptable on the client-side, but not being able to write. A paradigm here would be something like SNMP. This protocol exists as a UDP (UDP is very efficient, as it is “fire and forget” and does not wait for a response like TCP does) based service which reads performance data from a remote source, thus enabling an application to parse that data for use in a monitoring application. In all cases, SNMP access should be “RO” (Read Only) and not RW (Read Write). It is completely feasible to assume complete control over a firewall for example by having RW access to SNMP and then exposing it to the entire internet with a weak passphrase. You wouldn’t do it (at least, I hope you wouldn’t) and the same ethic applies to server-side rendering and the execution of commands.
  • Pandaundefined

    Can you adjust Admin settings on your NodeBB?

    Bugs
    34 10 Jun 2023, 20:30
    10 Jun 2023, 20:30
    0 Votes
    5 Posts
    486 Views
    undefined
    @Panda as, yes, now I understand and that makes 100% sense. It means those who get down voted can still have an opinion and use common services. And yes, you’re right. Rather than down vote, just ignore if you don’t agree.
  • cagatayundefined

    Upgrade Problem from 2.8.3 to 2.8.4

    Solved Configure
    34 26 Jan 2023, 21:25
    26 Jan 2023, 21:25
    1
    8 Votes
    35 Posts
    2k Views
    undefined
    @cagatay No, you can ignore that.
  • Pandaundefined

    Rotating homepage icons, gifs?

    Solved Configure
    34 17 Oct 2022, 15:25
    17 Oct 2022, 15:25
    3 Votes
    2 Posts
    284 Views
    undefined
    @eveh It’s not a GIF, no. It’s actually a webp file so made much smaller, and uses keyframes to control the rotation on hover. You can easily make your own though The CSS for that is as below @keyframes rotate180 { from { transform: rotate(0deg); } to { transform: rotate(180deg); } } @keyframes rotate0 { from { transform: rotate(180deg); } to { transform: rotate(0deg); } } Your milage may vary on the CSS below, as it’s custom for Sudonix, but this is the class that is used to control the rotate .header .forum-logo, img.forum-logo.head { max-height: 50px; width: auto; height: 30px; margin-top: 9px; max-width: 150px; min-width: 32px; display: inline-block; animation-name: rotate180, rotate0; animation-duration: 1000ms; animation-delay: 0s, 1000ms; animation-iteration-count: 1; animation-timing-function: linear; transition: transform 1000ms ease-in-out; }
  • undefined

    is "night mode" shifting the forum several pixels up?

    Solved Configure
    34 4 Mar 2022, 20:16
    4 Mar 2022, 20:16
    4 Votes
    8 Posts
    734 Views
    undefined
    @crazycells hmm. Good point. I actually use my own version of the dark mode plugin, so not entirely sure. However, I think the CSS is probably the same. I’m not at my PC currently but can check and advise later.
  • undefined

    background color of the footer area

    Solved Customisation
    34 1 Mar 2022, 00:11
    1 Mar 2022, 00:11
    1
    7 Votes
    7 Posts
    609 Views
    undefined
    @phenomlab thank you very much