Skip to content
Sudonix

how to prevent DDoS attacks ?

Solved Vulnerability
34 2 10.2k 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
  • Sampo2910undefined

    External Links - New Window

    Solved Customisation nodebb links settings
    8
    2 Votes
    8 Posts
    1k Views
    phenomlabundefined
    @Sampo2910 search the forum here for ogproxy which is the client side version of that plugin I wrote. It’s in use here on this forum.
  • Madchatthewundefined

    TNG + Nodebb

    General tng genealogy nodebb plugin
    4
    0 Votes
    4 Posts
    1k Views
    phenomlabundefined
    @Madchatthew said in TNG + Nodebb: you have to try and use duck tape and super glue to change something to make it do what you want it to do I couldn’t have put that better myself.
  • JACundefined

    NodeBB recent cards customisation

    Solved Customisation nodebb recent cards
    3
    1
    2 Votes
    3 Posts
    995 Views
    JACundefined
    @phenomlab thank you very much for the assistance Mark, massively appreciated as always. The great thing about this is it’s all documented for other NodeBB users that come looking for solutions . Looks far better .
  • Norradundefined

    What plugins are being used here on Sudonix?

    Solved General nodebb plugins development
    6
    5 Votes
    6 Posts
    2k Views
    phenomlabundefined
    @Roki-Antic Welcome! This site isn’t running Persona, but Harmony - a very heavily customised version at that. Do you have a URL where your site is currently located that is publicly accessible? Feel free to PM this info if you do not want to disclose here. Happy to help with any customisation needs.
  • 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

    Nodebb design

    Solved General nodebb
    2
    1 Votes
    2 Posts
    1k Views
    phenomlabundefined
    @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.
  • crazycellsundefined

    CSS codes for fa-info icon

    Solved Customisation nodebb
    9
    1
    6 Votes
    9 Posts
    2k Views
    crazycellsundefined
    I have just figured it out… it can be targeted with text-decoration-color: I was mistakenly using color
  • kurulumuNetundefined

    nodebb dropdown menu

    Solved Configure nodebb
    5
    1
    0 Votes
    5 Posts
    2k Views
    JACundefined
    @phenomlab said in nodebb dropdown menu: @kurulumu-net You set it like the below example taken from this site [image: 1637939951821-aae36790-3257-4bb2-ad5a-0d744309876a-image.png] Which presents this [image: 1637939983445-77f47260-2941-4afe-9614-8e17dcfc8c19-image.png] Very interesting… I actually thought this wasn’t possible, as I remember it being asked in the NodeBB forum. Is this something new that’s been implemented? I’ll 100% be doing that when I’m on the laptop over the weekend.