Skip to content
Sudonix

how to prevent DDoS attacks ?

Solved Vulnerability

Did this solution help you?
Did you find the suggested solution useful? Why not buy me a coffee? It's a nice gesture, and a great way to show your appreciation 💗

Related Topics
  • crazycellsundefined

    CSS codes to prevent votes to disappear

    Solved Customisation
    3
    1 Votes
    3 Posts
    280 Views
    crazycellsundefined

    @phenomlab yes, it is 🙂 thanks a lot…

  • DownPWundefined

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

    Security
    4
    0 Votes
    4 Posts
    691 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
    2
    1 Votes
    2 Posts
    292 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.

  • Pandaundefined

    Why CSS acts different in Desktop?

    Bugs
    11
    4 Votes
    11 Posts
    594 Views
    phenomlabundefined

    @DownPW I’d have to agree with that.

  • dave1904undefined

    Collapsing blockquotes on Harmony

    General
    2
    2 Votes
    2 Posts
    180 Views
    phenomlabundefined

    @dave1904 that’s a really good point actually. I know it was there previously on Persona, but you’re right - no such function exists on harmony.

    However, putting something in place to mimick the behaviour of Persona won’t be hard from the js standpoint, although I wonder if perhaps we should ask the NodeBB developers is this feature was overlooked?

  • cagatayundefined

    Forum Icons NodeBB

    Solved Customisation
    13
    0 Votes
    13 Posts
    1k Views
    phenomlabundefined

    @cagatay That matches what I see

    4f0f858d-9812-42b1-9f61-ffb13d31dccd-image.png

  • crazycellsundefined

    Adjusting the size of boxes in posts-list class

    Solved Customisation
    3
    3 Votes
    3 Posts
    300 Views
    crazycellsundefined

    @phenomlab thanks a lot, this combination works best 👍

    .posts-list .posts-list-item .content { overflow: auto; max-height: 600px; }
  • DownPWundefined

    [NodeBB] Import custom Font

    Solved Customisation
    12
    3 Votes
    12 Posts
    1k Views
    phenomlabundefined

    @cagatay you’ll need to define this in the body tag (or another element if you want greater or more granular targets) - for example

    body { font-family: "Poppins"; font-size: 16px; }

    Essentially, you use the font-size CSS directive.