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how to prevent DDoS attacks ?

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  • ahmedundefined

    nodebb error logs

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    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)

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    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.
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    @DownPW I’d have to agree with that.
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    @Panda said in Upgrade to NodeBB v3? 2BB or not 2BB, that is the question!: So although thats a plugin it has Widget like element and stopped working on the Theme change Which is normal based on the widgets being reset when you change themes.
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    @phenomlab Seems to be better with some scaling fix for redis on redis.conf. I haven’t seen the message yet since the changes I made # I increase it to the value of /proc/sys/net/core/somaxconn tcp-backlog 4096 # I'm uncommenting because it can slow down Redis. Uncommented by default !!!!!!!!!!!!!!!!!!! #save 900 1 #save 300 10 #save 60 10000 If you have other Redis optimizations. I take all your advice https://severalnines.com/blog/performance-tuning-redis/
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    @phenomlab yes it caused a problem for mobile users. thank you for helping …
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    is there any way to see whose reputation is changed by this plugin?
  • JACundefined

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    JACundefined
    @phenomlab said in NodeBB metadata: @jac Are you sure ? https://www.google.co.uk/search?q=site%3Astockportcounty.fans&sxsrf=AOaemvLwnaZL-PliU_2dBOg_Eo1pMVhBjg%3A1638982328139&source=hp&ei=uOKwYeatBcOsad3yp7AE&iflsig=ALs-wAMAAAAAYbDwyLBSDcG5XYoFCKwQFhgz94wTxOcV&ved=0ahUKEwjm6dX71NT0AhVDVhoKHV35CUYQ4dUDCAk&uact=5&oq=site%3Astockportcounty.fans&gs_lcp=Cgdnd3Mtd2l6EAM6BAgjECc6CwgAEIAEELEDEIMBOg4ILhCABBCxAxDHARCjAjoRCC4QgAQQsQMQgwEQxwEQowI6BQguEIAEOggIABCABBCxAzoFCAAQgAQ6CAguELEDEIMBOgsILhCABBDHARCvAToICC4QgAQQsQM6BQgAELEDOgsILhCABBDHARDRAzoLCAAQgAQQsQMQyQM6BQgAEJIDUABYySZg0CdoAHAAeACAAW2IAa0NkgEEMjMuMpgBAKABAQ&sclient=gws-wiz Fair enough 🤪🤪.