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[Question] Preventing DDoS (lemmy.ml)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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I self host all of my services but utilize a VPS as a gateway for access. Primarily to allow access to a media server and file storage for friends and family.

Recently I’ve been shut down by my VPS provider on multiple occasions because they claim my server was DDoS’d at 2gigabits/s. I don’t see any evidence of this in my logs.

Regardless, I set up Traefik proxy to geoblock any IPs outside of my country. Literally a few mins after doing so and confirming via VPN that it was working I got shut down and received an email that my network was severed temporarily due to a DDoS Blackhole event.

The questionable nature of their detection system aside, it’s got me wondering…does ip blocking actually help mitigate DDoS attacks?

The server still needs to process the incoming connection before it filters it, so I’m assuming the attack is still accomplishing it’s intent which is to overload the server. Can somebody more knowledgeable provide some insight?

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[–] [email protected] 6 points 1 year ago (1 children)

Setup cloudflare, I believe the free tier includes ddos protection. Then setup your ingress to only allow cloudflare IPs, either with iptables or even better if your vps supports it with a network policy.

[–] [email protected] 3 points 1 year ago (3 children)

I appreciate the tip but as a privacy minded self-hoster I try to avoid companies like cloudflare. Surely there has to be a way to diy DDoS protection?

[–] [email protected] 2 points 1 year ago

A 2 gigabit event isn't big enough to be considered a real attack, a service like cloudflare can sink a 2 terrabit attack every day of the week.

Building a DDoS protection service ( that isn't just black holing traffic ) starts with having enough bandwidth to throw away the attack volume plus keep your desired traffic working and have a bit of overhead to work your mitigation strategies.

What this means is to DIY a useful service you start by buying a couple of terrabits of bandwith in 'small' chunks of a hundred gigabits or so in most peering locations around the globe and then you build a proxy layer like cloudflare on top of it with a team of smart dudes to automate outsmarting the bad guys.

I don't like cloudflare either, but the barriers to entry in this industry are epic.

[–] [email protected] 1 points 1 year ago (1 children)

@brownmustardminion pfsense + incoming geo IP control (allow only from certain regions)

[–] [email protected] 1 points 1 year ago (1 children)

I imagine that’s essentially what I’ve accomplished with Traefik already. The question I have is if Geoblocking does much to mitigate a DDoS. I know for sure it’s at least useful to block third world scammers and bots from running hacking scripts against my server.

[–] [email protected] 2 points 1 year ago

@brownmustardminion DDoS usually involves attacks from multiple geographical locations simultaneously. You will eliminate a large threat surface by restricting which countries are allowed for incoming. Of course this won't prevent targeted attacks from hackers who know you and want revenge and can setup bots in a single location but these are rare. Most attempts are by script kiddies.

[–] [email protected] 1 points 1 year ago

Can you go IPv6 only with dynamic dns + recycling ip every day? My raspberry pi doesn't get bot traffic. I have 22, 80, 443 and a few other ports open on public ipv6 address.