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Ddos on server


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ish12321
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Join Date: May 2016
Old 01-11-2018 , 08:20   Ddos on server
Reply With Quote #1

Hey there,
My server is facing heavy ddos attacks regularly. I managed to capture traffic with tcpdump. Please could someone analyse and get a solution please. IPTABLES rule maybe?
https://mega.nz/#!IcE1CCKR!pBVIbon-V...I47mnE5UdfdVoQ
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Old 01-11-2018 , 09:25   Re: Ddos on server
Reply With Quote #2

This must go to off topic sec.
Have you tried contacting the host provider? They MUST take this case over.
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ish12321
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Join Date: May 2016
Old 01-11-2018 , 09:47   Re: Ddos on server
Reply With Quote #3

Host takes toooooooo much extra money for ddos protection. And the imp thing is my bandwidth wasnt overloaded still everything was down...
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DjSoftero
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Old 01-11-2018 , 10:38   Re: Ddos on server
Reply With Quote #4

It means it`s time to switch the host providers.
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ish12321
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Old 01-11-2018 , 11:21   Re: Ddos on server
Reply With Quote #5

No ddos protected host here. Since the bandwidth wasnt flooded I think if correct iptables rules are put (for which I'm asking help) it could prevent the attack or atleast decrease
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edon1337
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Old 01-11-2018 , 11:43   Re: Ddos on server
Reply With Quote #6

Why not just try CloudFlare?
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ish12321
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Old 01-13-2018 , 10:35   Re: Ddos on server
Reply With Quote #7

Cloudflare is only for websites as far as I know.
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edon1337
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Old 01-13-2018 , 11:42   Re: Ddos on server
Reply With Quote #8

Yep, you're right, they support only HTTP/S. Guess you have to switch to a new host.
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Last edited by edon1337; 01-13-2018 at 11:43.
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brlight
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Join Date: Jun 2011
Old 01-13-2018 , 14:56   Re: Ddos on server
Reply With Quote #9

OVH , check their Website
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joropito
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Old 01-15-2018 , 11:58   Re: Ddos on server
Reply With Quote #10

If the attack don't overload your connection but affects your HLDS stability, you could try filtering using iptables.
As I see your capture, they're using more than 5k bots doing A2S_INFO attack.
Best thing you can try is to rate-limit A2S_INFO packets to avoid high cpu usage on your hlds.


Any action you may take on the server could not stop nor avoid connection overload.
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