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Questions tagged [ddos]

A distributed denial of service attack (DDoS) occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. These systems are compromised by attackers using a variety of methods.

A distributed denial of service attack (DDoS) occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. These systems are compromised by attackers using a variety of methods.

For information on what to do about a DDoS attack that is underway, see How can I stop a currently active DDoS attack?

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What does AWS EC2 DDOS protection shield throw when activated? HTTP(S) 503?

What does Amazon AWS EC2 DDOS protection shield throw when activated? HTTP(S) 503? At which amount can this happen? 5000 - 10000 requests at "the same time"? Is this public info and available somewhere?
uav
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I'm Under attacks even with mod_evasive mod_security and fail2ban

I have my centos fresh server with no problem, I have httpd, named but I get 150 failed logins per 10 minute. I also use Fail2Ban with maxretry 1 findtime 6h. and mod_evasive mod_security default settings just a Bit Tweaked. but When I Disconnect to…
Ariya Mirzaei
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Can CDN caching prevent DoS attacks?

Let's say I use Cloudflare to cache my images, CSS, and JS files. Requests for the HTML content itself still hit my server and an attacker could use that to his advantage. However, if I tell Cloudflare to cache HTML as well, would a DoS attack be…
dodov
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How to prevent a lot of strange requests

I have and https site, which for one week receives a lot of strange requests just to main web site page (+ 2 js and 1 css files, but no images). From nginx logs it looks like: 193.151.188.114 - - [02/Feb/2021:13:09:32 +0100] "GET / HTTP/1.1" 200…
Index
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UFW Weird ICMP log record - Pinging is blocked

In the log records below I have replace my eth MAC address with ETH_MAC_ADDRESS the IP of my server with MY_SERVER_IP and other IPs with STRANGE_IP plus a number to distingue. Jan 29 15:11:48 cld kernel: [140229.731612] [UFW BLOCK] IN=eth0 OUT=…
fat_mike
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Extremely high incoming traffic on web server but no abnormalities in log files

Today we recorded extremely high incoming traffic (1 Gbps) on our Debian Webserver (green chart). On an average day it's at a maximum of about 20-30 Mbps. Firewall as well as fail2ban are configured correctly and should be working fine. We checked…
arety_
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How much DDOS mitigation one should expect from VPS provider?

We had a stateful WebRTC application which received some DDOS attacks. The server had 2gbits port, so any attack over 2gbits was able to make it unavailable. Afterwards we refactored the application to be stateless and now we can deploy it to any…
Eren CAY
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DDOS protection without IP?

Is there any way to do DDOS protection without logging IP addresses? Any way to stop attacks without noting down IP addesses? This is because of data protection regulations
protectgoodlivingbeingask
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DOS Attack from local network to wan, identification and Prevention

Past few days, we have been facing a possible syn flooding DOS attack. This attack happens twice a day (afternoon and at night), one random IP in our network gets active (even though the system on which the ip is assigned to is inactive/shutdown)…
Akhil Abraham
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How to stop requests on PHP server while it is running cron job sheduled PHP script?

I have a situation when some DDOS attacks are putting my PHP server down. Occasionally. I'm using AWS with auto scaling groups, so it is not a problem. The problems start when this server is going down in the middle of the cron job scheduled PHP…
Yevgeniy Afanasyev
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Meaning of Log File (DDOS)

We are currently facing attacks (probably DDOS) on our server. The incoming network traffic goes from an average of 20Mbps to 1Gbps in just 2-3 minutes. The lines in our log files usually look like: 101.101.101.101 - - [23/Nov/2020:01:01:01 +0200]…
arety_
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Hitch rate limiting without Varnish

Good morning, Is there a way to implement per-site and per-IP rate limiting on Hitch before the request reach Varnish? I tried to handle some DoS attack using Varnish rate limiting, but the DoS can overload the connection between Varnish and Hitch,…
RATEFIARISON Aina Manoa
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Azure container instance receives tremendous traffic even right after its creation

I've created an Azure container instance with MSSQL container image. It starts. However before even login, or even putting the URL in to use, I've checked the container logs and it's being hit with traffic. As this is a MSSQL DB server, it receives…
inckka
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Logging inbound firewall pings, organization by IP

Is there some way or a program that can do this? A VPS of mine has been receiving a very large number of pings, almost to mini-ddos level. I need to track the pings made, by IP address (or even just output to a simple log file) Is there anything…
Cyclone
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Does cloudflare provide anti-DDoS protection for dedicated servers?

I have a dedicated server that sometimes gets DDoS attacked. Does Cloudflare give you protection for dedicated servers or is it for websites only?
Catgirl21
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