Server Fault Stack Exchange
Server Fault Stack Exchange

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?

624 questions
0
votes
1 answer

DDoS & Amazon Lightsail Load Balancing

One of the sites I host on Amazon Lightsail recently became victim of a DDoS attack. I've been able to fend it off using Cloudflare's "I'm under attack" mode. I'm wondering if load balancing would have help deal with the attack. Should I create a…
ServerFaultNewbie
  • 247
  • 1
  • 3
  • 8
0
votes
1 answer

iptables - synproxy target don't mark packets as INVALID

I am writing iptables rulles and have problem with preventing flood SYN. Found that synproxy should be the right solution. But when testing, I found that it don't mark packets as INVALID, so iptables rule wont drop it. $iptables -t raw -A…
Abc Xyz
  • 608
  • 1
  • 8
  • 17
0
votes
0 answers

Cisco ACL to block external DNS queries [RESOLVED]

One of the routers that I administer is getting bombarded with external DNS queries from the internet. This is a network border router which has a DNS server configured. There is an interface facing the internet which is getting all these DNS…
Peter Franca
  • 1
  • 1
0
votes
2 answers

How can I test the security of my server? I think I am under DoS

I got a server with Windows OS. The server is running many VMs using HYPER-V. The VMs are exposed to the internet. There is a single VM that is running NAT using windows RRAS, ehich is connected to the router on one end and to the internal network…
Giorgio Busoni
  • 101
0
votes
1 answer

OVH server DDOS attack protection

I purchased the server on ovh.com. (not gaming, regular) For 3 days now I’ve been trying to set up protection against DDOS flood. Nothing comes out. Support responds once a day and does not give an intelligent answer. Therefore, I appeal to you. How…
Xhonor
  • 1
0
votes
2 answers

Use ufw to block users from accessing my server via a specific vpn

The last couple of days I've been having some weird small DDoS attacks on different VPS's I have online. The first one I detected using netstat and I noticed a bunch of IPs that were from a different region (resulting in Singapore) so I used ufw…
Mihail Minkov
  • 107
  • 7
0
votes
0 answers

continuous hits my webserver with wordpress or Magento request but im not using either

I have a PHP website on AWS which is getting bad gateway so I have looked into Nginx server logs and found that an errors connect() to unix:/run/php-fpm/php-fpm.sock failed (11: Resource temporarily unavailable) while connecting to upstream when I…
Bharath
  • 101
  • 3
0
votes
1 answer

How to Hide real DNS server from OpenVPN?

OpenVPN show the DNS server in clear when you connect but i want to hide that from public. ( It shows that in logs and network adapter in Windows for example ) DNS server alreadly have rules to receive DNS request only from the VPN IP address. ( i…
rayjhp
  • 1
  • 2
0
votes
2 answers

How do I limit ping (ICMP) responses on a debian 10 server?

I have a VPS with debian 10 installed, primarily used for website hosting. when I issue a ping to the server from a remote machine, I am able to and receive responses for packet sizes up to around 64Kb using -s 65507 flag. using sudo also enables me…
pulsar
  • 193
  • 1
  • 2
  • 5
-1
votes
2 answers

How exactly DDoS protection is built

When speaking about the DDoS protection, I can understand that it is massively dependent on the filter capacity. When building your own DDoS protection, it is dependent on the amount of traffic you can filter, and if DDoS attack exceeds that limit,…
dnleiman
  • 23
  • 4
-1
votes
1 answer

Am I under ddos attack ? Many random requests (usually to images)

Do requests like these look like a DDOS attack ? 180.157.250.126 /9301451791bb460e8a5aec3e123884ba.jpg <<< match 180.157.250.126 /b29a2302afd6dfd918a2b7c3b6a05e31.jpg <<< match 183.199.78.159 /img/6445ae665386ca14406c1d8614d44b36.jpg <<<…
adrianTNT
  • 1,077
  • 6
  • 22
  • 43
-1
votes
2 answers

Using UFW to completely block internet provider

I am facing a DDOS attack from a few hundred IP addresses, all of them coming from various cities in India and have the same organization: "................ for GPRS Service". (I'm not mentioning the whole name). The attack started around 5 hours…
ToX 82
  • 119
  • 1
  • 5
-1
votes
1 answer

Configure an anti-DDOS on a server with iptables and/or VPN by using OVH's anti-DDOS

I am hosting my server on my computer at home and I would like to install an anti-DDOS system by using the anti-DDOS managed by OVH. I am actually redirecting my domain name to the IP of one of my OVH servers and this one redirects with iptables all…
Benjamin Loison
  • 141
  • 6
-1
votes
1 answer

linux ddos attack and blocking

im checking ddos using this script: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n it will show something like this 24 220.160.239.126 25 42.80.231.240 26 182.109.15.223 29 218.64.39.93 im blocking the ip using: route add…
Teddybugs
  • 153
  • 10
-1
votes
1 answer

How to prevent Source Engine Query DDoS Attack?

I recently started a game hosting company and one of my boxes is being hit very hard by what i believe is a botnet(getting thousands of ip addresses sending traffic to a port where a game server is located.) I managed to log onto the server and…
Jack
  • 1
  • 1
1 2 3
…
41 42