Linked Questions

1
vote
5answers
692 views

Identifying DOS attack [duplicate]

I'm suspecting that one of my servers is attacked some time ago. My question is how can I identify a DOS or DDOS attack while under attack or after the attack has finished?
0
votes
3answers
826 views

DDoS - How to detect an attacker IP address [duplicate]

Someone keep attacking my server, but unfortunately I've switched my OS to the FreeBSD, as I've earlier used Debian 5.0 Lenny, and none of netstat or tcpdump commands I used on Debian, works on ...
5
votes
2answers
940 views

DDOS attack - How to prevent [duplicate]

Recently I read about Denial of Service attack on Amazon & PayPal. I am curious that how this is performed. These big companies must have huge servers, so DOS would require billions of bots to ...
1
vote
2answers
586 views

Software vs. Hardware Appliance DDOS & Firewalls [duplicate]

I run several Ubuntu Servers (virtualized) and have fail2ban installed for DDOS mitigation. For a firewall, each server has iptables. I'm evaluating my security options and was wondering how well ...
-2
votes
2answers
702 views

DDoS Mitigation with round robin DNS? [duplicate]

Alright, so my friend and I are setting up a new website. We expect heavy DDoS attacks, so our plan is to use nginx to proxy from various cloud servers so that people can't find our actual server's ...
1
vote
1answer
2k views

pfSense + DDoS Protection [duplicate]

I run a gaming community on a colo with a 100Mbps port. I want to buy a very cheap 35 dollar server with the same 100Mbps port, and run pfSense to use as a hardware firewall. I'm dealing with a bunch ...
1
vote
4answers
653 views

Distributed web server to stop DDos attacks? [duplicate]

I have been thinking about a way to hinder DDos (Distributed Denial of Service) attacks (which seems to be a hot topic at the moment) by placing a signed Java Applet on the web site. This Java Applet ...
4
votes
2answers
395 views

How to prevent DDoS attacks? [duplicate]

I am a creator of a flash game server. I use cloudflare for my site, however the game tcp server cant be protected by CloudFlare. For about 2 months some person DDoSes my game using direct ip. Every ...
-2
votes
1answer
610 views

Possible form for a ddos attack? [duplicate]

I have kinda asked this before. I've set up a server that serves my website, dns and some gameservers. However, when I check my routers firewall log, I get alot of incoming UDP packets blocked on the ...
1
vote
4answers
778 views

Solution for DDOS [duplicate]

My server is under DDoS attacks. I see my access log and get something: 968966 93-97-53-41.zone5.bethere.co.uk - - [27/Jul/2011:12:13:58 +0700] "GET /forum/forum.php HTTP/1.1" 200 91231 "-" ...
2
votes
3answers
564 views

DDOS by several IPs with one connection [duplicate]

I have a site that was being hit with a DDOS the same time every day for the past month, and after spending a month researching and pinpointing the bug, we enacted a bash script which if the ...
1
vote
2answers
1k views

Using Free/Open BSD + pf as a DDoS filter [duplicate]

Is using Free/Open BSD + pf a workable option for filtering DDoS? Which of the two would perform better under heavy load? (SYN flood maxing a 1 gbit pipe) Is this even an option to consider, or is a ...
3
votes
3answers
403 views

Anti-DDoS Question [duplicate]

Our company´s main owner (telecon group) wants us to deploy anti-DDoS mechanisms, such as Arbor Pravail, which is a great idea. Although... I have a question... If our main ISP Backbone provider have ...
2
votes
1answer
188 views

Received Notification of my server be involved in “DNS amplification attack”. How can I stop? [duplicate]

I just received an email from my website internet provider that my server has been "involved as open resolvers in DDoS attacks (DNS Reflection) over the past few weeks." Here is the full email: ...
1
vote
1answer
474 views

DROP vs REJECT DDoS [duplicate]

I asked somewhere else, and I got this response: Using DROP turns any type of DDoS attack into a SYN flood, because your server expects ACK responses which it will never get. Even if you can fine ...

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