-1
votes
0answers
13 views

/boot/.IpTables use high cpu in my server [duplicate]

i am newbie in network administrator.. One week ago, my server work perfectly. My Server can serves 600++ users at the same time and only use 40% cpu. Today there is something wrong with my server. ...
-1
votes
1answer
33 views

How to tell if the server was down because of DDoS of another reason?

my server was down for a couple of hours during the night. i see in the cpu load monitoring in the amazon AWS console that it was 100% load. also, the network in jumped (but no that dramatically) so ...
3
votes
3answers
419 views

Can't stop DDOS [duplicate]

I need a little help dealing with ddos. I'm experiencing 1gb ddos attack on my server and I don't know how to stop it. (1gbs is the maximum speed of the server.) I've the following iptables rules: ...
1
vote
0answers
101 views

sshd running at 100%

I'm running an Ubuntu/WordPress server on Amazon EC2 which is experiencing problems every 24-48 hours: I get a CPU alarm from EC2, log into the server, and discover sshd is running at 99.9% CPU. This ...
1
vote
1answer
90 views

What is the best way to compare vhost traffic? [closed]

Recently one of my servers has been subjected to malicious ddos attacks. I have about 12 websites hosted on the server which uses name based v-hosting. I am trying to identify which virtual host(s) ...
0
votes
4answers
75 views

How to identify which website on my instance is receiving lots of traffic?

I am new to server administration and have just setup a new quad core instance which hosts around 15 websites. Over the past couple of days my server load has been averaging at around 15.00. I ...
0
votes
1answer
414 views

Ubuntu Server DDoS protection [duplicate]

I've seen many articles on DDoS protection, but none work. I need protection for a socket server i'm running on the server. It's running on port 9876 and it's for a flash-based game. when it gets ...
1
vote
1answer
736 views

Amazon EC2 abuse [duplicate]

I am using amazon 85 ec2 instances. Day before yesterday got emails from AMAZON for AMAZON EC2 abuse. it says about the DOS attacks on remote host. Amazon mail content attached for your reference. ...
0
votes
4answers
276 views

How to set up notifications about server overload? [duplicate]

Possible Duplicate: What tool do you use to monitor your servers? How to get notified (preferably by email) when my webserver reaches certain amount of incoming requests? This way I'll be ...
1
vote
2answers
502 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 ...
1
vote
1answer
292 views

Restrict number of parallel connections on Apache server

I'm on an Ubuntu server running Apache2. I would like to protect myself against (d)dos and syn flood attacks and therefore try to limit the number of parallel connections per client IP. I've heard ...
0
votes
1answer
159 views

Is it possible to block IP access at the NIC

I am receiving a lot of traffic from Portugal and Brazil, not our normal audience on one my servers, and after running Wireshark on a 1 minute TCP dump, Almost every request (close to 10 megs total in ...