Full-service Internet Marketing & Web Development
Recent Posts
Sponsors
 |
Get list of all unique IP Addresses connected to your serverMike Peters, 02-27-2010 |
Want to find out if your server is under DoS attack?
Or maybe you want to optimize your architecture, understanding the network footprint of each of your servers?
Using a combination of handy shell commands, it's easy to construct a list of all IP addresses connected to your server, sorted by count:
On FreeBSD:
On Linux:
Sample output:
1 114.56.110.115
1 114.56.110.90
1 67.128.224.129
2 114.56.110.85
4 114.56.110.99
5 208.53.167.125
7 67.128.224.128
14 114.56.110.116
15 114.56.110.125
18 114.56.110.84
Blocking offenders is as easy as:
On Linux:
On FreeBSD:
Or maybe you want to optimize your architecture, understanding the network footprint of each of your servers?
Using a combination of handy shell commands, it's easy to construct a list of all IP addresses connected to your server, sorted by count:
On FreeBSD:
netstat -nat | sed -n -e '/ESTABLISHED/p' | awk '{print $5}' | sed 's/\./ /g' | awk '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -n
On Linux:
netstat -ntu | sed -e 's/::ffff://g' | awk '{print $5}' | cut -d : -f1 | sort | uniq -c | sort -n
Sample output:
1 114.56.110.115
1 114.56.110.90
1 67.128.224.129
2 114.56.110.85
4 114.56.110.99
5 208.53.167.125
7 67.128.224.128
14 114.56.110.116
15 114.56.110.125
18 114.56.110.84
Blocking offenders is as easy as:
On Linux:
/sbin/iptables -I INPUT -s 114.56.110.84 -j DROP
On FreeBSD:
echo "ALL : 114.56.110.84 : deny" >> /etc/hosts.allow
|
|
Mike Peters, 03-23-2010 |
Here's how to get a list of all file descriptors by process:
lsof | awk '{print $1}' | sort | uniq -c | sort -n
 |
mba, 06-10-2010 |
Admiring the time and effort you put into your blog and detailed information you offer!
 |
hiwaar, 06-25-2010 |
Thanks for the valubale information
|
|
Mike Peters, 07-29-2010 |
Thanks @mba
For anyone using Java, this line is useful - shows how many times each JAR is open:
For anyone using Java, this line is useful - shows how many times each JAR is open:
lsof | grep java | awk '{print $NF}' | sort | uniq -c | sort -n | tail
|
|
Subscribe Now to receive new posts via Email as soon as they come out.
Comments
Post your comments
