Urgent: Under attack - need tcpdrop help
glarkin at FreeBSD.org
Tue May 24 20:42:29 UTC 2011
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On 5/24/11 4:29 PM, Andy Wodfer wrote:
> One of my FreeBSD servers is currently being attacked (DDOS) and I'm
> blocking IP addresses in my firewall. However, there are a large number of
> hung tcp connections and I want them gone.
> Can anyone help me with a script (command line) that can read a netstat -n
> and tcpdrop all IP addresses that has more than 10 connections or a more
> manual command where I can input an IP and it will drop all connections from
> that IP regardless of port?
> Thanks in advance!
> Shell scripting isn't what I'm best at unfortunatly ...
This will drop all connections to/from IP address 192.168.22.22:
tcpdrop -l -a | grep 192.168.22.22 | sh
Just substitute your desired IP address, and that will do the trick.
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