Flood blocking

[Mike Wright]

Ashley M. Kirchner wrote:
> 
>    I currently have one system I'm testing the following rules on:
> 
>    iptables -N SSHSCAN
>    iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j SSHSCAN
>    iptables -A SSHSCAN -m recent --set --name SSH
>    iptables -A SSHSCAN -m recent --update --seconds 300 --hitcount 2 
> --name SSH -j DROP
> 
> 
>    And just by watching it for the past few days, those rules seem to 
> work pretty well.  So, it made me wonder, can I apply the same rules for 
> FTP and e-mail (with the correct port information of course.)
> 
>    I get *a lot* of failed FTP attempts.  Especially when the sun comes 
> up in Asia.  And then there's the e-mail spam that also doesn't stop.  
> So, can I take those same set of rules above, replace the port number 
> and name, and have them work for FTP and e-mail as well?
> 
>    Am I overlooking something really obvious?

Hi Ashley,

I had somebody pounding at a pop server so I applied a similar set of 
rules, different seconds and hitcount.  Eventually the miscreant(s) got 
bored and went away.

I'd have to say yes.

hth, :m)