iptables DROP, performance effect with n lines?
The method I've employed to protect my server is to add a -s INPUT $IPADDR -j DROP line to my iptables for each ip address that i see doing suspicious things in my logs. This list is growing. I am wondering if anyone has a better solution -- but particularly, I am wondering if this will really start to slow things down as the list gets longer. 100 hosts, 1000 hosts, 10,000 hosts? Any experience?
what suspicious things?
you can use fail2ban, which will block these ip's for a certain time after a certain number of attempts
or you can use iptables to do the same.
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