iptables not woking properly

mitter1989 · 09-09-2013, 08:25 AM

Hi folks,

Today, I have faced a peculiar problem while one of my server was on DOS attack. I got number of request from unknown IP address x.x.x.x.

I am using CentOS 6.0. I tried to block this IP x.x.x.x with following command as a root user.

iptables -A INPUT -i eth0 -s x.x.x.x -j DROP

but it could not help me.

my other rules are working fine.

Looking forward for help on the same.

Thanks in advance.
regards,
Mitter

david1941 · 09-09-2013, 08:50 AM

Your entry: iptables -A INPUT -i eth0 -s x.x.x.x -j DROP

ADDS the rule to the table. The offending packets have already been handled. The solution? Use "iptables -I INPUT ..." Inserts at beginning of table.

mitter1989 · 09-10-2013, 02:23 AM

Thanks! Dave

-MITTER

SAbhi · 09-10-2013, 03:48 AM

iptables -I INPUT -s x.x.x.x -j DROP

will also do the same job.