Shulou(Shulou.com)06/01 Report--

Iptables uses ipt_recent for anti-brush restrictions (log is accessed more than 240times in 1 minute and discarded)

1. Iptables needs to support ipt_recent module

2. Modify the limits of ip_list_tot and ip_pkt_list_tot

Chmod 600 / sys/module/ipt_recent/parameters/ip_list_totecho 10240 > / sys/module/ipt_recent/parameters/ip_list_totchmod 600 / sys/module/ipt_recent/parameters/ip_pkt_list_totecho 500 > / sys/module/ipt_recent/parameters/ip_pkt_list_tot

3. Set up iptables syslog log

# Edit / etc/syslog.conf add the following line

Kern.=debug / var/log/firewall/http_access.log# create a new log directory mkdir / var/log/firewall/# restart service / etc/init.d/syslog restart

4. Establish iptables strategy

# establish record sheet iptables-I INPUT-p tcp-- dport 80-d 192.168.160.44\-m state-- state NEW-m recent-- name httpuser-- set# exceed the limit log iptables-An INPUT-m recent-- update-- name httpuser-- seconds 60\-- hitcount 240-j LOG-- log-level 5-- log-prefix 'HTTP attack:' # exceed the limit DROPiptables-An INPUT-m recent-update-name httpuser-seconds 60\-hitcount 240j DROP# Note: view httpuser record / proc/net/ipt_recent/httpuser

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