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Old 08-11-2016, 01:01 PM   #1
Registered: Oct 2013
Posts: 527

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How to ban myself if i load webpage more than 1 times at a time?


im trying to achive that more than 1 simultaneous connections from one /24 subnet is rejected by netfilter

But i cant manage to get rejected when Loading hosted website simultaneously several times

# iptables -L INPUT
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:http
ACCEPT tcp -- anywhere anywhere tcp dpt:http state RELATED,ESTABLISHED
REJECT tcp -- anywhere anywhere tcp dpt:http flags:FIN,SYN,RST,ACK/SYN #conn/24 > 1 reject-with icmp-port-unreachable
DROP tcp -- anywhere anywhere tcp dpt:http flags:FIN,SYN,RST,ACK/SYN #conn/32 > 150
(based on commands from

CentOS 6.x

perl /etc/csf/
Testing ip_tables/iptable_filter...OK
Testing ipt_LOG...OK
Testing ipt_multiport/xt_multiport...OK
Testing ipt_REJECT...OK
Testing ipt_state/xt_state...OK
Testing ipt_limit/xt_limit...OK
Testing ipt_recent...OK
Testing xt_connlimit...OK
Testing ipt_owner/xt_owner...OK
Testing iptable_nat/ipt_REDIRECT...OK
Testing iptable_nat/ipt_DNAT...OK
What is wrong please? Thank you
Old 08-11-2016, 03:38 PM   #2
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Registered: Dec 2003
Location: The Key Stone State
Distribution: CentOS Sabayon and now Gentoo
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Not sure abut the rules you have above but this one seems to work:

iptables -A INPUT -p tcp -m tcp --dport 80 -m conntrack --ctstate NEW -m connlimit --connlimit-above 1 -j REJECT --reject-with icmp-host-prohibited
Old 08-16-2016, 09:33 AM   #3
Registered: Apr 2009
Location: Oz
Distribution: slackware64-14.0
Posts: 875

Rep: Reputation: 282Reputation: 282Reputation: 282
Rule order is everything in iptables.

Rule 1 accepts all traffic to the http port

Your blocking rule is never tested as rule one matches first.


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