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Restrict-parallel-connections-using-iptables

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November 02, 2011, at 01:54 PM by 117.192.145.37 -
Changed lines 8-21 from:

Allows you to restrict the number of parallel connections to a server per client IP address (or client address

block).

[!] --connlimit-above n

Match if the number of existing connections is (not) above n.

--connlimit-mask prefix_length

Group hosts using the prefix length. For IPv4, this must be a number between (including) 0 and 32. For IPv6,

between 0 and 128.

to:

Allows you to restrict the number of parallel connections to a server per client IP address (or client address block).

[!] --connlimit-above n Match if the number of existing connections is (not) above n.

--connlimit-mask prefix_length Group hosts using the prefix length. For IPv4, this must be a number between (including) 0 and 32. For IPv6, between 0 and 128.

November 02, 2011, at 01:53 PM by 117.192.145.37 -
Added lines 1-52:

(:Google1:) (:Googlemm:)


Restrict parallel connections Using Iptables


connlimit

Allows you to restrict the number of parallel connections to a server per client IP address (or client address

block).

[!] --connlimit-above n

Match if the number of existing connections is (not) above n.

--connlimit-mask prefix_length

Group hosts using the prefix length. For IPv4, this must be a number between (including) 0 and 32. For IPv6,

between 0 and 128.

Examples:

Allow 2 telnet connections per client host (:table border=1 width=80% bgcolor=#cccc99 cellspacing=0 :) (:cellnr:) iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-above 2 -j REJECT (:tableend:)

You can also match the other way around: (:table border=1 width=80% bgcolor=#cccc99 cellspacing=0 :) (:cellnr:) iptables -A INPUT -p tcp --syn --dport 23 -m connlimit ! --connlimit-above 2 -j ACCEPT (:tableend:)

Limit the number of parallel HTTP requests to 16 per class C sized network (24 bit netmask) (:table border=1 width=80% bgcolor=#cccc99 cellspacing=0 :) (:cellnr:) iptables -p tcp --syn --dport 80 -m connlimit --connlimit-above 16 --connlimit-mask 24 -j REJECT (:tableend:)

Limit the number of parallel HTTP requests to 16 for the link local network (ipv6) (:table border=1 width=80% bgcolor=#cccc99 cellspacing=0 :) (:cellnr:) ip6tables -p tcp --syn --dport 80 -s fe80::/64 -m connlimit --connlimit-above 16 --connlimit-mask 64 -j REJECT (:tableend:)


(:Google1:) (:Googlemm:)

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Page last modified on November 02, 2011, at 01:54 PM