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43 lines
1.7 KiB
43 lines
1.7 KiB
4 months ago
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Allows you to restrict the number of parallel connections to a server per
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client IP address (or client address block).
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.TP
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\fB\-\-connlimit\-upto\fP \fIn\fP
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Match if the number of existing connections is below or equal \fIn\fP.
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.TP
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\fB\-\-connlimit\-above\fP \fIn\fP
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Match if the number of existing connections is above \fIn\fP.
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.TP
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\fB\-\-connlimit\-mask\fP \fIprefix_length\fP
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Group hosts using the prefix length. For IPv4, this must be a number between
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(including) 0 and 32. For IPv6, between 0 and 128. If not specified, the
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maximum prefix length for the applicable protocol is used.
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.TP
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\fB\-\-connlimit\-saddr\fP
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Apply the limit onto the source group. This is the default if
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\-\-connlimit\-daddr is not specified.
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.TP
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\fB\-\-connlimit\-daddr\fP
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Apply the limit onto the destination group.
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.PP
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Examples:
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.TP
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# allow 2 telnet connections per client host
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iptables \-A INPUT \-p tcp \-\-syn \-\-dport 23 \-m connlimit \-\-connlimit\-above 2 \-j REJECT
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.TP
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# you can also match the other way around:
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iptables \-A INPUT \-p tcp \-\-syn \-\-dport 23 \-m connlimit \-\-connlimit\-upto 2 \-j ACCEPT
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.TP
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# limit the number of parallel HTTP requests to 16 per class C sized \
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source network (24 bit netmask)
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iptables \-p tcp \-\-syn \-\-dport 80 \-m connlimit \-\-connlimit\-above 16
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\-\-connlimit\-mask 24 \-j REJECT
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.TP
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# limit the number of parallel HTTP requests to 16 for the link local network
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(ipv6)
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ip6tables \-p tcp \-\-syn \-\-dport 80 \-s fe80::/64 \-m connlimit \-\-connlimit\-above
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16 \-\-connlimit\-mask 64 \-j REJECT
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.TP
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# Limit the number of connections to a particular host:
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ip6tables \-p tcp \-\-syn \-\-dport 49152:65535 \-d 2001:db8::1 \-m connlimit
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\-\-connlimit-above 100 \-j REJECT
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