Difference between revisions of "Limiting number of simultaneous connections"
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[[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Iptables configuration]] > [[Limiting number of simultaneous connections | [[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Iptables configuration]] > [[Limiting number of simultaneous connections]] | ||
==Using connlimit module== | ==Using connlimit module== | ||
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[[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Iptables configuration]] > [[Limiting number of simultaneous connections | [[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Iptables configuration]] > [[Limiting number of simultaneous connections]] | ||
Latest revision as of 13:24, 14 July 2022
Home > CentOS > CentOS 6.x > Iptables configuration > Limiting number of simultaneous connections
Using connlimit module
We can use connlimit module of iptables to limit number of simultaneous connections to server in following manner
iptables -I INPUT -p tcp --syn --dport 22 -m connlimit --connlimit-above 1 -j REJECT
This will allow only one ssh connection to server per client.
To limit number of simultaneous connections based on subnets we can use below syntax
iptables -p tcp --syn --dport 22 -m connlimit --connlimit-above 16 --connlimit-mask 24 -j REJECT
This would allow only 16 connections from each /24 network.
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