Mastering Proxmox - Third Edition

nf_conntrack_max

This value defines the maximum size of a netfilter connection tracking table. This table keeps a record of all live connections and deletes them when a connection is closed. By default, the size of this table is 65,536 bytes. While for most of the nodes, this is perfectly fine, for high-volume connection servers, such as DNS or web server, this table may become full quickly. For a Proxmox node, which holds lots of high-traffic VMs, this value needs to be increased. We can check the current value of nf_conntrack_max using the following command:

    # sysctl -a | grep nf_conntrack_max  

The following command will show you the number of current live connections in the node:

    # sysctl -a | grep nf_conntrack_count  

The following screenshot ...