IPTables Connection Tracking

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Introduction

IPTables is a Linux software firewall that supports stateful connection tracking of TCP/IP connections.

To view the current number of tracked connections: 

cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count

To see the maximum number of allowed connections: 

cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max
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