Stateful vs Stateless Firewall – Know the difference in 2023


stateful vs stateless firewall

Stateless vs Stateful Firewall

Stateless and Stateful Firewalls are 2 commonly referred to as Firewall types.

In Stateful vs Stateless Firewall, Stateless Firewall works by treating each packet as an isolated unit, Stateful firewalls work by maintaining context about active sessions and use “state information” to speed packet processing.

Related – WAF vs Network Firewall 

In fact, Stateful Firewalls use the concept of a state table where it Stores the state of legitimate connections. Stateless Firewall filters based on header information in a packet like Source IP, Destination IP, port number etc.

On the contrary, Stateful Firewalls filter packets by matching to valid states in the state table.

Some of the benefits that can be reaped from Stateless Firewalls include faster performance and low memory utilization.

Stateful Firewalls benefits include higher security and performing application layer filtering to a certain level.

Stateful vs Stateless Firewall –

Treats each packet in isolation and does not relates to connection state
Stateful firewalls maintain context about active sessions and use “state information” to speed packet processing
Filtering decision
Based on information in packet headers
Based on flows
Memory and CPU intensive
Connection Status
Related terms
Header info, IP address, port no etc.
State information, pattern matching etc.


Download the difference table here.





Hope through the above comparison table you would have understood the difference between stateless and stateful firewall. Read these differences as well –

–  IDS vs IPS vs Firewall

Network-Based Firewall vs Host-Based Firewall

Web Application Firewall vs Network Firewall

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