Stateless vs Stateful Firewall – Know the difference

 

stateless vs stateful firewall

Stateless & Stateful Firewall

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

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.

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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.

Stateless vs  Stateful Firewalls –

PARAMETERSTATELESS FIREWALLSTATEFUL FIREWALL
Philosophy
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
Low
High
Security
Low
High
Connection Status
Unknown
Known
Performance
Fast
Slower
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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