Next-Generation Firewalls vs. Traditional Firewalls
Traditional firewalls and their successors have several aspects, including packet filtering and stateful inspection. A next-generation firewall, on the other hand, can perform all of the functions of a regular firewall, but better and with additional security measures.
For instance, NGFWs enhance packet filtering through the use of deep packet inspection (DPI). Additional information on DPI is included below.
Stateful inspection replaced stateless inspection in prior firewall versions, in which the firewall inspected each packet individually. When firewalls achieved stateful inspection, they were able to discern the properties of packets and allow only those with known active connections to pass.
Deep packet inspection leverages the strengths of stateful inspection, augments them with additional capabilities, and generally improves upon them.
Additionally, NGFWs incorporate characteristics such as deep packet inspection (as described above), intrusion prevention systems, IP reputation, and application layer inspection.
Deep Packet Inspection and Packet Filtering (DPI)
Packet filtering, which is also included in classic firewalls, is used to determine if traffic entering a network is safe to accept or should be stopped. A firewall uses a collection of rules or policies defined by an administrator to determine whether a packet should be routed to its intended destination inside a network or dropped from the connection.
DPI augments packet filtering in a next-generation firewall to tackle advanced malware threats. Typical packet filtering just examines the header of the packet. DPI examines the contents of the packet and compares them to a database of attack signatures. Signatures are unique patterns of bytes associated with a particular piece of malware. The distinction is comparable to that between a mail carrier verifying the address of a letter and a TSA agent inspecting each and every person’s luggage.
Intrusion Preventative Measures (IPSs)
Intrusion prevention systems (IPSs) are evolutions of intrusion detection systems (IDSs) and are critical for spotting threats, blocking them from gaining access to the network, and notifying administrators about the threat. The IPS programme continuously monitors the network and detects threats. An IPS can identify threats in a variety of ways:
Detection using signatures
Detection of statistical anomalies
Detection of comprehensive protocol analysis
Signature-based detection compares the bytes in a packet to the signatures of known threats, which are frequently derived from third-party intelligence feeds. While employing signatures is a consistent method of detecting threats, there is a possibility that an attack will have unknown signatures.
Statistical anomaly detection compares monitored traffic to a baseline established by an administrator for what constitutes acceptable network traffic behaviour. When traffic begins to behave abnormally, it might be banned or flagged for inspection. While this enables the identification of innovative sorts of threats, it also alerts personnel more frequently to false alarms.
Additionally, stateful protocol analysis detection relies on a profile of permitted behaviour, similar to statistical anomaly detection. However, an IPS that employs this detection mechanism concentrates on the protocols from which and to which traffic is being delivered. For instance, an IPS will assess whether the traffic of an application has a pair of protocols that indicate malicious behaviour.