A Firewall in general will filter packets dependant upon Layer 3 specifications. You can permit or block source and Dest IPs. However a Statefull Firewall goes to Layer 3 and above. You can now filter or perform certain tasks dependant upon the state of your traffic flow or your TCP/UDP ports and application you are using. This allows for a more granular filtering ability and if set up correctly can prevent virus' and intrusions, DOS, DDOS attacks along with other preventions. Today all firewalls (at least the ones I know) are statefull firewalls...Please rate...
To have a complete idea about what is stateful firewall it?s very important to understand what differ this technology from others.
Here is the explanation of the three main firewall technologies:
Stateful inspection - Stateful inspection firewalls, also known as stateful packet filters, allow/deny traffic based on source destination and service while maintaining a state table to keep track of existing connections. This ensures that inbound connections are valid replies to outbound requests.
Proxy - Connections are initiated on the firewall on behalf of the requester. Traffic does not pass through a proxy-based firewall but rather is recreated by the firewall, this type of technology works at the application layer.
Packet filtering - Inspects the incoming and outgoing packets and allows/denies traffic based on source, destination, protocol, and service.
DocumentationCode download linksGoalRequirementLimitationsSupported ISR
and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationConfigure one of the connectivity
options to access the Cisco IMC from the n...
Firepower Threat Defense (NGFWv) on UCS E-series - Transparent Mode in
HA DocumentationCode download linksGoalRequirementLimitationsSupported
ISR and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationCo...
Question I am currently unable to specify "crypto keyring" command when
configuring VPN connection on my cisco 2901 router. The following
licenses have been activated on my router :