Juniper SRX Packet Flow in detail (part 2)

Juniper SRX Packet Flow in detail (part 2)

SECURITY SERVICES PACKET WALK

About Services ALG Module:

An Application Layer Gateway (ALG) is a software component that is designed to manage specific protocols such as Session Initiation Protocol (SIP) or FTP on Juniper Networks devices running Junos OS. In Juniper SRX this is where all the services are being matched.

It has multiple module to process the services based on there service request.

1) AppID (Packet): The APPID (application identification) Module is a Junos OS feature that identifies applications as constituents of application groups in TCP/UDP/ICMP traffic.

2) IDP: This Module is use for Intrusion Detect Prevention.

3) SSL Proxy: This Module is use for SSL Inspection (ssl encrypted packet) 

4) ALG: The ALG module is responsible for Application-Layer aware packet processing.

5) UTM: With UTM module, you can implement a comprehensive set of security features that include antispam, antivirus, Web filtering, and content filtering protection.

6) AppFW: This Module is use for identifying and inspecting applications.

7) UserFW: UserFW module is foe identifying the users, basically it's identity awareness.