Module 'MUX' (Multiplexer for Applications Traffic)

R80.20 introduced a new layer between the Streaming layer and the Applications layer - MUX (Multiplexer).

Applications are registered to the Streaming layer through the MUX layer.

The MUX layer chooses to work over PSL Passive Streaming Library. Packets may arrive at Security Gateway out of order, or may be legitimate retransmissions of packets that have not yet received an acknowledgment. In some cases, a retransmission may also be a deliberate attempt to evade IPS detection by sending the malicious payload in the retransmission. Security Gateway ensures that only valid packets are allowed to proceed to destinations. It does this with the Passive Streaming Library (PSL) technology. (1) The PSL is an infrastructure layer, which provides stream reassembly for TCP connections. (2) The Security Gateway makes sure that TCP data seen by the destination system is the same as seen by code above PSL. (3) The PSL handles packet reordering, congestion, and is responsible for various security aspects of the TCP layer, such as handling payload overlaps, some DoS attacks, and others. (4) The PSL is capable of receiving packets from the Firewall chain and from the SecureXL. (5) The PSL serves as a middleman between the various security applications and the network packets. It provides the applications with a coherent stream of data to work with, free of various network problems or attacks. (6) The PSL infrastructure is wrapped with well-defined APIs called the Unified Streaming APIs, which are used by the applications to register and access streamed data. (passive streaming) or CPAS (active streaming).

Syntax

• On the Security Gateway Dedicated Check Point server that runs Check Point software to inspect traffic and enforce Security Policies for connected network resources. / each Cluster Member Security Gateway that is part of a cluster., run in the Expert mode:

  fw ctl debug -m MUX + {all | <List of Debug Flags>}

• On the Scalable Platform Security Group, run in the Expert mode:

  g_fw ctl debug -m MUX + {all | <List of Debug Flags>}

Flag	Description
active	CPAS (active streaming) Note - Also see Module 'CPAS' (Check Point Active Streaming).
advp	Advanced Patterns (signatures over port ranges)
api	API calls
comm	Information about opening and closing of connections
error	General errors
http_disp	HTTP Dispatcher
misc	Miscellaneous helpful information (not shown with other debug flags)
passive	PSL (passive streaming) Note - Also see Module 'PSL' (Passive Streaming Library).
proxy_tp	Proxy tunnel parser
stream	General information about the data stream
test	Currently is not used
tier1	Pattern Matcher 1st tier (fast path)
tls	General information about the TLS
tlsp	TLS parser
tol	Test Object List algorithm (to determine whether an application is malicious or not)
udp	UDP parser
warning	General warnings
ws	Web Intelligence