The direction is defined by a number of an autonomous system that sends or receives the traffic. The direction priority specified for autonomous system (if defined) overrides the priority specified by protocol. The direction priority specified for the traffic's source (if defined) overrides the priority specified for the destination.

The direction dependent priorities assigned by the system's administrator, are loaded by DPI from the file /etc/dpi/asnum.dscp.

This file is created in two steps. First, the text file with a list of autonomous systems and their assigned priorities is created. Next, this file is converted into an internal format by a dedicated utility.

Each line of the file contains: AS_number <space> dscp_value. For example:

64512       cs0
64512       local
64513       drop
64514       pass
64514       peer

• Here cs0 - is DSCP value.
  

Keywords meaning:

• drop – means that packets have not to be transmitted: they must be dropped.
• pass – the traffic of this autonomous system must go through DPI with no analysis and processing.
• local – the traffic of this system is treated as a local operator's one, see BRAS L3
• peer – the operator is in peering state with this system; used only for Cache option
• term – termination is allowed for this AS; see BRAS: AS termination
• mark1 – Prioritize SNI detection in custom signatures for autonomous systems.
  Control from the cloud.
• mark2 – QUIC traffic without SNI from this AS will be marked as QUIC_UNKNOWN_MARKED
  Example:
  
  • in asnum.dscp ASN 15169 mark as mark2
  • in protocols.dscp mark QUIC_UNKNOWN_MARKED drop

To convert this file into the internal format and to place it into the working directory for DPI usage:

cat my_as_dscp.txt|as2dscp /etc/dpi/asnum.dscp
service fastdpi reload

To allow the transit of local operator traffic through the DPI without analysing and processing:

local_passthrough=1

To place the local operator traffic in a separate class:

local_dscp=0x38

dscp is set in a numerical form, the reference table provides correspondence between the numeric and letter symbols.

Autonomous system traffic within its class can be limited regardless of the basic service plan limitation.