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    •  Stingray Service Gateway by VAS ExpertsDPITraffic prioritization depending on protocols and directionsAssigning priorities according to the protocols

    Table of Contents

    Assigning priorities according to the protocols

    The protocol priorities (assigned by system administrator) are loaded by DPI from the file /etc/dpi/protocols.dscp.

    This file is created in two steps: first one creates a text file with the list of protocols and their priorities. Second, it is converted into an internal format by a special utility.

    To apply the changes you need to the DPI configuration with the following command: 

    service fastdpi reload

    The file format of protocols and priorities list:

    Each line contains the protocol name, then space, then dscp value. For example: 

    dns         0x3F
skype       drop
compressnet 010
ftp         keep
http        cs0
default     keep
    Full list of protocols.
    DSCP value is specified as decimal, hex or octal number or as a text abbreviation.

    Keywords meaning:

    • drop - indicates that packets must not be transmitted further. They must be dropped.
    • keep - shows that priority must keep its current value (typically 0).
    • default - means "for all remaining protocols" and allows to simplify significantly making the configuration file.

    To convert into an internal format:

    cat my_dscp.txt|lst2dscp protocols.dscp
    [SSG v13+] in input files of the lst2dscp utility, it is now possible to add comments (#) and empty lines.

    To move the settings into the work directory: 

    mv protocols.dscp  /etc/dpi/protocols.dscp
    Please use mv instruction! It is an atomic one. Do not use copy!