====== Assigning priorities according to the protocols ======
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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:
<code>service fastdpi reload</code>
===== The file format of protocols and priorities list: =====

Each line contains the protocol name, then space, then dscp value. **For example:**
<code>
dns         0x3F
skype       drop
compressnet 010
ftp         keep
http        cs0
default     keep
</code>
<note important>[[en:dpi:dpi_options:opt_statistics:statistics_info|Full list of protocols.]]\\
DSCP value is specified as [[en:dpi:dpi_options:opt_priority:dscp_table|decimal, hex or octal number or as a text abbreviation]].</note> 

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

To move the settings into the work directory:
<code>mv protocols.dscp  /etc/dpi/protocols.dscp</code>

<note warning>Please use mv instruction! It is an atomic one. Do not use copy!</note>