NAME

       firehol-dscp - set the DSCP field in the packet header

SYNOPSIS

       dscp { value | class classid } chain rule-params

DESCRIPTION

       The dscp helper command sets the DSCP field in the header of packets traffic, to allow QoS shaping.

              Note

              There  is  also  a  dscp  parameter which allows matching DSCP values within individual rules (see
              firehol-params(5)).

       Set value to a decimal or hexadecimal (0xnn) number to set an explicit DSCP value or use class classid to
       use an iptables(8) DiffServ class, such as EF, BE, CSxx or AFxx (see iptables -j DSCP --help for more in‐
       formation).

       The chain will be used to find traffic to mark.  It can be any of the iptables(8) built in chains belong‐
       ing to the mangle table.  The chain names are: INPUT, FORWARD, OUTPUT, PREROUTING and  POSTROUTING.   The
       names are case-sensitive.

       The rule-params define a set of rule parameters to match the traffic that is to be marked within the cho‐
       sen chain.  See firehol-params(5) for more details.

       Any  dscp commands will affect all traffic matched.  They must be declared before the first router or in‐
       terface.

EXAMPLES

               # set DSCP field to 32, packets sent by the local machine
               dscp 32 OUTPUT

               # set DSCP field to 32 (hex 20), packets routed by the local machine
               dscp 0x20 FORWARD

               # set DSCP to DiffServ class EF, packets routed by the local machine
               #              and destined for port TCP/25 of 198.51.100.1
               dscp class EF FORWARD proto tcp dport 25 dst 198.51.100.1

SEE ALSO

       • firehol(1) - FireHOL program

       • firehol.conf(5) - FireHOL configuration

       • firehol-params(5) - optional rule parameters

       • iptables(8) (http://ipset.netfilter.org/iptables.man.html) - administration tool for IPv4 firewalls

       • ip6tables(8) (http://ipset.netfilter.org/ip6tables.man.html) - administration tool for IPv6 firewalls

       • ip(8) - show / manipulate routing, devices, policy routing and tunnels

       • FireHOL Website (http://firehol.org/)

       • FireHOL Online PDF Manual (http://firehol.org/firehol-manual.pdf)

       • FireHOL Online Documentation (http://firehol.org/documentation/)

       • Linux Advanced Routing & Traffic Control HOWTO (http://lartc.org/howto/)

AUTHORS

       FireHOL Team.

FireHOL Reference                               Built 30 Mar 2024                                firehol-dscp(5)