Provided by: fireqos-doc_3.1.7+ds-3_all 
NAME
fireqos-class - traffic class definition
SYNOPSIS
{class|class4|class6|class46} [group] name [optional-class-params]
{class|class4|class6|class46} group end
DESCRIPTION
There is also an optional match parameter called class; see fireqos-params-match(5).
Writing class inherits the IPv4/IPv6 version from its enclosing interface (see fireqos-
interface(5)).
Writing class4 includes only IPv4 traffic in the class.
Writing class6 includes only IPv6 traffic in the class.
Writing class46 includes both IPv4 and IPv6 traffic in the class.
The actual traffic to be matched by a class is defined by adding matches. See fireqos-
match(5).
The sequence that classes appear in the configuration defines their priority. The first
class is the most important one. Unless otherwise limited it will get all available
bandwidth if it needs to.
The second class is less important than the first, the third is even less important than
the second, etc. The idea is very simple: just put the classes in the order of importance
to you.
Classes can have their priority assigned explicitly with the prio parameter. See fireqos-
params-class(5).
Note
The underlying Linux qdisc used by FireQOS, HTB, supports only 8 priorities, from 0
to 7. If you use more than 8 priorities, all after the 8th will get the same
priority (prio 7).
All classes in FireQOS share the interface bandwidth. However, every class has a
committed rate (the minimum guaranteed speed it will get if it needs to) and a ceiling
(the maximum rate this class can reach, provided there is capacity available and even if
there is spare).
Classes may be nested to any level by using the class group syntax.
By default FireQOS creates nested classes as classes directly attached to their parent
class. This way, nesting does not add any delays.
FireQOS can also emulate new hardware at the group class level. This may be needed, when
for example you have an ADSL router that you connect to via Ethernet: you want the LAN
traffic to be at Ethernet speed, but WAN traffic at ADSL speed with proper ADSL overheads
calculation.
To accomplish hardware emulation nesting, you add a linklayer definition (ethernet, adsl,
atm, etc.), or just an mtu to the group class. FireQOS will create a qdisc within the
class, where the linklayer parameters will be assigned and the child classes will be
attached to this qdisc. This adds some delay to the packets of the child classes, but
allows you to emulate new hardware. For linklayer options, see fireqos-params-class(5).
There is special class, called default. Default classes can be given explicitly in the
configuration file. If they are not found in the config, FireQOS will append one at the
end of each interface or class group.
PARAMETERS
group It is possible to nest classes by using a group. Grouped classes must be closed
with the class group end command. Class groups can be nested.
name This is a single-word name for this class and is used for displaying status
information.
optional-class-params
The set of optional class parameters to apply to this class.
The following optional class parameters are inherited from the interface the class
is in:
• ceil
• burst
• cburst
• quantum
• qdisc
If you define one of these at the interface level, then all classes within the
interface will get the value by default. These values can be overwritten by
defining the parameter on the class too. The same inheritance works on class
groups.
Optional class parameters not in the above list are not inherited from interfaces.
FireQOS will by default commit 1/100th of the parent bandwidth to each class. This
can be overwritten per class by adding a commit to the class, or adding a minrate
at the parent.
EXAMPLES
To create a nested class, called servers, containing http and smtp:
interface eth0 lan input rate 1Gbit
class voip commit 1Mbit
match udp ports 5060,10000:10100
class group servers commit 50% # define the parent class
match tcp # apply to all child classes
class mail commit 50% # 50% of parent ('servers')
match port 25 # matches within parent ('servers')
class web commit 50%
match port 80
class group end # end the group 'servers'
class streaming commit 30%
To create a nested class which emulates an ADSL modem:
interface eth0 lan output rate 1Gbit ethernet
class lan
match src 192.168.0.0/24 # LAN traffic
class group adsl rate 10Mbit ceil 10Mbit adsl remote pppoe-llc
match all # all non-lan traffic in this emulated hardware group
class voip # class within adsl
match udp port 5060
class web # class within adsl
match tcp port 80,443
class group end
SEE ALSO
• fireqos-params-class(5) - QOS class parameters
• fireqos(1) - FireQOS program
• fireqos.conf(5) - FireQOS configuration file
• fireqos-interface(5) - QOS interface definition
• fireqos-match(5) - QOS traffic match
• FireHOL Website (http://firehol.org/)
• FireQOS Online PDF Manual (http://firehol.org/fireqos-manual.pdf)
• FireQOS Online Documentation (http://firehol.org/documentation/)
AUTHORS
FireHOL Team.