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.TH "firehol-tos" "5" "Built 30 Mar 2024" "FireHOL Reference" "3.1.7"
.hy
.SH NAME
.PP
firehol-tos - set the Type of Service (TOS) of packets
.SH SYNOPSIS
.PP
tos \f[I]value\f[R] \f[I]chain\f[R] [\f[I]rule-params\f[R]]
.SH DESCRIPTION
.PP
The \f[V]tos\f[R] helper command sets the Type of Service (TOS) field in
packet headers.
.RS
.PP
\f[B]Note\f[R]
.PP
There is also a \f[V]tos\f[R] parameter which allows matching TOS values
within individual rules (see firehol-params(5)).
.RE
.PP
The \f[I]value\f[R] can be an integer number (decimal or hexadecimal) or
one of the descriptive values accepted by iptables(8) (run
\f[V]iptables -j TOS --help\f[R] for a list).
.PP
The \f[I]chain\f[R] will be used to find traffic to mark.
It can be any of the iptables(8) built in chains belonging to the
\f[V]mangle\f[R] table.
The chain names are: INPUT, FORWARD, OUTPUT, PREROUTING and POSTROUTING.
These names are case-sensitive.
.PP
The \f[I]rule-params\f[R] define a set of rule parameters to match the
traffic that is to be marked within the chosen chain.
See firehol-params(5) for more details.
.PP
Any \f[V]tos\f[R] commands will affect all traffic matched.
They must be declared before the first \f[V]router\f[R] or
\f[V]interface\f[R].
.SH EXAMPLES
.IP
.nf
\f[C]

 # set TOS to 16, packets sent by the local machine
 tos 16 OUTPUT

 # set TOS to 0x10 (16), packets routed by the local machine
 tos 0x10 FORWARD

 # set TOS to Maximize-Throughput (8), packets routed by the local
 #              machine, destined for port TCP/25 of 198.51.100.1
 tos Maximize-Throughput FORWARD proto tcp dport 25 dst 198.51.100.1
\f[R]
.fi
.SH SEE ALSO
.IP \[bu] 2
firehol(1) - FireHOL program
.IP \[bu] 2
firehol.conf(5) - FireHOL configuration
.IP \[bu] 2
firehol-params(5) - optional rule parameters
.IP \[bu] 2
firehol-tosfix(5) - tosfix config helper
.IP \[bu] 2
iptables(8) (http://ipset.netfilter.org/iptables.man.html) -
administration tool for IPv4 firewalls
.IP \[bu] 2
ip6tables(8) (http://ipset.netfilter.org/ip6tables.man.html) -
administration tool for IPv6 firewalls
.IP \[bu] 2
FireHOL Website (http://firehol.org/)
.IP \[bu] 2
FireHOL Online PDF Manual (http://firehol.org/firehol-manual.pdf)
.IP \[bu] 2
FireHOL Online Documentation (http://firehol.org/documentation/)
.SH AUTHORS
FireHOL Team.