---
name: "firehol-tosfix"
section: "5"
platform: "linux"
package: "firehol-doc"
version: "3.1.8+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/firehol-tosfix"
---

# firehol-tosfix(5)

apply suggested TOS values to packets

## NAME

firehol-tosfix - apply suggested TOS values to packets

## SYNOPSIS

tosfix

## DESCRIPTION

The `tosfix` helper command sets the Type of Service (TOS) field in packet headers based on the suggestions given by Erik Hensema in iptables and tc shaping tricks ⟨http://www.docum.org/docum.org/faq/cache/49.html⟩\\c .

The following TOS values are set:

- •

  All TCP ACK packets with length less than 128 bytes are assigned Minimize-Delay, while bigger ones are assigned Maximize-Throughput

- •

  All packets with TOS Minimize-Delay, that are bigger than 512 bytes are set to Maximize-Throughput, except for short bursts of 2 packets per second

The `tosfix` command must be used before the first router or interface.

## EXAMPLE

-

  ```
  tosfix
  ```

## SEE ALSO

- •

  [firehol(1)](/firehol/1.md) - FireHOL program

- •

  [firehol.conf(5)](/firehol.conf/5.md) - FireHOL configuration

- •

  [firehol-tos(5)](/firehol-tos/5.md) - tosfix config helper

- •

  [iptables(8)](/iptables/8.md) ⟨http://ipset.netfilter.org/iptables.man.html⟩\\c  - administration tool for IPv4 firewalls

- •

  [ip6tables(8)](/ip6tables/8.md) ⟨http://ipset.netfilter.org/ip6tables.man.html⟩\\c  - administration tool for IPv6 firewalls

- •

  FireHOL Website ⟨http://firehol.org/⟩\\c

- •

  FireHOL Online PDF Manual ⟨http://firehol.org/firehol-manual.pdf⟩\\c

- •

  FireHOL Online Documentation ⟨http://firehol.org/documentation/⟩\\c

## AUTHORS

FireHOL Team.