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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
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Generic actions in tc(8) Linux Generic actions in tc(8)
gact - generic action
tc ... action gact CONTROL [ RAND ] [ INDEX ]
CONTROL := { reclassify | drop | continue | pass | pipe |
goto chain CHAIN_INDEX |
jump JUMP_COUNT }
RAND := random RANDTYPE CONTROL VAL
RANDTYPE := { netrand | determ }
VAL := number not exceeding 10000
JUMP_COUNT := absolute jump from start of action list
INDEX := index value used
The gact action allows reclassify, dropping, passing, or accepting
packets. At the moment there are only two algorithms. One is
deterministic and the other uses internal kernel netrand.
random RANDTYPE CONTROL VAL
The probability of taking the action expressed in terms of
1 out of VAL packets.
CONTROL
Indicate how tc should proceed if the packet matches. For
a description of the possible CONTROL values, see
tc-actions(8).
Apply a rule on ingress to drop packets from a given source
address.
# tc filter add dev eth0 parent ffff: protocol ip prio 6 u32 match ip src 10.0.0.9/32 flowid 1:16 action drop
Allow 1 out 10 packets from source randomly using the netrand
generator
# tc filter add dev eth0 parent ffff: protocol ip prio 6 u32 match ip src 10.0.0.9/32 flowid 1:16 action drop random netrand ok 10
Deterministically accept every second packet
# tc filter add dev eth0 parent ffff: protocol ip prio 6 u32 match ip src 10.0.0.9/32 flowid 1:16 action drop random determ ok 2
tc(8), tc-actions(8), tc-u32(8)
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-08.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
iproute2 11 Jan 2023 Generic actions in tc(8)
Pages that refer to this page: tc(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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