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HTML rendering created 2024-06-26 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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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
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Checksum action in tc(8) Linux Checksum action in tc(8)
csum - checksum update action
tc ... action csum UPDATE
UPDATE := TARGET [ UPDATE ]
TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp |
SWEETS }
SWEETS := { and | or | + }
The csum action triggers checksum recalculation of specified
packet headers. It is commonly used to fix incorrect checksums
after the pedit action has modified the packet content.
TARGET Specify which headers to update: IPv4 header (ip4h), ICMP
header (icmp), IGMP header (igmp), TCP header (tcp), UDP
header (udp), UDPLite header (udplite) or SCTP header
(sctp).
SWEETS These are merely syntactic sugar and ignored internally.
The following performs stateless NAT for incoming packets from
192.0.2.100 to new destination 198.51.100.1. Assuming these are
UDP packets, both IP and UDP checksums have to be recalculated:
# tc qdisc add dev eth0 ingress handle ffff:
# tc filter add dev eth0 prio 1 protocol ip parent ffff: \
u32 match ip src 192.0.2.100/32 flowid :1 \
action pedit munge ip dst set 198.51.100.1 pipe \
csum ip and udp
tc(8), tc-pedit(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
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-11.) 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 [email protected]
iproute2 11 Jan 2015 Checksum action in tc(8)
Pages that refer to this page: tc-actions(8)
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HTML rendering created 2024-06-26 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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