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Chapter 14 - Traffic Control
The Mark row determines how the mark value will be assigned for a packet or a
connection:
• The Set field determines whether the packet or the connection is assigned
the mark. The mark to field specifies the mark value for the rule and the /
field specifies the mask for the mark value (if the / field is empty, the
mark value will be the value set in the mark to field). The in field
specifies the chain in which the rule will be processed. Mark and mask
may be in the range 1..255 in decimal or hex.
• The Modify packet mark by field allows you to change the mark value by
an AND or OR value. The in field specifies the chain in which the rule
will be processed. The value may be in the range 1..255 in decimal or hex.
• The SAVE/RESTORE connection mark with mask field allows you to
save or restore the connection mark value with an assigned mask value.
The in field specifies the chain in which the rule will be processed. The
mask value may be in the range 1..255 in decimal or hex.
• The CONTINUE in field specifies that no more TC rules be checked if the
packet matches, and to forward the packet to the specified chain.
The Source field specifies the source IP address, subnet or MAC addresses to match.
Please refer to the chapter “Configuring The Firewall” for the formats of MAC and IP
addresses supported by Shorewall.
The Destination field specifies the destination IP address, subnet or MAC addresses
to match.
The Protocol field specifies the protocol (UDP, TCP, ICMP, etc) to match.
The Source Ports field specifies the source TCP or UDP port number or ICMP type
to match.
The Destination Ports field specifies the destination TCP or UDP port number or
ICMP type to match.
The Test field defines a test on the existing packet or connection mark. The packet or
the connection mark may be checked for equality or non-equality against a reference
mark. A mask may again be specified in the / field, to apply to both marks prior to
comparison. Mark and mask may be in the range 1..255 in decimal or hex.
The Length field specifies the packet length or length range to match.
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Figure 118: Edit TC Rule