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tcinterfaces - Shorewall file
This file lists the interfaces that are subject to simple traffic
shaping. Simple traffic shaping is enabled by setting TC_ENABLED=Simple
A note on the bandwidth definition used in this file:
· don't use a space between the integer value and the unit: 30kbit is
valid while 30 kbit is not.
· you can use one of the following units:
Kilobytes per second.
Megabytes per second.
Kilobits per second.
Megabits per second.
bps or number
Bytes per second.
k or kb
m or mb
· Only whole integers are allowed.
The columns in the file are as follows (where the column name is
followed by a different name in parentheses, the different name is used
in the alternate specification syntax).
The logical name of an interface. If you run both IPv4 and IPv6
Shorewall firewalls, a given interface should only be listed in one
of the two configurations.
TYPE - [external|internal]
Optional. If given specifies whether the interface is external
(facing toward the Internet) or internal (facing toward a local
network) and enables SFQ flow classification.
Simple traffic shaping is only useful on interfaces where
queuing occurs. As a consequence, internal interfaces seldom
benefit from simple traffic shaping. VPN interfaces are an
exception because the encapsulated packets are later
transferred over a slower external link.
IN-BANDWIDTH (in_bandwidth) -
The incoming bandwidth of that interface. Please note that you are
not able to do traffic shaping on incoming traffic, as the traffic
is already received before you could do so. But this allows you to
define the maximum traffic allowed for this interface in total, if
the rate is exceeded, the packets are dropped. You want this mainly
if you have a DSL or Cable connection to avoid queuing at your
If you don't want any traffic to be dropped, set this to a value to
zero in which case Shorewall will not create an ingress qdisc.Must
be set to zero if the REDIRECTED INTERFACES column is non-empty.
The optional burst option was added in Shorewall 4.4.18. The
default burst is 10kb. A larger burst can help make the bandwidth
more accurate; often for fast lines, the enforced rate is well
below the specified bandwidth.
What is described above creates a rate/burst policing filter.
Beginning with Shorewall 4.4.25, a rate-estimated policing filter
may be configured instead. Rate-estimated filters should be used
with ethernet adapters that have Generic Receive Offload enabled by
default. See Shorewall FAQ 97a.
To create a rate-estimated filter, precede the bandwidth with a
tilde ("~"). The optional interval and decay_interval determine how
often the rate is estimated and how many samples are retained for
estimating. Please see
OUT-BANDWIDTH (out_bandwidth) -
Added in Shorewall 4.4.13. The terms are defined in tc-tbf(8).
Shorewall provides defaults as follows:
burst - 10kb
latency - 200ms
The remaining options are defaulted by tc(8).
shorewall(8), shorewall-accounting(5), shorewall-actions(5),
shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5),
shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5),
shorewall-rules(5), shorewall.conf(5), shorewall-secmarks(5),
shorewall-tcpri(5), shorewall-tcrules(5), shorewall-tos(5),
2. Shorewall FAQ 97a
[FIXME: source] 12/13/2011 SHOREWALL-TCINTERFA(5)