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SHOREWALL-TCINTERFA(5) [FIXME: manual] SHOREWALL-TCINTERFA(5)
NAME
tcinterfaces - Shorewall file
SYNOPSIS
/etc/shorewall/tcinterfaces
DESCRIPTION
This file lists the interfaces that are subject to simple traffic shaping. Simple traffic shaping is enabled by setting TC_ENABLED=Simple
in shorewall.conf[1](5).
A note on the bandwidth definition used in this file:
o don't use a space between the integer value and the unit: 30kbit is valid while 30 kbit is not.
o you can use one of the following units:
kbps
Kilobytes per second.
mbps
Megabytes per second.
kbit
Kilobits per second.
mbit
Megabits per second.
bps or number
Bytes per second.
k or kb
Kilo bytes.
m or mb
Megabytes.
o 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).
INTERFACE
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.
Note
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) - {-|bandwidth[:burst]|~bandwidth[:interval:decay_interval]}
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
providers side.
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[2].
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
http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt for details.
OUT-BANDWIDTH (out_bandwidth) - [rate[:[burst][:[latency][:[peek][:[minburst]]]]]]
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).
FILES
/etc/shorewall/tcinterfaces.
SEE ALSO
http://ace-host.stuart.id.au/russell/files/tc/doc/sch_tbf.txt
http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt
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-rtrules(5), shorewall-routestopped(5), shorewall-rules(5),
shorewall.conf(5), shorewall-secmarks(5), shorewall-tcpri(5), shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5),
shorewall-zones(5)
NOTES
1. shorewall.conf
http://www.shorewall.net/manpages/shorewall.conf.html
2. Shorewall FAQ 97a
http://www.shorewall.net/FAQ.htm#faq97a
[FIXME: source] 06/28/2012 SHOREWALL-TCINTERFA(5)