shorewall-tcinterfaces 5 tcinterfaces Shorewall file /etc/shorewall/tcinterfaces 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(5). 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: 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. Only whole integers are allowed. The columns in the file are as follows. 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. 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 - [rate[:burst]] Optional. If specified, enables ingress policing on the interface. If incoming traffic exceeds the given rate, received packets are dropped randomly. With some DSL and Cable links, large queues can build up in the ISP's gateway router. While this insures maximum throughput, it kills interactive response time. By setting IN-BANDWIDTH, you can eliminate these queues. To pick an appropriate setting, we recommend that you start by setting it significantly below your measured download bandwidth (20% or so). While downloading, measure the ping response time from the firewall to the upstream router as you gradually increase the setting.The optimal setting is at the point beyond which the ping time increases sharply as you increase the setting. The burst option was added in Shorewall 4.4.13. If not supplied, 10kb is assumed. A larger burst size can help make the rate estimate more accurate on fast lines. The default burst often make the enforced rate mush less that the specified rate. 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). /etc/shorewall/tcinterfaces. shorewall(8), shorewall-accounting(5), shorewall-actions(5), shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(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-route_rules(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)