DUMMYNET(4) BSD Kernel Interfaces Manual DUMMYNET(4)NAME
dummynet -- traffic shaper, bandwidth manager and delay emulator
DESCRIPTION
dummynet is a system facility that permits the control of traffic going through the various network interfaces, by applying bandwidth and
queue size limitations, implementing different scheduling and queue management policies, and emulating delays and losses.
The user interface for dummynet is implemented by the ipfw program, so the reader is referred to the ipfw(8) manpage for a complete descrip-
tion of the capabilities of dummynet and on how to use it.
KERNEL OPTIONS
The following options in the kernel configuration file are related to dummynet operation:
IPFIREWALL - enable ipfirewall (required for dummynet).
IPFIREWALL_VERBOSE - enable firewall output.
IPFIREWALL_VERBOSE_LIMIT - limit firewall output.
DUMMYNET - enable dummynet operation.
NMBCLUSTERS - set the amount of network packet buffers
HZ - sets the timer granularity
Generally, the following options are required:
options IPFIREWALL
options DUMMYNET
options HZ=1000 # strongly recommended
additionally, one may want to increase the number of mbuf clusters (used to store network packets) according to the sum of the bandwidth-
delay products and queue sizes of all configured pipes.
SEE ALSO setsockopt(2), bridge(4), ip(4), ipfw(8), sysctl(8)HISTORY
dummynet was initially implemented as a testing tool for TCP congestion control by Luigi Rizzo <luigi@iet.unipi.it>, as described on ACM Com-
puter Communication Review, Jan.97 issue. Later it has been then modified to work at the ip and bridging level, integrated with the IPFW
packet filter, and extended to support multiple queueing and scheduling policies.
Darwin October 28, 2002 Darwin
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DUMMYNET(4) BSD Kernel Interfaces Manual DUMMYNET(4)NAME
dummynet -- traffic shaper, bandwidth manager and delay emulator
DESCRIPTION
The dummynet system facility permits the control of traffic going through the various network interfaces, by applying bandwidth and queue
size limitations, implementing different scheduling and queue management policies, and emulating delays and losses.
The user interface for dummynet is implemented by the ipfw(8) utility, so please refer to the ipfw(8) manpage for a complete description of
the dummynet capabilities and how to use it.
Kernel Options
The following options in the kernel configuration file are related to dummynet operation:
IPFIREWALL enable ipfirewall (required for dummynet)
IPFIREWALL_VERBOSE enable firewall output
IPFIREWALL_VERBOSE_LIMIT limit firewall output
DUMMYNET enable dummynet operation
HZ set the timer granularity
Generally, the following options are required:
options IPFIREWALL
options DUMMYNET
options HZ=1000 # strongly recommended
Additionally, one may want to increase the number of mbuf clusters (used to store network packets) according to the sum of the bandwidth-
delay products and queue sizes of all configured pipes.
SEE ALSO setsockopt(2), if_bridge(4), ip(4), ipfw(8), sysctl(8)HISTORY
The dummynet facility was initially implemented as a testing tool for TCP congestion control by Luigi Rizzo <luigi@iet.unipi.it>, as
described on ACM Computer Communication Review, Jan.97 issue. Later it has been modified to work at the IP and bridging levels, integrated
with the ipfw(4) packet filter, and extended to support multiple queueing and scheduling policies.
BSD October 28, 2002 BSD
Work with FreeBSD with firewall ipfw + dummynet and I need to allow to some IP by MAC address and to deny to the others, since I can do it?
Thanks. (2 Replies)
Hi!
I've already posted this on the freebsd-questions mailing list, but I thought I could try it here too.
I'm using FreeBSD 7.0 with IPFW DUMMYNET enabled.
I've got a problem with creating a ruleset, which allows me to limit the overall bandwidth of a link and afterwards pass the packets... (0 Replies)
I am using dummynet in bridge mode. and its working fine.
Now I have built another box (freebsd 7.1) in router mode. On this box I have two NICs, one for lan and one for wan. both networks are segmented physically and logically i-e both interfaces have different ip pools and connected to... (0 Replies)
hi,
we have one unix server which sends multicast packets in the network, recently we have implemented firewall in between unix server and clients.After implementing firewall we found our lease line utilisation has been increased dramatically.
Is this because of firewall or else...please... (2 Replies)
Hi All,
I configured a bridged debian firewall using bridging utilities.
This works fine & I have been monitoring all users connecting to the internet & bandwidth usage.
There are 2 interfaces eth0 & eth1 which i have configured as bridged interface br0.
Today, I installed squid on the... (1 Reply)
Many papers, articles and posts about network bandwidth requirements refer to network traffic rules-of-thumb when estimating bandwidth requirements for a new network with an unknown load. I've seen a couple rules for video and VoIP.
I'd be thankful if someone could share any rules-of thumb they... (5 Replies)
Dear Engineer,
Can anyone please inform me some application name like (CBQ) to control network bandwidth and please provide me the url to configure it.
With Best Regards,
Md. Abdullah-Al Kauser (0 Replies)
Dear Engineer,
Can anyone please inform me some application name like (CBQ) to control network bandwidth and please provide me the url to configure it.
With Best Regards,
Md. Abdullah-Al Kauser (1 Reply)