similar to: Compiling sch_tbf.c in user space

hi, I am really a newbie in linux traffic control.But i have task to implement a tool similar to the nistnet tool used for netwok emulation tests but which emulates a wireless environment. I was exploring the use of the traffic control subsystem for this task.In this regard i have a few questions i need to post in order to clarify my thoughts on how to do this.I am using tcng to classify

Where can I find examples of configs to emulate WANs, I am looking for slow speeds and high latencies. Thanks

This patch updates the network emulation packet scheduler. * name changed from delay to netem since it does more than just delay * Catalin''s merged code to do packet reordering * uses a socket queue''s directly rather than layering on qdisc(fifo) because this is used in performance tests. * adds placeholder in API for future enhancements (rate and duplicate).

Hi all, I''m running some tests with netem and I noticed some strange behaviour that looks like a bug: I''m pinging another machine and adding delay with netem. When I tell netem to give me a 10ms delay, it works fine. The problem is that when I ask for a 11ms delay, it gives me 20ms! It happens for any value between 11ms an 20ms, and it repeats for values over 20ms, now

I''m a new comer. I have problems using tc+htb. I run the following commands, and expect outgoing ssh flow goes into 1:11. But actually it goes into default 12. What''s wrong? tc qdisc add dev eth0 root handle 1: htb default 12 tc class add dev eth0 parent 1: classid 1:1 htb rate 1000kbit ceil 2000kbit prio 1 tc class add dev eth0 parent 1:1 classid 1:11 htb rate 100kbit ceil

I forgot to ask a few more. Is there a relation between the hashtable ID /(parent,handle) so that if I used 2: for a hash table I could or couldn''t use 2: for a (parent,handle)ID? I also noticed that you type the hashtables like 2:2: can you have more levels with this? like 2:2:2:1: ? and I guess the same question with the parent/handles. thanks again. -- When dealing with a slow

Is it possible to create 1 filter rule using fw selectors AND u32 selectors? Richard. -- ___________________________________________________________________ Recursion: see recursion +------------------------------------------------------------------+ | Richard Lucassen, Utrecht | | Public key and email address: | |

Hello! This is the try number two. What was changed: - Added selectable choice in Kconfig file (thanks Jamal!) - Don''t abuse tc_u32_sel to not break backward compatibility (thanks Patrick!). Stephen, do you have any comments on iproute2 part? I know it''s not perfect but this is the best way, I think. "u32 match mark vvvv mmmm" it''s intuitive but breaks a

Can someone verify that using fw as a filter in iproute2-2.6.11-050330 is broken. Doesn''t seem to work in any case and I saw an earlier post that would lead me to believe this is the case. If so does anyone have a temporary fix? Thanks, Troy

I''m successfully using HTB + GRED to shape traffic based on the DSCP field. I would like to strip the DSCP and possibly replace it with normal ToS bits on egress traffic leaving my network. Leaving DSCP set is pointless, and could potentially cause problems with some ISPs that use DSCP internally I suppose. Setting ToS bits would seem ideal as most networks still honor it to varying

Hi all, Is there anyway to have more than 2 dummy interfaces? I need more of them but the system refuses to create it :P How can avoid this issue? Thanks. Luis Miguel Cruz. _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

Dear All, Would you guy have any advices concerning how to get some data like queue length, pkt size, and so forth, from the running queue. Right now, I modified the queue disc to print out some info I want using printk() and use syslogd to catch those info up. The problem is, in burst, syslogd can''t catch all the msg the queue sent out. Are there any standard or better way to

I''m looking for a way to configure a qdisc or filter to drop all packets. The logic behind this is that I''m using the u32 hashing tables to get move my filters from iptables to tc filters. This will translate into much less per-packet processing for me. However, I need a way to drop any packets that don''t match any of the filters. Paul C. Diem PCDiem@FoxValley.net

Hello! I am glad to announce a patch for u32 to allow matches on nfmark. The patch is non intrusive (few lines). Why I did this? Because fw classifier cannot be used together with u32. For example, now, you cannot match a mark of 0x90 and a destination port of 80. I know you can do it with iptables to do the marking, but if you use Jamal actions to apply mark to policed packets, you need

Okay, it''s been too long already, here is an update to iproute2 (ip, tc, ss, ...) utilities. Here is an updated snapshot. http://developer.osdl.org/dev/iproute2/download/iproute2-2.6.X-ss040701.tar.gz See the ChangeLog for detail but major changes are: * simple configuration (not autoconf) to deal with different systems * data rates in "tc" use communication standard

Hi, I''m interested to write rules direct in Kernel space memory and not to execute the tc command. Have anyone done this before ? Any ideas ? Sources ? Thank you, Liviu -- This message was scanned for spam and viruses by BitDefender. For more information please visit http://linux.bitdefender.com/ _______________________________________________ LARTC mailing list /

Hello, I am attempting to use the LARTC traffic control to simulate a radio link that has variable bandwidth and availability. The basic bandwidth could be as low as 500 bits/sec but will generally be about 4000 bits/sec. If the simulated radio link is unavailable (zero bandwidth) then packets should be queued until a link is re-established. i.e. Initial bandwidth is 5000bits/sec then to 0

Hi, I am using netem to add loss and then adding another qdisc within netem according to the wiki. Then i want to change the netem drop probability without having to delete the qdisc and recreate it. I try it but I get invalid argument: thorium-ini hedpe # tc qdisc add dev ath0 root handle 1:0 netem drop 1% thorium-ini hedpe # tc qdisc add dev ath0 parent 1:1 handle 10: xcp capacity 54Mbit

There is an design problem with the qdisc interface that causes qlen related bugs in netem, tbf, and other qdisc''s that peek at the top of the queue. The problem is that requeue needs to be called from the dequeue function but requeue can fail. If requeue fails, then the calling qdisc can not properly handle the error. If it returns NULL, then the parent''s expectation about qlen

Hi, in a project i must degrade the voip/video, i know to do latency (tbf), but i don''t know how to create jitter. I want to do it on a router/bridge and not the generating equipment. Any have a idea, or know a piece of code that do it? Thanks Ciprian