similar to: how to change classful netem loss probability?

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Hi, I am using iproute2 to setup fowarding, adding routes like "ip route add 192.168.1.3 via 192.168.1.2" I was wondering where in the kernel I can insert probabilistic packet loss only for forwarded packets? So that for instance I can drop 5% of all forwarded packets? I don''t need help with the actual code, just need help finding where to insert this code :) Thanks! George

I''m trying to setup a netem delay with no luck (using iproute2-2.6.8, compilation broke during arpd compile, so I use the tc binary in the tc/ subdir, there''s also a q_netem.so there). kernel is 2.6.8.1, compile with CPU cycle counter as time reference. I was using sch_delay of 2.6.7 happily with something like: tc qdisc add dev eth0 root 1: delay latency 1ms rate 35M now I use:

Hi! We want to run TCP streams to several port numbers through one interface, each with a different delay set by Netem. E.g. TCP streams to port 80 could have 50ms delay, while TCP streams to port 81 could have 100 ms delay and so on. We have tried to solve this by using a combination of tc filter and netem rules, but we can''t get it quite right. We are considering one class per port,

I''m trying to use tc and netem to delay packets from several different machines as they exit via eth0. Assume two source IPs, 10.0.0.122 and 10.0.0.133. I''d like to delay packets from the first one by 200ms, and packets from the second one by 300 ms. Any other traffic should be sent out normally. Here''s what I tried: # make three classes, 1:1, 1:2, and 1:3: tc qdisc add

The following (occuring on debian/testing with kernel-image-2.6.8-2-386 version 2.6.8-13 and iproute version 20041019-3) confuses me: # tc qdisc add dev eth0 root handle 1: prio # tc filter add dev eth0 parent 1: proto ip pref 1 handle 1 fw classid 1:2 # tc filter ls dev eth0 filter parent 1: protocol ip pref 1 fw filter parent 1: protocol ip pref 1 fw handle 0x1 classid 1:2 # tc filter del dev

hi i tried the example given on the examples page to duplicate selected traffic like tc qdisc add dev eth0 root handle 1: prio tc qdisc add dev eth0 parent 1:3 handle 3: netem duplicate 40% tc filter add dev eth0 protocol ip parent 1:0 prio 3 u32 match ip dst 11.0.2.2 flowid 1:3 when i ping from 11.0.2.2 to this interface my machine hangs. the same thing works for drop or delay. i would

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

Hey, I am getting an invalid argument trying to insert a qdisc: [root@emu-5 iproute2]# tc qdisc add dev eth0 root xcp capacity 50Mbit limit 500 RTNETLINK answers: Invalid argument I''m not sure whats wrong here, because i can successfully insert this qdisc on other computers of mine. How can i debug this? Thanks! George

So, with the updated HAL, I'm now able to negotiate an IP address via DHCP over the WLAN. Huzzah! But I've got two questions (now that I can use the card): ath(4) doesn't contain a list of media nor mediaopt settings that can be used. Some are detailed down in EXAMPLES, but there's no comprehensive list. (As well, and this is minor, the speeds are explicitly listed for 802.11a

Hi, I am trying to install a proprietary qdisc made for research, it is not publically released yet, however its been used several times so i know it works. The files included are: q_xcp.c: static int xcp_parse_opt() static int xcp_print_opt() static int xcp_print_xstats() struct qdisc_util xcp_util = { "NULL", "xcp" ..... }; sch_xcp.c: static int

Hi Sam, do you know if there is anything done about cbb(4)? I have many wireless adapters with ath(4), but only the one based on PCMCIA is making problems on FreeBSD. I cannot boot my notebook with the device inserted into the port, or it will render the system unusable (100% load on cbb(4)). And all I can see is the following: Jul 12 14:58:39 link kernel: ath0: ath_chan_set: unable to reset

Thanks in advance! Summary: when I load netem and teql together, teql doesn''t work correctly. (If I load teql only, everything is fine) I loaded both netem and teql. Netem is associated with eth0, and teql is associated with both eth0 and eth1. But traffic only goes out of eth1. Attached are the commands that I used to configure teql and netem (on machine 1), and commands to

Hi, I am trying to control bandwidths of the connections by using TC with HTB. But I want to implement Leaky Bucket on this structure so as to have a straight flow. Due to being new in this area, could anyone help me how I could do this? Does TC support leaky bucket? Best regards, Fatih Duzova

Hi all, I am currently trying to emulate a satellite link, via Netem, on a testbed which is OSPF-enabled. I''d like to set up a Netem box between two routers. Since all routing between routers is dynamic, I''m wondering how to set up OSPF on my Netem box? Could someone indicate me if it is feasible and give me some guidelines to possibly do so? Thanks in advance, Vincent.

Hi, after some time without FreeBSD I installed 7.1 on an IBM Thinkpad T30 (with ZFS root on encrypted geli, works great). Config is: FreeBSD hasking.alashan.nongo 7.1-STABLE FreeBSD 7.1-STABLE #3: Thu Feb 5 21:10:45 CET 2009 root@hasking.alashan.nongo:/usr/obj/usr/src/sys/HASKING i386 I tried using my ath based D-Link DWL G650, which still seems to have some issues in regard to interrupt

Hi, I want to study the multi-path TCP behavior (single TCP connection over multi-paths), and I am setting up the test bed. I have two machines, each with two network cards. I have directly connected two eth0, and I am trying to figure out how connect two eth1 to control the properties of this connection, so that I can study the TCP on multiple different paths (different in terms of latency,

I have inheirited a samba-1.9.18p4 running on an alpha machine. I want to upgrade it to something newer. The machine serves a disk filled with network installs of our commercial software. I have tried installing both samba-2.0.7 and samba-2.2.0-alpha2, but both cause failures on the DOS machines. In specific, Corel WordPerfect 8 exits with an illegal instruction if a newer version of Samba is

I rebuilt my notebook that has the atheros card in it, and forgot to save all of my setup to get it working. I am using dkms and the madwifi rpms from rpmforge. My modprobe.conf has a line: alias wifi0 ath_pci I can ifconfig wifi0 up But the command: /usr/sbin/wpa_supplicant wpa_supplicant -dd -D madwifi -i wifi0 -c /etc/wpa_supplicant/wpa_supplicant.conf fails. Now some of my old

I seem to be able to lock my machine by going into wpa_cli and asking it to 'reassoc'. The reason for question mark after "hard" is that debug information (caused by wlandebug and athdebug) is being printed on the console. The only way to get machine's attention is to hold power button for 8 seconds. Note: manual reassociation is just the handy way to reproduce the problem