search for: 50ms

Hi, After some testing I've found out that my client's hardware recognizes DTMF only if digits are sent 50ms apart with 50ms of tone duration. This was tested using a test device which generates DTMF. Now asterisk doesn't do it by default because digits going out from Asterisk are not being recognized. Using command sendDTMF, I can control inter-digit duration, and using toneduration I can control d...

Hi all, I am trying to solve a tiny problem that is trivial to solve using dummynet (FreeBSD). I just want to add a delay of 50ms to each outgoing packet from an interface. This is to simulate a large pool of multiple modem users so I also need to add b/w limits etc (which seems to be easy to do). From the mailing list I could fine 2 qdiscs that can simulate latency : "delay" & "netem". Neither of the...

Hi, My laptop runs a local IMAP server so that I'm immune from breaking my mail client, and when playing around with powertop I discovered that Dovecot (in particular imap-login) wakes up every 1000ms and then every 50ms even when no clients are connected. A bit of stracing shows this: gettimeofday({1180875699, 667917}, NULL) = 0 <0.000010> poll([{fd=7, events=POLLIN|POLLPRI|POLLERR|POLLHUP|POLLNVAL}, {fd=10, events=POLLIN|POLLPRI|POLLERR|POLLHUP|POLLNVAL}, {fd=3, events=POLLIN|POLLPRI|POLLERR|POLLHUP|POLLN...

Salve, one year ago there was already a discussion about a version of Ogg Vorbis, with low delay enough for VoIP http://www.xiph.org/archives/vorbis/200108/0106.html >all transform codecs. They require a fairly large block of samples, i.e. in >Vorbis you need to input 3072 samples (or is it 4096) from each channel >before you can get any output. This could be reduced, trading off

Salve, one year ago here was already a discussion about a version of Ogg Vorbis, with low delay enough for VoIP http://www.xiph.org/archives/vorbis/200108/0106.html >all transform codecs. They require a fairly large block of samples, i.e. in >Vorbis you need to input 3072 samples (or is it 4096) from each channel >before you can get any output. This could be reduced, trading off

Does anyone know the default E&M Wink timings for Nortel DID ports? The default settings on Asterisk are: ; prewink: Pre-wink time (default 50ms) ; preflash: Pre-flash time (default 50ms) ; wink: Wink time (default 150ms) ; flash: Flash time (default 750ms) ; start: Start time (default 1500ms) ; rxwink: Receiver wink time (default 300ms) ; rxflash: Receiver flashtime (default 1250ms) ; deb...

Hi, I have a question regarding the Asterisk Packet Time for SIP Calls. It is hardcoded at 20ms but when I do an RTP Analysis on a stream it is clear that these packets are not spaced out at 20ms. In general you see something like: Packet 50 - Delay 50ms Packet 51 - Delay 5ms Packet 52 - Delay 5ms Packet 53 - Delay 50ms Packet 54 - Delay 5ms Packet 55 - Delay 5ms Is there anyway to space them out evenly at 20ms?? This is causing problems with the Sipura SPA2000 on our network. The SPA does not like this and is treating many packets as lost pack...

Hello, I was attempting to throttle egress traffic to a specific rate using a tbf. As a starting point I used an example from the LARTC howto, which goes: tc qdisc add dev eth1 root tbf rate 220kbit latency 50ms burst 1540 I then attempt a large fetch from another machine via wget (~40 megs) and the rate was clamped down to about 12Kbytes/s. As this seemed too much, I gradually increased the latency up to 200ms which then gave me the expected results (~34Kbytes/s). I then applied this queuing discipl...

Hello, I’ve read this Article avout VOIP and HFSC http://automatthias.wordpress.com/2006/06/30/hfsc-and-voip/ I’ve got few questions ? Considering this tc class add dev $DEV parent 1:1 classid 1:2 hfsc \ rt m1 ${UPLINK}kbit d 50ms m2 $[1*$UPLINK/10]kbit \ ls m1 ${UPLINK}kbit d 50ms m2 $[3*$UPLINK/10]kbit \ ul rate ${UPLINK}kbit rt = realtime curve ls = linksharing curve but m1 = ? m2 = ? d = dmax ? I’ve found this article too http://linux-ip.net/articles/hfsc.en/ And for example this line is quite diferent ! tc class ad...

Hi All, I read the advanced networking howto and find a useful way to shape my adsl link. is says: "tc qdisc add dev ppp0 root tbf rate 220kbit latency 50ms burst 1500 [...] Change 220kbit to your uplinks *actual* speed, minus a few percent. If you have a really fast modem, raise ''burst'' a bit. " My adsl''s upload brandwidth is about 120 kbits/sec, download brandwidth is about 384 kbits/sec. So I use tc qdisc add de...

I''m trying to fill a token bucket with enough tokens to burst several gigs of data. However, it doesn''t seem to get any higher than ~3.9GB: >tc qdisc add dev eth0 root tbf rate 1440kbit latency 50ms \ burst 16000000000 >tc qdisc show dev eth0 qdisc tbf 800b: rate 1440Kbit burst 3908420240b lat 2197.8s A smaller attempt of ~1.6 gigs works just fine: >tc qdisc add dev eth0 root tbf rate 1440kbit latency 50ms \ burst 160000000 >tc qdisc show qdisc tbf 800c: dev eth0 rate 1440Kb...

...orking at the moment. We have a 100Mbit connection to the internet, however we get charged for each mbit that we use and so have to shape/limit the traffic to avoid huge bills and my boss getting cross!! We have a /29 subnets set up as follows: tc qdisc add dev eth0 root tbf rate 0.8Mbit latency 50ms burst 10k tc qdisc add dev eth1 root tbf rate 0.6Mbit latency 50ms burst 10k |--------------| Internet (100Mbit) | | eth1 |---------| ------ Linux router ---------- Switch | eth0 | | .105 |---...

...delay packets, like this (assuming two remote locations): # create three bands, and place all default traffic in the first one: tc qdisc add dev eth0 root handle 1: \ prio bands 3 priomap 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 # the second and third bands of the prio above will delay packets # by 50ms for one simulated remote location, and by 70ms for the other: tc qdisc add dev eth0 parent 1:2 handle 20: netem delay 50ms tc qdisc add dev eth0 parent 1:3 handle 30: netem delay 70ms # use filters to place ''remote'' traffic into the appropriate band: tc filter add dev eth0 protoc...

Hi all, I tried last week to do traffic shaping on a production system, object of the exercise was simply to throttle the outgoing traffic. tc qdisc add dev eth4 root tbf rate 300mbit burst 300kb latency 50ms But the server became rather instable, crashing repeatedly without anything in the logs. Can anybody spot glaring mistakes in the tc command above, or tell me what I should have done instead? with kind regards, Bent Terp

...hrottling traffic to 5kbps If I throttle a PC''s traffic using the below when traffic exceeds 5kbps packets start getting dropped (as they should) but all traffic gets dropped. not just the bit over 5kbps. TC="tc add dev ppp0" $TC parent 8001:2 handle 2: tbf rate 5kbps latency 50ms burst 1540 I can see the "dropped" counter increasing, the overlimits counter stays the same and there is a "backlog" counter with 21p or similar each time which also stays the same. To get traffic working again I have to delete the qdisc and add it again. What am I doing w...

Hi, I have met the problem: when I use the shaping discipline tc qdisc add dev ppp0 parent 1:2 tbf latency 50ms burst 1450 rate 50kbit one of my application (namely, "aMule") starts leaving sockets in "CLOSING" state. These sockets accumulate and do not disappear. Eventually I have so many of these dead sockets that the kernel warns "Out of socket memory" in syslog (That happen...

Probably this is an old question, but i''m not able to find nothing about... So, i''ve just started to play with tc to limit the transfer speed to my hdsl connection. I''m using the tbf and the command # tc qdisc add dev eth0 root tbf rate 10kbit latency 50ms burst 1000 Then i''ve tried to transfer a big (20 Mbyte) file onto my lan, using ftp and the client (ncftp) is saying that the average transfer speed is 39.71 kB ( around 400 kbit). What i''m missing ? Thnaks in advance _______________________________________________ LARTC mai...

It''s not about scalability on a huge site, but the lowest possible latency for a very small app. I have a little app with Thin and Sinatra. My app generates the page in about 50ms. After getting the browser request, thin waits 50ms and then it takes 300ms sending the page, to Chromium at localhost. (It takes 300ms to send a static a.html with the word "test" on it, too, so it seems to be a lower bound on my machine) Why is that? Should Mongrel be faster sending t...

Does anyone know if sip phones from any of the major IP phone vendors support 802.1x authentication? Any feedback would be greatly appreciated. Thanks in advance. ====================== Jeronimo Romero EUS Networks Email: jromero at euscorp.com Cell: 917-332-7238 Office: 212-624-5943 Web: www.euscorp.com ====================== -------------- next part -------------- An HTML

...othing) when users enter passwords. But users expect all of their communication to be secret... not just their passwords! (There is no project called "SecurePasswordShell"!) I think Jason's approach is spot on: * keystrokes should be only sent at predetermined intervals (eg: every 50ms, or 20 times a second) * cover traffic at these fixed transmission times should be sent even if no keystroke is pressed. This can be turned off whenever a user is idle for 3 seconds. The security of Jason's proposal is clear: no information is leaked, except the timing of when the user start...