Re: Pf que for voip
On 2006/02/02 11:33, Stuart Henderson wrote: > On 2006/02/02 22:08, [EMAIL PROTECTED] wrote: > > Quoting Graham Gower <[EMAIL PROTECTED]>: > > > This begs the question, what should you do if your bandwidth is variable? > > > > I've wondered that myself. I figured someone in that situation might > > have to settle for an upload bandwidth limited to the worst case? > > It's usually possible to monitor the router's reported connection speed > (maybe available by SNMP or logged to syslog, which might be easier than > connecting to the router's cli or web interface to retrieve the information) > and use the correct value in the ruleset. It shoulddn't be used "raw" as > ATM overheads need to be allowed for. A shell script and standard tools > should just about do the trick, though e.g. Perl is probably simpler. ...but catering for the worst-case results in quite inefficient use of the line: http://www.adsl-optimizer.dk/thesis/ has a lot more detail about this. One particular thing that stands out: TCP ACKs use a lot more of your line capacity than you're probably expecting.
Re: Pf que for voip
On Thursday 02 February 2006 04:20, you wrote: Greets > You'd have to manually tune it. There's no way for altq/pf to know what > speed "you get" on a given day/week/moment, it only knows about the > physcial speed (or whatever you set manually) for the interface. Absolutely correct regarding manual tuning. One of my clients is at the end of the line regarding attenuation (114) and signal over noise of 2, both extremely poor readings. Good is in the range of 40 and 15 respectively. Talk to you ISP and they should be able to give you those line condition readings without issue. I haven't found one that doesn't. The ADSL service package my client has is 2.5Mb D/L and 1 U/L, however, due to the poor line conditions the slightest issue anywhere in the network circuit causes voice dropoff among other things. They have G729 on the voip system which has reduced the traffic by a huge amount 80kb down to 8kb per conversation. Tuning the queue for all of these conditions of course is best guess and go from there, the next step for us is to drop the service package down to 1.5Mb and 640kb allowing a much lower stress level on the line making it much less prone to breakdown as there is no way to change the attenuation and signall over noise ratios. Get to know your ISP and I sure you'll find they can be helpful. ( be nice to them even if they are clearly inexperienced ). Do the math on the amount of bandwidth you actually need for your phone(s) Do the math on how much bandwidth your remaining services require ( or can at least get by on) Make an educated guess on the initial settings and go from there. Try to make sure you get those line readings as you can waste a LOT of time tracking down queue gremlins that don't exist ;-) Hope this helps Bob
Re: Pf que for voip
On 2006/02/02 22:08, [EMAIL PROTECTED] wrote: > Quoting Graham Gower <[EMAIL PROTECTED]>: > > This begs the question, what should you do if your bandwidth is variable? > > I've wondered that myself. I figured someone in that situation might > have to settle for an upload bandwidth limited to the worst case? It's usually possible to monitor the router's reported connection speed (maybe available by SNMP or logged to syslog, which might be easier than connecting to the router's cli or web interface to retrieve the information) and use the correct value in the ruleset. It shoulddn't be used "raw" as ATM overheads need to be allowed for. A shell script and standard tools should just about do the trick, though e.g. Perl is probably simpler.
Re: Pf que for voip
On Wed, 01 Feb 2006 23:45:24 +1030 Graham Gower <[EMAIL PROTECTED]> wrote: > This begs the question, what should you do if your bandwidth is variable? > > In my neck of the woods ADSL2 has been rolled out, which allows > theoretical 24000/1000 kbit/s. Of course, actual speeds depend on the > distance from the exchange. When the line resynchs, speeds change. One > day I might get 8000/900, another day its 7500/850. > > How do I tune altq for that? You'd have to manually tune it. There's no way for altq/pf to know what speed "you get" on a given day/week/moment, it only knows about the physcial speed (or whatever you set manually) for the interface. --- Lars Hansson
Re: Pf que for voip
Quoting Graham Gower <[EMAIL PROTECTED]>: Hi Graham, > This begs the question, what should you do if your bandwidth is variable? I've wondered that myself. I figured someone in that situation might have to settle for an upload bandwidth limited to the worst case? Shane This email was sent from Netspace Webmail: http://www.netspace.net.au
Re: Pf que for voip
[EMAIL PROTECTED] wrote: Before tinkering with queues, you might like to figure out your usable upload bandwidth to know what you're playing with. I would consider my VoIP altq rules a work in progress at the moment, but defining the upload bandwidths seem to be quite sensitive. I have ADSL PPPoA 1536/256 kbit/s and define my upload bandwidth as 212kbit/s and VoIP seems to be working great (quality at both ends). However if I define my upload bandwidth as 213kbit/s then it is as if I have just switched altq off. Setting it lower than 212kbit/s then gradually hurts download speeds (with pri of empty acks to minimize that problem coming second to VoIP). So it might be a good idea to know what you have to play with first. If you estimate too high, your VoIP queues are not going to be effective and you might waste lots of time trying to figure out why queues which should be working fine, are not. This begs the question, what should you do if your bandwidth is variable? In my neck of the woods ADSL2 has been rolled out, which allows theoretical 24000/1000 kbit/s. Of course, actual speeds depend on the distance from the exchange. When the line resynchs, speeds change. One day I might get 8000/900, another day its 7500/850. How do I tune altq for that? I suppose those on dialup have similar problems. Graham
Re: Pf que for voip
Hi Alex, Quoting Alex Stamatis <[EMAIL PROTECTED]>: > Now I need an advise from you who know it very well and especially the pf (i > am a total noob on pf). I bought a voip device today. And i want the router > no matter what the network usage is and packets to always give full priority > and the needed speed to 4 ports and a port range in 1 ip in order this > device can work properly because if I am on the phone and start a download > from another computer on the network the voip goes down Before tinkering with queues, you might like to figure out your usable upload bandwidth to know what you're playing with. I would consider my VoIP altq rules a work in progress at the moment, but defining the upload bandwidths seem to be quite sensitive. I have ADSL PPPoA 1536/256 kbit/s and define my upload bandwidth as 212kbit/s and VoIP seems to be working great (quality at both ends). However if I define my upload bandwidth as 213kbit/s then it is as if I have just switched altq off. Setting it lower than 212kbit/s then gradually hurts download speeds (with pri of empty acks to minimize that problem coming second to VoIP). So it might be a good idea to know what you have to play with first. If you estimate too high, your VoIP queues are not going to be effective and you might waste lots of time trying to figure out why queues which should be working fine, are not. Shane This email was sent from Netspace Webmail: http://www.netspace.net.au
Re: Pf que for voip
On Tue, Jan 31, 2006 at 08:06:04PM +0200, Alex Stamatis wrote: > Hello all. > > I am relatively new to openbsd. More than satisfied from the OS. From the > day I set it up to do my router and some more things it never annoyed me. > Even with some power failures etc the system kept working after booting > again just fine ! > > Now I need an advise from you who know it very well and especially the pf (i > am a total noob on pf). I bought a voip device today. And i want the router > no matter what the network usage is and packets to always give full priority > and the needed speed to 4 ports and a port range in 1 ip in order this > device can work properly because if I am on the phone and start a download > from another computer on the network the voip goes down ... The manual is > very big to read it and understand it in such a small amount of time I use > the system. As I told you I am a total newbie on OpenBSD. > Can you sugget to me some lines that will give full priority to these 4 > ports and 1 range which go into a specific lan ip ? > Thank you so much for your time. > > Best Regards > Alex Stamatis > > Hi Alex, rtfm ;) http://openbsd.org/faq/pf/queueing.html Tobias
Pf que for voip
Hello all. I am relatively new to openbsd. More than satisfied from the OS. From the day I set it up to do my router and some more things it never annoyed me. Even with some power failures etc the system kept working after booting again just fine ! Now I need an advise from you who know it very well and especially the pf (i am a total noob on pf). I bought a voip device today. And i want the router no matter what the network usage is and packets to always give full priority and the needed speed to 4 ports and a port range in 1 ip in order this device can work properly because if I am on the phone and start a download from another computer on the network the voip goes down ... The manual is very big to read it and understand it in such a small amount of time I use the system. As I told you I am a total newbie on OpenBSD. Can you sugget to me some lines that will give full priority to these 4 ports and 1 range which go into a specific lan ip ? Thank you so much for your time. Best Regards Alex Stamatis
