Re: LARTC digest, Vol 1 #725 - 2 msgs

mikep02@xxxxxxxxxxxxxx · Mon, 19 Aug 2002 00:29:26 -0400

I will be out of the office from 8/19 until 8/23.  I will be returning on Monday
afternoon, 8/26, and will reply then.

Thank you,

Michael Pellegrino
Softerware, Inc.

___________________________________________________________________________
Subject: LARTC digest, Vol 1 #725 - 2 msgs
From: lartc@mailman.ds9a.nl
Date: 08/19/02 01:27:39

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Today's Topics:

   1. VoIP and QoS (Patrick Chan)
   2. Re: filter in-cache traffic  with tc (Alexey Talikov)

--__--__--

Message: 1
From: Patrick Chan <patrick_chan@mtelnet.com>
To: lartc@mailman.ds9a.nl
Date: Mon, 19 Aug 2002 10:01:18 +0800
Subject:  VoIP and QoS

This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.

------_=_NextPart_001_01C24724.4EFA3390
Content-Type: text/plain;
	charset="iso-8859-1"

There are two Linux routers, a 64K leased line is used
to connect these two machines. Now, we would like to run
Voice over IP between two machines. We have to run QoS and 
tag voice packet's TOS field,
otherwise, the voice quality is terrible if we transfer file
and make voice call at the same time.

I am not familiar with tc in Linux. But I have copied a script
from LARTC archives. If the following config is used, the situation
is better than nothing used. The voice packets can be tagged as 
TOS=0x21:

tc qdisc add dev hdlc0 parent 1:1 handle 2: pfifo limit 512
tc qdisc add dev hdlc0 parent 1:2 handle 3: pfifo limit 512
tc qdisc add dev hdlc0 parent 1:3 handle 4: pfifo limit 512
tc filter add dev hdlc0 parent 1:0 protocol ip prio 1 u32 divisor 1
tc filter add dev hdlc0 parent 1:0 prio 1 u32 match ip tos 0x21 0xff flowid
1:1

I don't know what it means exactly. But this is used, the voice quality
is bad at the beginning when file is transferred. The voice quality will
"converge" to be good after about 30 seconds.

However, this is not acceptable. Can anyone tell me what is the best
tc config for running VoIP? Thanks very much.

------_=_NextPart_001_01C24724.4EFA3390
Content-Type: text/html;
	charset="iso-8859-1"

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2653.12">
<TITLE>VoIP and QoS</TITLE>
</HEAD>
<BODY>

There are two Linux routers, a 64K leased line is used
 to connect these two machines. Now, we would like to run
 Voice over IP between two machines. We have to run QoS and 
 tag voice packet's TOS field,
 otherwise, the voice quality is terrible if we transfer file
 and make voice call at the same time.

I am not familiar with tc in Linux. But I have copied a script
 from LARTC archives. If the following config is used, the situation
 is better than nothing used. The voice packets can be tagged as 
 TOS=0x21:

<P><FONT SIZE=2>tc qdisc add dev hdlc0 parent 1:1 handle 2: pfifo limit 512</FONT>
<BR><FONT SIZE=2>tc qdisc add dev hdlc0 parent 1:2 handle 3: pfifo limit 512</FONT>
<BR><FONT SIZE=2>tc qdisc add dev hdlc0 parent 1:3 handle 4: pfifo limit 512</FONT>
<BR><FONT SIZE=2>tc filter add dev hdlc0 parent 1:0 protocol ip prio 1 u32 divisor 1</FONT>
<BR><FONT SIZE=2>tc filter add dev hdlc0 parent 1:0 prio 1 u32 match ip tos 0x21 0xff flowid 1:1</FONT>
</P>

I don't know what it means exactly. But this is used, the voice quality
 is bad at the beginning when file is transferred. The voice quality will
 &quot;converge&quot; to be good after about 30 seconds.

However, this is not acceptable. Can anyone tell me what is the best
 tc config for running VoIP? Thanks very much.

</BODY>
</HTML>
------_=_NextPart_001_01C24724.4EFA3390--

--__--__--

Message: 2
Date: Mon, 19 Aug 2002 09:05:12 +0500
From: Alexey Talikov <alexey_talikov@texlab.com.uz>
Reply-To: Alexey Talikov <alexey_talikov@texlab.com.uz>
Organization: Fortek
To: Fabian Gervan <fabian1@inter-k.com.ar>
Cc: lartc@mailman.ds9a.nl
Subject: Re:  filter in-cache traffic  with tc

Hello Fabian,
I recomend you use squid delay pools or WRR qdisc with patch for
squid.
see this links
http://wipl-wrr.sourceforge.net/
http://squid-docs.sourceforge.net/latest/html/x2116.html

Monday, August 19, 2002, 7:31:05 AM, you wrote:

FG> Hello lartc, I am using squid in transparent mode, and bandwith control
FG> with tc (htb). (redhat 7.3).
FG> Currently I mark packets comming from 3128 (squid
FG> port) to users, there are any way to filter the trafic if the object
FG> that user request alreay is in the squid cache (hit)?
FG> sorry for my english.

-----------------------------------
mailto:alexey_talikov@texlab.com.uz
BR
Alexey Talikov
FORTEK
-----------------------------------

--__--__--

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Re: LARTC digest, Vol 1 #725 - 2 msgs

Linux Advanced Routing and Traffic Control