[LARTC] fragment in CBQ?
Hi, All, Does any body know ifCBQ could do packet fragment? Or may be there is other tool in linux could do it? The reason I need to do it is that, I want to set up QoS using CBQ for voice packet, but too big TCP packet in the low priority queuewill cause intolerable jitter for the voice traffic since the outbound rate is only 64kbps. Regards, James
[LARTC] VoIP and CBQ
Hi, All, I did some work on QoS with CBQ. Basically, I wanted to separate VoIP traffic from other traffics and give it guarantied bandwidth. I used the following scripts to do the work, #!/bin/sh OPTION="allot 1514 maxburst 20 avpkt 1000" tc qdisc del dev eth0 root tc qdisc add dev eth0 root handle 10: cbq bandwidth 10mbit avpkt 1000 tc class add dev eth0 parent 10: classid 10:2 cbq bandwidth 10mbit rate 34kbit $OPTION prio 3 bounded tc class add dev eth0 parent 10:2 classid 10:10 cbq bandwidth 10mbit rate 30kbit $OPTION prio 3 tc class add dev eth0 parent 10:2 classid 10:20 cbq bandwidth 10mbit rate 4kbit $OPTION prio3tc filter add dev eth0 parent 10: protocol ip prio 3 u32 match ip tos 0x20 0xf0 flowid 10:2 tc filter add dev eth0 parent 10: protocol ip prio 3 u32 match ip dst 0/0 flowid 10:2 tc filter add dev eth0 parent 10:2 protocol ip prio 3 u32 match ip tos 0x20 0xf0 flowid 10:10 tc filter add dev eth0 parent 10:2 protocol ip prio 3 u32 match ip dst 0/0 flowid 10:20 It seemed working -- when therewas no VoIP traffic, a ftp link was using all 34kbit rate. When there was VoIP traffic, the ftp ratedropped to 17kbit (which was correct because the voice traffic was using 17kbit). Unfortunately, the voice quality was not good. Even if without ftp traffic, there were packets loss for voice traffic (ifyou count from 1 to 20 with one handset, you miss certain figures on the other end, they are 4, 5, 8, 9, 12, 13 etc). Any one had the same problem before? Any one can explain it? Any parameter I should adjust to better suit this application? Another thing I noticed was, when I changed the parameters for "allot" (ex 300) and "avpkt" (ex 500) in order to seekbetter setting for this application, the CBQstopped doing anything, so theratewas the NIC rate instead of 34kbit.I could change "maxburst" but it didn't improve the voice quality. Could any one tell me how to use these parameters? Thanks, James
[LARTC] my qos-cbq didn't work
Hi, All, I implemented the following qos scripts in my Linux gateway (redhat7.3, kernel 2.4.18),put ftp server (10.10.3.49) on one side (eth0 nic) and ftp client (10.10.5.3) on the other side (eth1 nic). I tried to up load a file (211kbytes) from client to ftp server. I wanted to see a 22kbps transmission rate. Quite surprise, the ftp client showed transmission rate as 6.8e+02 kbytes/s (211k transmitted in 0.3 seconds). It was the same as it without qos implementation. So the conclusion is the QoS was not working at all. Could anybody tell me what's wrong with the setting? Thanks, James #!/bin/sh OPTION="allot 1514 maxburst 20 avpkt 500" tc qdisc del dev eth0 root tc qdisc add dev eth0 root handle 10: cbq bandwidth 10mbit avpkt 500 tc class add dev eth0 parent 10:0 classid 10:2 cbq bandwidth 10mbit rate22kbps $OPTION prio 3 bounded tc qdisc add dev eth0 parent 10:2 handle 20: cbq bandwidth 10mbit allot 1514 avpkt 500 tc class add dev eth0 parent 20: classid 20:10 cbq bandwidth 10mbit rate 11kbps $OPTION prio 3 bounded tc class add dev eth0 parent 20: classid 20:20 cbq bandwidth 10mbit rate11kbps $OPTION prio3 bounded tc filter add dev eth0 parent 10: protocol ip prio 3 u32 match ip tos 0xa0 0xff flowid 10:2 tc filter add dev eth0 parent 10: protocol ip prio 3 u32 match ip src10.10.5.3/24 flowid 10:2 tc filter add dev eth0 parent 20: protocol ip prio 3 u32 match ip tos 0xa0 0xff flowid 20:10 tc filter add dev eth0 parent 20: protocol ip prio 3 u32 match ip src10.10.5.3/24 flowid 20:20
[LARTC] questions on CBQ
Hi, All, When I use CBQ, what should I put for "avpkt"? I saw all the examples using 1000, but if I have a lot of voice packets whichare very small,will "avpkt 1000" cause any problem? Another thing is, does CBQ support "default" as HTB does (ex: tc qdisc add dev eth0 root handle 1: htb default 12)? How can I put "all other traffic" into certain class? Thanks, James
[LARTC] redhat ready for htb?
Hi, All, I want to use linux (redhat) to do some bandwidth shaping work. I did know something on HTB and IPtables but I have very limited knowledge on Linux itself. I was told it's hard for non linux expert topatchthe kernel or even ptach HTB into IPROUTE2. So I would like to know if there is Redhat version with IPROUTE2 and HTB ready,then I don't need to do any patch work? Or if it's not available now,I knowkernel 2.4.20 hasHTB support, but how to patch HTB into IProute2? Thanks, James
[LARTC] questions with Stef's scripts
Hi, Stef, I have some questions withyour following scripts on www.docum.org, BW1=$1'kbps' BW2=`expr 100 - $1` BW2=$BW2'kbps' tc qdisc del dev eth0 root handle 1: tc qdisc add dev eth0 root handle 1: htb default 12 tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps burst 2k tc class add dev eth0 parent 1:1 classid 1:10 htb rate $BW1 ceil 100kbps burst 2k tc class add dev eth0 parent 1:1 classid 1:11 htb rate $BW2 ceil 100kbps burst 2k tc filter add dev eth0 parent 1: protocol ip prio 3 handle 1 fw classid 10:10 tc filter add dev eth0 parent 1: protocol ip prio 3 handle 2 fw classid 10:11 iptables -F iptables -X iptables -N acc_0 iptables -N acc_1 iptables -A OUTPUT -t mangle -p tcp --dport 2000 -j MARK --set-mark 1 iptables -A OUTPUT -t mangle -p tcp --dport 2001 -j MARK --set-mark 2 iptables -A OUTPUT -p tcp --dport 2000 -j acc_0 iptables -A OUTPUT -p tcp --dport 2001 -j acc_1 My questions are as follow,1.Why the classid in tc filter are "10:10 and 10:11" instead of "1:10 and 1:11"? How can you associate the filters with the classes you defined before?2.What does "fw" before "classid" in tc filter mean? Does it refer to forward chain?3.I guess the "handle 1" in tc filter refer to "mark1" in iptables, am I right? But is there any sequence problem to define handle 1 first and mark1 later in the scripts?4.Where can I find procedure on how to install HTB and compile kernel to use it?Your answer will be much appreciated,Regards,James
[LARTC] flowid and classid
Hi, All, Ihave aclass 1:10,it seems if Iusenetfilter mark as classifier, then the class will be refered as classid 1:10, however, if I use u32 as classifer, then the class should be refered as flowid 1:10, is it right? Thanks in advance, James
[LARTC] u32 and netfilter
Hi, All, My understanding is u32 filter is very powerful filter and could do anything aboutIP header filtering, then why do we sometimes use netfilering in IPtables? One advantege I guess is in netfilering, there is usage counter? Are there other advantges using netfilter (such as delay, flexibility)? What is the disadvantages to us Netfilter? In summary, what are the considerations to select u32 or netfilter as classifier for QoS? Thanks, James
[LARTC] HTB and IP tables
Hi, All, Does anyone have working scripts using HTB for QoS but IPtables for filtering? I want to learn how to put them together. Do the scripts working on Redhat? Thanks in advance, James
[LARTC] dynamic bandwidth in stef's scripts
Hi, All, I went through the HTB test section on www.docum.org. One thing I am very interested in is the scripts Stef was using: BW1=$1'kbps' BW2=`expr 100 - $1` BW2=$BW2'kbps' tc qdisc del dev eth0 root handle 1: tc qdisc add dev eth0 root handle 1: htb default 12 tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps burst 2k tc class add dev eth0 parent 1:1 classid 1:10 htb rate $BW1 ceil 100kbps burst 2k tc class add dev eth0 parent 1:1 classid 1:11 htb rate $BW2 ceil 100kbps burst 2k tc filter add dev eth0 parent 1: protocol ip prio 3 handle 1 fw classid 10:10 tc filter add dev eth0 parent 1: protocol ip prio 3 handle 2 fw classid 10:11 iptables -F iptables -X iptables -N acc_0 iptables -N acc_1 iptables -A OUTPUT -t mangle -p tcp --dport 2000 -j MARK --set-mark 1 iptables -A OUTPUT -t mangle -p tcp --dport 2001 -j MARK --set-mark 2 iptables -A OUTPUT -p tcp --dport 2000 -j acc_0 iptables -A OUTPUT -p tcp --dport 2001 -j acc_1 It seems we could dynamically change the bandwidth allocation between children. But can we use dynamic bandwidth for the parent? I mean can I use a variable to replace 100kbps in the parentqueue defination and change it whenever this script file is called? This way, the scripts will work with dynamic bandwidth environment, I can monitor the bandwidth I have currently, and give it to the scripts dynamically by calling the script file with the bandwidth parameter.Is this practical? Has anybody tried it before?James
[LARTC] A TOS QUESTION
Can anybody tell me what is "TOS=3D5"? I saw it several times in previous email. I would assume "3D" was added by the mail system automaticaly and means nothing here (so it should be "TOS=5"), am I right? Thanks, James
[LARTC] variable rate on wan connection
Dear all, I want to use IP route2 to do the QoS (VoIP, FTP, HTTP and Email). But the WAN connection rate is changing every 300ms, and it could be anywhere from 16kbps to 2mbps. Could IP route2 support it (I mean the total output of the queues will be updated every 300ms)? What is the requirement on the computer hardware? What issues I should consider? Thanks in advance, James
[LARTC] HTB with dynamic bandwidth
Hi, All, We want toimplement QoS in Linux gateway for different traffic,there are three types of trafficas below; 1.VoIP, total 34k, highest priority 2. HTTP, total 66k, medium priority 3. FTP, total 20k, low priority However, the bandwidth on the WAN side is dynamic, it could be any where from 34k to 120k. Can we use IPROUTE2to do it? How todo it, HTB? It there similar work has been down before? Thanks in advance, James
[LARTC] iptable for multiple ip address
Hi, All, So far, all the applications I have seen for Iptables are focusing on connecting aWAN with one IP address to a LAN and using NAT. My question is if the iptables support multiple IP address on WAN side? If so, how it works (you only have one NIC on WAN side)? Is static NAT (it might not be the right term, I mean a static and permanent connection between WAN IP address and LAN IP address) supported? Thanks in advance, James
