Tagged Questions

Quality of service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow.

learn more… | top users | synonyms

2
votes
1answer
19 views

Traffic shaping outbound clients source ip with tc / iptables

My question is I am trying to limit a users bandwidth on a server and wondering the best way to do this. Before I dive to far into the tc/iptables I was wondering if I could get any advice on this ...
1
vote
1answer
287 views

QoS settings for Wi-Fi calling on pfSense firewall/gateway?

The new version of iOS 8 as well as Android supports Wi-Fi Calling with multiple cellular providers including T-Mobile in the US. I am currently running pfSense as the primary Internet gateway for ...
0
votes
0answers
29 views

stress testing a QOS switch

I need to test a network Switch that has QOS capabilities. I need to simulate a large network (preferably up to or exceeding 100 devices), and I need to do it as a live test. My requirements are: • ...
0
votes
0answers
58 views

Basic QoS configuration with PRIO qdisc is not working

Im using Ubuntu 12.10 OS and i want to prioritize ICMP traffic over other traffic in the egress queue of eth0 interface (as it is my default route to internet). By default this is the Qdisc ...
1
vote
1answer
113 views

Cisco Catalyst 3560 PoE 48 with setting interface to auto qos voip trust

All I'm trying to do is copy the running-config from a Cisco Catalyst 2560 PoE 24, to a Catalyst 3560 PoE 48. This is f0/1 from the original switch: interface FastEthernet0/1 switchport access vlan ...
0
votes
0answers
98 views

Simple Shorewall/netfilter traffic control/prioritization questions and possible strange side effects

I am setting up traffic prioritization for a small business to prioritize videoconferencing traffic over general web traffic. I use Shorewall (which controls iptables/netfiler) on a linux machine for ...
0
votes
1answer
110 views

RSVP on Cisco, Understanding and basic configuration

I'm looking for some help about a basic configuration and use of RSVP QoS into a Cisco router (2901 series). Since I have no luck using RSVP into my main network, I have tried to make it work in a ...
1
vote
1answer
126 views

qos with tc - high latency voip

I'm having following setup: local pbx doing calls for remote vpn clients. And have trouble with high latency a and quality of voip calls in remote office. Remote office is 10/10mbps link while local ...
1
vote
1answer
41 views

Qdisc pfifo_fast in linux and IP Precedence

Im using a embedded Linux distribution for a router system. My goal is to prioritize some traffic with minimum delay. I have a WAN interface with a default pfifo_fast qdisc attached to it. I have read ...
1
vote
0answers
34 views

QoS on GPRS connection

I have a question about QoS (Quality of Service) on GPRS connection. I have linux server with many connected clients through GPRS. Each of them communicates at the same time via ftp, http etc. How can ...
1
vote
1answer
155 views

QoS Degrading VOIP

I have the privilege of trying to optimize our network at work to help improve the quality of the voip system we have. The general setup is: Bandwidth is 18 Mbps down, 3 Mbps up. ~10 people in ...
1
vote
1answer
136 views

Do ISPs strip or modify QoS/DSCP headers to and from the edge?

If I mark a packet at a edge location with DSCP, does anyone know if ISPS (or in a general sense, middleboxes) strip or modify the DSCP header on UDP packets before they reach another edge location? ...
0
votes
1answer
237 views

Linux Traffic Shaping with “tc”: QoS filter for requests directly on the host not applied?

I'm trying to reduce the interface thoughput to debug my application on slower network speed. I've remembered a tc statement to do this on a interface which was working in the past. I used it on a ...
1
vote
0answers
23 views

How can I get QoS over a WDS bridge on Cisco WAP551

I have two Cisco WAP551 devices bridging two physical locations wirelessly across the street from each other (200 feet, line-of-sight through a window). This is replacing a much, much older wireless ...
0
votes
0answers
75 views

Layer 2 QoS for Windows Server 2012 service

We have an unmanaged Cisco SG102-24 switch which supports layer 2 QoS (IEEE 802.1p). Because we're installing VoIP at our office, we would like to prioritize VoIP packets from our voice server which ...
2
votes
1answer
238 views

Load balancing SDSL + ADSL with Zyxel USG-100

I have a Zyxel gateway/firewall, and two Internet connections : SDSL (4MB up, 4MB down) and ADSL (15MB down, 1MB up). I'm trying to configure my Zyxel to use the two connections, and to use the SDSL ...
0
votes
0answers
108 views

Limit concurrent connections in nginx across multiple servers

I am running a download service with free and paid premium membership types. The free membership should be restricted to one concurrent download. I know how to accomplish this when only one server ...
0
votes
0answers
86 views

Traffic Shaping Script Not Working

I wrote a script trying to use HTB algorithm to limit the throughput of specific ports, below is the script: tc qdisc add dev eth0 root handle 1: htb tc class add dev eth0 parent 1: classid 1:1 ...
1
vote
0answers
28 views

Is It Possible to Attach multiple Ports to a TC Filter?

I need to limit the bandwidth/rate by ports, and as a server there would be thousands of ports. Due to the limit of tc filter, I wonder if it is possible for multiple discreate ports to share a same ...
1
vote
1answer
45 views

How Many Filters Can We Have — LINUX QOS

I am doing Qos on Linux server using TC. According to the grammar of tc tool, the handle of a filter must be between 800::001 and 800::FFF. And because 0XFFF equals 4095 in decimal, so we can only ...
0
votes
1answer
267 views

Throttling individual samba connections

I have a CentOS server set up with Samba on a gigabit LAN connection. I've found that if I copy large amounts of data from the Samba server to a client machine that also has a gigabit connection, ...
1
vote
0answers
64 views

Why Parent Class In a TC Rules Tree Not Working

The parent class in my TC rules script doesn't work as it garanteed! Can somebody tell me what is wrong with my script? Here are some details about my question: From the chapter "9.5.4.4. Sample ...
1
vote
1answer
49 views

iptables filter by bridged interface

I try to make a QOS server using IMQ interface to monitor ingress. my setup : br0 | WAN <=> eth1 => IMQ1 <|> eth0 <=> LAN all go ...
0
votes
1answer
189 views

Why This TC Script Not Working

Our application has three classes of traffic, and every type of traffic involves three ports. We want to limit the traffic by port number via TC, so I made a simple TC script to have the test, however ...
3
votes
2answers
354 views

Linux qos: tc DRR qdisc does not work

There is tc queue discipline DRR(Dificite Round Robin) . It has same capabilities, as HTB, but instead of using buckets, filled with tokens, it just assignes every queue some Dificit Counter. On ...
0
votes
1answer
140 views

What do these two QOS script statements mean

I am studying the QOS utility of Linux -- TC -- recently, and today I encountered below two statments from a bandwidth-limit script on Linux: tc filter add dev eth0 parent 1: prio 1 protocol ip ...
1
vote
1answer
292 views

Can TC limit bandwidth by the Qos field of IP header

We are developing a client/server applications. There are three types of network data in our server app: Realtime data such as those of Video/audio, Critical Data such as those of Database data and ...
0
votes
1answer
390 views

What kernel module to compile for getting QOS service on Linux

We are developing on Linux system whose kernel had been compiled without QOS service years ago. Currently we want the QOS service back and plan to compile only the QOS-related kernel modules and ...
0
votes
1answer
92 views

Open the Linux QOS Service dynamically

We are developing a C++ application on Fedora (of kernel 2.6.9). This application will use the Linux TC utility to limit the bandwidth of specific applications by scanning their ports and setting ...
0
votes
2answers
80 views

Bandwidth Reservation vs QOS

what is the difference between bandwidth reservation and QOS? for example, if I reserve 30Mbps to VOIP traffic on a router, is that the same of QOS? or does QOS work in a different way?
3
votes
2answers
185 views

Can TC (Linux Qos Utility) limit bandwidth usage of target applications?

We have many applications running on the same server machine which is inside a network of servers. We want limit the bandwidth of our applications to specific value. So here are some choices: ...
-2
votes
1answer
51 views

Cisco QoS for telephony and videoconference traffic [closed]

I'm new in QoS and gathering information. I have switches 2960, 3750 and routers 2911, 7200 and I have voip and videoconference device/software in my network that I want to pass to Internet through ...
2
votes
3answers
1k views

VLANs using one managed switch or link router to unmanaged switches?

I'm the resident IT guy in an office with about 20 workers, amongst 3 separate companies who sublet an office. We are wired with 24 ethernet ports dotted around the offices that all lead to a patch ...
0
votes
1answer
112 views

Using Linux just for doing QOS on an existing network

I have a proprietary web filtering device which also functions as a NAT router. It's one interface has a public IP and another interface has a private IP. All local clients connect to the interface ...
0
votes
2answers
521 views

Is there any open source software for QoS (traffic control)? [closed]

We are doing QoS (traffic control) for our server application. This server provides file download service for users and we want to give different users different priority and bandwith. Suppose the ...
1
vote
0answers
145 views

Iperf multiple streams

I need to test my network between two sites using iperf. I'd like to open parallel streams sending data on different (let's say 5 defined) ports, with random length from 10-1000, with random 1-2 ...
17
votes
8answers
4k views

Mouse cursor jumps around when using RDP

We have over 350 users complaining that their mouse cursor keeps jumping around when typing. It seems like it's happening when the protocol is starved for bandwith, but I'm not quite sure yet. If it ...
0
votes
1answer
912 views

QoS on pfSense 2

I have a question about quality of service (QoS) on pfSense 2 I'm using pfSense 2 to load balance 2 internet line. I want to setup some rules let it work better for VoIP (Skype, x-lite), citrix, VPN, ...
0
votes
1answer
70 views

QoS - What is the 6. Bit in the DS-Field?

RFC 2474 uses the ToS byte for Differentiated Services Code Point: 0 1 2 3 4 5 6 7 +---+---+---+---+---+---+---+---+ | DSCP field |CU/ECN | ...
2
votes
1answer
150 views

Is there an effective way to monitor the load on each switch?

We have about 200 IP phones in our building and I realize we got more complaint about the phone quality after we switched our internet from 50Mbps to 200Mbps Up/Down. I know there's a possibility ...
1
vote
0answers
124 views

htb with an inner gred how to setup filter to reach DPs

I want to create a qos htb class and within this class there is a gred queue. how do I add a working filter for each red queue in the gred queue? what i tried was: DEV=lo SOMEGREDETTINGS="limit ...
1
vote
1answer
262 views

Limit OpenVPN bandwith

Is it possible to configure OpenVPN server to limit bandwidth use per user? Limiting either maximum speed (etc. to 100kb/s) or total downloaded/uploaded data per month is
1
vote
0answers
218 views

Slow network with 50Mb pipe, QOS to blame?

My network runs into intermittent slow downs every so often (enough to hurt employee productivity) Lately it seems to be much worse. I believe the QoS implementation from the network provider maybe ...
0
votes
1answer
500 views

How to view qos statistics on cisco 6500?

We have a 6504 switch with supervisor 720 10GE as core/distribution. We do marking at access level on 2960. I see drops on core. So I need to know about something like mls qos int stat, but on 6500. ...
2
votes
0answers
69 views

How to mark traffic from cpu on cisco 2960S

I am writing a QOS configuration. Does the way to mark trafic from cpu on 2960S exist? 2960S doesn't support service-policy output and vlan-based qos.
3
votes
0answers
112 views

IOS QOS service policy pass-through on a tunnel interface

I have some SIP phones on one network that go through an IPIP tunnel to get to the server. I've setup QOS rules to watch for appropriate VOIP traffic as follows: class-map match-any class-voice ...
0
votes
1answer
186 views

Cisco ASA 5540 multi-WAN and QoS setup

What is the best way to configure the following on a Cisco ASA 5540? I have 2 WAN lines, I need mail (tcp 25) on the one and all other traffic on the second WAN line. On the second WAN line I need ...
0
votes
1answer
56 views

MPLS: INBOUND vs OUTBOUND Labels

In The MPLS LSR if I have 4 INPUT ports with 4 labels label:port 11 : 1 22 : 2 33 : 3 44 : 4 and ONE output port How many labels can exit through the output port/interface? or do they get ...
0
votes
1answer
311 views

Is it possible to limit traffic received by a xen domU?

I have ubuntu 12.04 and openvswitch and xen installed, and I know that limit traffic sent by xen domU can be using rate limit by xen netback or "ingress_policing" by openvswitch. but because ...
2
votes
1answer
79 views

PIR/max-burst ignored message

After I typed the following police command for a type qos class on a Cisco Nexus 7000 switch: police cir 8 kbps pir 8 kbps I get the following message: Note: pir/max-burst ignored Can someone ...