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.

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Implement QoS/Bandwidth Management or Upgrade Bandwidth?

A question that I'm faced with currently. Here's my setup: Cisco ASA 5510 15Mbps Internet Connection @ $1350/month The bandwidth was originally meant for 35-45 people but we've grown quite quickly ...
8
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5answers
923 views

Blocking BitTorrent

How can one block, or severely slow down, BitTorrent and similar peer-to-peer (P2P) services on one's small office network? In searching Server Fault I wasn't able to find a question that served as a ...
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6answers
828 views

Hardware bandwidth limiter

Really not sure if this is the place to be asking this, but here goes.. Our company has grown exponentially in the last year. As such, our internet connection needs some serious managing and limiting ...
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5answers
831 views

QoS configuration for a medium ISP

What is the best Linux-based QoS platform to implement a configuration where all 256Kbps DSL clients (all belong to the same IP range) get a guaranteed speed of 200Kbps with single QoS rule?
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2answers
461 views

QoS on DD-WRT Questions

I have a question about quality of service (QoS) on linux (DDWRT specifically). Here's my setup: Recent version of DD-WRT 120 kbytes/s up and 2mbytes/down Traffic limited to about 80% of stated ...
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3answers
3k views

Making iptables recognize youtube streams and large files

I use Ubuntu server 10.04 with the stock kernel as a NAT router. I use iptables and tc to do port based traffic prioritization. It is working fine. I have given http higher priority. So my network ...
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1answer
836 views

What difference does the interface ATM0 bandwidth field on a Cisco 1417 router make?

I’m the chairman of the wiring committee for a hundred-unit condominium, and not a Cisco expert. We have a trio of Cisco Catalyst 3550 switches, connected to an old Cisco 1417 router, connected to a ...
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4answers
2k views

Bandwidth sharing via police exceed-action drop on Cisco Catalyst 3550s: anything less draconian?

I’m the chairman of the wiring committee for a hundred-unit condominium, and not a Cisco expert. We have a trio of Cisco Catalyst 3550 switches, connected to an old Cisco 1417 router, connected to a ...
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1answer
588 views

Rsync over NFS with QoS: How to view real transfer speed?

We have a bandwidth limit between a Linux server and a NAS, created using 'tc' with an IP filter. When writing to an NFS mount of the NAS, rsync claims a very high transfer speed for each file and ...
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1answer
173 views

More than 8 classes in a policy-map - Cisco 3560

It appears I am limited to 8 classes per policy-map. Here is the error message when using the Cisco Network Assistant: The policy "policy-name" contains more than 8 policers, which means it ...
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1answer
168 views

Multiple ACL on Cisco Catalyst with QoS classes - behaviour

I would like to limit the traffic to 2 Mbit for several IP addresses. With the following configuration, will each IP be limited to 2 Mbit or is it all IP addresses combined? Configuration: access-...
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0answers
403 views

unknown error when using TCMON/TCCOM to apply QoS DSCP marking on Windows 2003

I have a requirement to mark certain traffic originating from some Windows 2003 servers with a certain DSCP value. Unfortunately in this situation neither marking the traffic on a router or ...
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1answer
1k views

How to set dscp for incoming TCP connections to my server?

I need to specify dscp settings for the incoming TCP connections to my server. What is the easiest way to do that?
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2answers
198 views

QoS for Firebird database connections - how?

Our Firebird database connection goes through a network connection that seems to imply a high latency for normal TCP connections. However, I am quite sure that the network connection supports quality-...
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3answers
3k views

QOS on ubuntu server

I want to run the following script on ubuntu server. eth1 is NAT interface, and eth2 is the WAN interface which has a static public ip: TCA="tc class add dev eth2" TFA="tc filter add dev eth2" TQA="...
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2answers
2k views

Simple QoS policy on Cisco 877 DSL doesn't appear to do anything

I'm trying to get a fairly simple QoS policy up and running on my DSL line using a Cisco 877. My aims are fairly simple - make sure that realtime and management stuff like RTP and SSH works regardless ...
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2answers
1k views

how limit the number of open TCP streams from same IP to a local port?

i would like to limit the number of concurrent open TCP streams from the the same IP to the server's (local) port. Let's say 4 concurrent connections. How can this be done with ip tables? the ...
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2answers
1k views

Setup Cisco RVS4000 QOS for VOIP

Just switched from dedicated T1's with analog phone lines to cable modem with 10/2 uplink. We're having some VOIP call quality issues on the outgoing side when bandwidth is stressed and I need to ...
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2answers
863 views

Port based bandwidth shaping

I have an interent connection with the speed of 4000k bits up and down. I want to do port based traffic shaping on a ubuntu machine, which acts as router. eth0 is the WAN interface. This is how I ...
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3answers
226 views

Need reasonably priced router with QoS support [closed]

I dont need wireless. I am expecting very heavy traffic, with possibly thousands of tcp connections open at one time. This would require that the router has good hardware. I also need to limit the ...
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2answers
2k views

How to QoS NFS?

I have the following NFS-based storage setup: Computes nodes are Linux. The NFS servers are Solaris. A not-so-important user runs a bunch of read intensive jobs on a subset of the compute nodes. As ...
4
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1answer
2k views

Limit torrents via QoS on router

I have a very simple linksys router at home with basic support for QoS. We have a problem when everyone is at home that web browsing becomes unusable. I've tracked it down to too many people ...
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1answer
2k views

Router's QoS settings: are IP address subnet masks necessary?

Setting up my router's QoS settings, I can prioritize traffic according to a source IP address. However, alongside this, I'm also given the option of inputting that address' subnet mask. Is it ...
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1answer
1k views

Cisco ASA 5510 multiple time-range commands

I asked this question a while back, and have since discovered the "time-range" command in the ASA 5510. This works as expected. Is it possible to setup 2 sets of access-list rules that take effect ...
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4answers
3k views

Is there some advanced traffic shaping frontend for linux?

If you ever worked with Mikrotik routers, you probably got used to 'simple queuing', a very simply manageable list of IP->speed rules. I guess other router OSes have something similar, for those who ...
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1answer
798 views

Implementing QoS on a gateway box that runs Fedora [closed]

I configured a small factor PC to run as my gateway/file server/backup server/etc for my apartment. I want to implement QoS based on source IP address to prevent my roommates from bogging down my ...
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1answer
2k views

Cisco ASA 5510 Time of Day Based Policing

I have a Cisco ASA 5510 setup at a boarding school. I determined that many (most?) of the students were downloading files, watching movies, etc, during the day and this was causing the academic side ...
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1answer
713 views

Mediatemple (dv) kmemsize, privvmpages, tcpsndbuf QoS alerts [closed]

I'm on a (mt) (dv) base 3.5 server and am running ~20 small sites and I keep running into memory issues: cat /proc/user_beancounters Version: 2.5 ...
4
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1answer
1k views

How the big guys monitor their servers?

I'm wondering what software the web scale guys are using to monitor their n arrays of servers in the server farm(s). What does facebook, twitter, digg use? How google does it? I'm looking for a ...
2
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1answer
2k views

Traffic prioritization with Linux htb doesn't work, why?

I'm a Linux QoS newbie and I'm trying to learn how it works by using the docs at lartc.org as reference. My first goal is a modest one: I want to assign a higher priority to UDP outgoing traffic, but ...
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3answers
424 views

Distinguishing between types of P2P traffic on a Packet Shaper

I attend and work at a university where we have a packet shaper (an old Packeteer -- 3-ish years old or so) which relegates P2P traffic to the lowest priority in the queue in order to prevent P2P ...
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1answer
102 views

QoS in serviced offices

We recently have encountered a problem on our two shared lines provided by Regus in a serviced office. When there is download on either connection it renders the Internet unusable for anyone. I've ...
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2answers
1k views

Block Skype on Cisco IOS

I'm trying to block skype via policy routing but it's not working ... here's my configuration: class-map match-any block match protocol skype policy-map QoS-Priority-Input class block police ...
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4answers
2k views

Cisco IOS QoS prioritize SSH but not SCP

How can I prioritize ssh traffic to ensure low-latency but throttle SCP file transfers? I'm looking for a solution that is not host specific so I don't have to add lists of IP addresses. Thanks!
3
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2answers
1k views

QoS - split bandwidth across all IPs during high load

We have a Linux-based router which is currently working fairly well, but our network only has a 1.5 mbps incoming connection. The network is small, but during high load periods some systems can end up ...
3
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2answers
1k views

Cisco QoS Guidance

I have a 10M connection to the internet that is hooked into a 100M port. I am getting started with QoS, and am hopping for a little guidance on setting it up on a Cisco 3825 router. Right now I am ...
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2answers
10k views

QoS for Cisco Router to Prioritize Voice and Interactive Traffic

I have a Cisco 891W NATing Voice and Data to the internet over a 10mbit/2mbit connection. Voice traffic gets degraded when I upload large files. Pings time out as well. I tried to configure a QoS ...
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0answers
296 views

Troubleshooting iptables and configuring it to drop the priority of long-term connections

I'm somewhat familiar with the general concepts of iptables, and would like to learn it in more detail. I'm hoping that my learning experience can also be useful. The situation: I'm running dd-wrt ...
2
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1answer
709 views

Setting reply priority on Wifi network with QoS?

When using a Station and Access Point that support QoS over Wifi, is it possible to set the priority (= Traffic Identifier = TID = QoS channel) of the reply? For example when sending a ICMP ping ...
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2answers
788 views

QoS / PBR Routing Questions

I have a 50Mbs Satellite link and a 10Mbs Microwave link supplying a very remote location. Behind these links, I have a 6,400 seat network - with about 3,000 signed in at any one time. My goal is to ...
2
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4answers
983 views

MediaTemple tcpsndbuf QoS Alerts

I'm hosting with MediaTemple on a (dv) Dedicated-Virtual 3.5 server. My site consists of a Wordpress blog, some custom PHP pages (nothing too intense), and I server 500-700 unique visitors per day. ...
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4answers
7k views

Does anyone really understand how HFSC scheduling in Linux/BSD works?

I read the original SIGCOMM '97 PostScript paper about HFSC, it is very technically, but I understand the basic concept. Instead of giving a linear service curve (as with pretty much every other ...
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1answer
1k views

Sharing Bandwidth and Prioritizing Realtime Traffic via HTB, Which Scenario Works Better?

I would like to add some kind of traffic management to our Internet line. After reading a lot of documentation, I think HFSC is too complicated for me (I don't understand all the curves stuff, I'm ...
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2answers
143 views

How can I stop one virtual iis site from drowning out all the others?

I have about 20 IIS web sites on one Windows 2003 server. One of the websites is for downloading product updates. What methods/tools are available to me to ensure that the one does not kill the ...
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2answers
282 views

Validity of my basic Performance Testing Results on a LAN

Networking is not my main job and i am hoping you guys can comment on my test procedure so far to identify PCs best to host a few voip softphones. Our 100Mb LAN comprises of 40 Win XP/2000 PCs and a ...
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4answers
10k views

What are good and bad jitter times for a LAN

Ive just ran jperf (frontend to iperf) on our network between 2 workstations, its recorded jitter between 0.033ms and 0.048ms. Is this good or bad? Are there more variables that i would need to ...
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2answers
123 views

What switch spec would i need to support 50 SIP extensions

Were a call centre and thinking of moving our phone system to a voip based setup. It seems most advice advises keeping this network seperate from the standard LAN, what switch specification would be ...
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1answer
786 views

What free utility can I use to test LAN performance and quality?

I want to test a LAN for speed and reliability, I wanted to use qcheck but it won't instal on any of our XP systems. What other tool could I use? Is there anything with voip tests that is free? Does ...
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3answers
3k views

How do I use the `tc` command to give the 1st queue priority?

Lets say I have 3 queues (# indicates data): Q1: (in)[ ###](out) Q2: (in)[ #####](out) Q3: (in)[ #############](out) Lets say I put all my ICMP packets in Q1 and all the ...
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1answer
96 views

Load balancer + CPU load manager to handle SIP connections?

I no longer have a landline and subscribed to a VoIP provider to have a landline phone number. I prefer to use a softphone (EyeBeam, the commercial version of XLite), but there are times when a call ...