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Questions tagged [qos]

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.

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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What is QoS and When to [not] use it?

As the title states! What is QoS When is it good to use it? When is it not good to use it?
squillman
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Attempting to shape traffic for both IPv4 and IPv6 results in a conflict

On my server I'm attempting to set up traffic shaping, and if I'm doing it for either IPv4 or IPv6, things are just fine: All filter rules for that particular protocol are installed. However, when attempting to shape both, I'm getting errors, and…
Robidu
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WLAN QoS setting: WMM vs SSID?

I've got a ZTE router which has Wireless LAN QoS setting WMM and SSID where SSID is the default. What should SSID mean here? See attached screenshot.
akostadinov
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Linux Traffic Control: How to prioritize traffic using bridge and qdisc?

I'm trying to prioritize traffic over the Linux-based software bridge in my network. When I generate traffic locally (on the machine hosting the bridge), the traffic is correctly prioritized. However, the "remote" traffic (from other nodes passing…
BigK
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ASA QoS for VoIP traffic

I'm looking to implement QoS for VoIP traffic using DSCP tags: EF & AF31. LLQ for VoIP: ciscoasa(config)# class-map cm_voip ciscoasa(config-cmap)# match dscp ef ciscoasa(config-cmap)# match dscp af31 ciscoasa(config)# policy-map…
Zell
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QOS with iptables and tc with unstable WAN

I have a router/gateway under Linux, I want to add some QoS to reserve bandwidth for a specific flow. This can be done with iptables/netfilter and tc, but all examples start from the fact that you know in advance the total bandwidth…
Benoit PHILIPPON
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QoS Traffic Shaping based on packet loss and latency for VPN

I am currently having the following situation: I am using a VPN (OpenVPN) over a rather unstable internet connection. This means the maximum bandwidth varies between 100kbs and 1mbit. Whenever the connection is rather unstable and there is high…
user2071301
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Rate limiting an internet connection per user

I've got a friend who has a "rent-by-room" property and includes internet access as part of this. However some tenants are somewhat hogging the internet (i.e. constantly downloading). I was wondering if anyone knows of a fairly easy way of rate…
Alister
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Do I need VLAN for VOIP phone if my network switches supports IEEE P802.1p QoS?

I have 30 workstation and 30 IP Phones all under one single network 192.168.9.0. The network switches is unmanaged switch but supports IEEE 802.1p QoS (e.g.: DLink DGS 1008D and DGS 1016D). I learned that it is better to split the data and voice…
Chau Chee Yang
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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 and if someone could give me a sample config that…
dryve
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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 that this qdisc schedule traffic using TOS 4…
MABC
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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 in priority. I added a rule on the trunk, here is…
frinux
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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 filter. For example, suppose we have 10 ports,…
Steve Peng
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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 seconds breaks between every 3 seconds transmission.…
kozooh
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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 that the switch gets overloaded easier than before…
Carl
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