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Questions About QoS

tscott_16
I need a little clarification on how to properly configure QoS.
I have two interfaces, Internal (eth0) and External (eth1).

What difference does it make which interface a bandwidth pool or throttling rule is bound to?

It seems that you could achieve throttling by setting an upper bandwidth limit in bandwidth pools. What's the difference?


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  • 0
    Bandwidth pools affect only traffic outbound from the interface; Download Throttling only affects traffic arriving at an interface.

    But, you're right in that the "old" way to create a Download Throttling rule on the External interface was to create a Bandwidth Pool on the Internal interface and set an upper limit to traffic coming from "Internet."  The "Download Throttling" concept is just easier to explain and makes WebAdmin more self-documenting.

    Cheers - Bob
  • 0
    When you say bandwidth pools only affect traffic outbound from the interface, does that mean "upload" traffic out to the internet or can that also include "download" traffic coming in, depending on the interface?

    Let's say I wanted to ensure at least 2Mbps for Netflix streaming coming into my media center PC. How does a bandwidth pool affect that traffic if that traffic is inbound?

    If I also wanted to limit bittorrent traffic, I would use an application throttling rule bound to which interface?

    I'm sorry I'm being slow to grasp the concept. If I understand correctly, the rule of thumb is bandwidth pools should bind to Internal interface and throttling rules should bind to external?
  • +1
    Ok, it finally occurred to me. I was visualizing eth0 and eth1 as each having an internal and external side since they are two physical interfaces. Instead, because they are using NAT masquerading, I needed to think of them as a single unit with just an internal facing side and an external facing side... the sides facing each other are transparent due to NAT masquerading (duh [:)] ).

    --------------------------------------------------------------------------------------

    Outbound Traffic (Upload):
    [LAN]>>>outgoing traffic to internet(inbound to internal interface)>>>[internal interface|NAT Masquerading|External Interface]>>>outgoing traffic to internet(outbound from external interface)>>>[Internet]

    Inbound Traffic (Download):
    [LAN][internal interface|NAT Masquerading|External Interface][Internet]

    Bandwidth pools only affect traffic outbound from the interface.
    Download throttling only affects traffic inbound to the interface.
    Therefore:

    To guarantee bandwidth for download traffic, bind bandwidth pool to the Internal interface.

    To guarantee bandwidth for upload traffic, bind bandwidth pool to the External interface.

    To throttle download traffic, bind throttling rule to the External interface.

    To throttle upload traffic, bind throttling rule to the Internal interface.

    --------------------------------------------------------------------------------------

    I hope this helps to clarify the concept for anyone else having trouble with this.