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Inbound layer7

Discussion in 'Tomato Firmware' started by chadrew, Oct 29, 2007.

  1. chadrew

    chadrew LI Guru Member

    What is inbound layer7 option? Do I disable it or enable it?
    I'm asking because I found that one topic where a person has disabled it, I was wondering for what reasons.
  2. azeari

    azeari LI Guru Member

    layer7 is the application level filter. it allows for identification of packet information (i.e. this packet belongs to msn, or bittorrent) based on a set of rules and filters. the typical use is for qos prioritisation of traffic.

    personally i haven't found much use for layer7 cuz i tend to separate my traffic using the port-based filter. the down side of layer7 is the high cpu usage if you have lots of traffic or many rules specified
  3. chadrew

    chadrew LI Guru Member

    Hm, yes. I knew what layer7 was in general terms. But inbound? Does it only work for inbound (download) traffic? I heard download traffic can't be prioritized because you can't control how server sends you info :confused:

    P.S. I use it for Skype since it's hard to prioritize it with ports.
  4. der_Kief

    der_Kief Super Moderator Staff Member Member


    inbound QoS is not a really good idea. Here are some quotes out of this thread:

    ...What does the router do with all of the packets that do arrive that go over their inbound QoS bandwidth allocation or get "squeezed" out by a higer class of inbound QoS? The answer: inbound QoS means dropping packets. And the other side, in the case of TCP, will dutifully resend the packet again, after figuring out that some didn't make it. So you get more packets for the router that might not be delivered to the destination...

    ...Regardless, "incoming QoS" is not QoS. It is throttling. And it happens only after the packets are already in your fast router and have traversed the bottleneck...

  5. chadrew

    chadrew LI Guru Member

    Thank you for your answer. What interests me is inbound layer7 only works for l7 filters, right (doesn't affect QoS set by ports)? I think I will disable it then since the only l7 filter is for skype.

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