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'TTL Adjust' parameter

Discussion in 'Tomato Firmware' started by detwsomerset, Apr 21, 2007.

  1. detwsomerset

    detwsomerset LI Guru Member

    Hi, I've tried searching the forums, but I don't seem to be able to find if this has been discussed before.

    I wanted to know if somebody can give me a technical explanation on what does the TTL adjust parameter in the Tomato firmware do. I know the TTL parameter is a counter that decrements itself once every time the tcp segment passes through a machine, and it is checked before retransmitting to see if it is bigger than zero. If it isn't, the packet is discarded.

    So, I wanted to know what happens when you set the TTL adjust parameter in Tomato to -3, for example. My ISP has recently seen fit to drastically put a limit to p2p traffic (right now, the connection tops at 20 KBps on bittorrent, while previously it was common to see a mean of 300 KBps), and somehow they need the ttl parameter to classify the packets as p2p traffic. Some guys have found out that adjusting the ttl to -3 in the tomato firmware, effectively ends with the limitation imposed by the ISP. So, I wanted to know how does this work and if it's gonna be implemented in any other firmware (sucks to have a linksys WRT54G v5...), for example dd-wrt.

    Thanks in advance!
     
  2. detwsomerset

    detwsomerset LI Guru Member

    Nobody? :sad:
     
  3. azeari

    azeari LI Guru Member

    i'm not sure how TTL affects p2p classification in this case. (= sry.

    though there are other ways of bypassing ur isps limit, i.e. encrypting traffic, and changing the default ports.
     
  4. detwsomerset

    detwsomerset LI Guru Member

    I've tried changing the default ports, but it doesn't matter :( As for encripting traffic, it'd be perfect, if most of the peers out there generated encripted traffic. But only a small minority do, so... I'm stuck with this :(

    Plus, they only implemented it recently (I've been with the same ISP for 7 years now, go figure). But I think if things continue to go this way, I'll have to switch to another one.

    Anyway, thanks, it seems I'm stuck with this :(
     
  5. roadkill

    roadkill Super Moderator Staff Member Member

    don't wait if they limit your online action - switch isp
     
  6. heffeque

    heffeque Network Guru Member

  7. detwsomerset

    detwsomerset LI Guru Member

    Wow, heffeque from bandaancha.st fame! :biggrin:

    Tio, voy a mandar a ono a tomar por donde amargan los pepinos, qué hartitos me tienen ya :frown:
     

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