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Livebox and MTU

alexa -  
 pierre1000r -
Hello,

I have a livebox and 3 machines connected to it: a PC running XP, a PowerBook G4, and an iMac. The internet connection drops regularly and can be restored by rebooting the livebox. After checking the system, I think the problem comes from the MTU, and I would like to change it directly on the livebox instead of doing it on each machine. Does anyone know where to find that in the livebox interface?
Thanks in advance
Alex

7 answers

  1. topgun
     
    Hello,
    The livebox (at least my model, as there are 4 models of livebox) uses the PPoE protocol, which has a MTU of 1492.
    I saw on some forums that some used hidden pages from the livebox admin interface to force PPoA or bridge mode, depending on their needs... This is the only way to "modify" the MTU size. In PPoA, the MTU is 1500.
    8
  2. Space
     
    Hello,
    I don't have the same motivations as Alexa, but I'm also looking to change the MTU on my Livebox (in order to reduce my latency when gaming online).
    Does anyone know how to do that?
    5
  3. Sagitat
     
    LiveBox Xbox Live Port
    I just resolved the same issue for a friend (he apparently has a Livebox2, which is quite recent):
    It is indeed better to leave the firewall level of the Livebox on "Medium".
    And open the Xbox Live ports (UDP88, TCP&UDP3074, TCP&UDP53, and TCP80) in the NAT/PAT section of "Network".
    I want to clarify just in case that these ports need to be opened for the local IP address of your console (previously configured as static, e.g. 192.168.0.36).
    Which results in something like:
    Name: "Live3074" (for example) Protocol "Both" Incoming port: "3074" Destination port: "3074" IP address: "192.168.0.36" (for example)
    4
    1. Toto
       
      Port of destination, the same, not sure, try not to put anything or "any" or "all" instead.
      0
  4. brupala Posted messages 111142 Registration date   Status Member Last intervention   14 442
     
    Hi,
    why do you say it's due to an MTU setting?
    Do you even know what it is first?
    The MTU is the maximum size of a data packet on a transmission medium. It takes into account the medium itself and the encapsulation.
    http://www.commentcamarche.net/internet/protip.php3
    On Ethernet, the MTU is 1500 bytes, which results in a frame of 1518 bytes when adding MAC addresses and the rest of the encapsulation (CRC, type, etc.).
    It's the routers' job to adjust the MTU to the different networks they are directly connected to.
    It can therefore change from one link to another.

    --
    And... there you go!
    3
  6. arnaud
     
    Good evening, I had the following problem, unable to connect to Livebox 360 because of the MTU. I have the latest Livebox, and by lowering the firewall level from high to medium, it works.
    Maybe this is a lead?
    Best regards.
    1
    1. Ali
       
      Can you please tell me how to lower the firewall?
      0
    2. pierre1000r
       
      by going to the livebox menu 192.168.1.1
      0
  8. taymike
     
    bingo Arnaud, my problem was also the livebox firewall set to high, which was blocking my connection with xboxlive. Your solution worked for me, thank you very much.
    0