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    MTU on 2304n

    This is a discussion on MTU on 2304n within the Sky Router forums, part of the Sky Broadband help category; I know the default MTU is 1500, but has anyone set a different size? When I was with TalkTalk their ...

    1. #1
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      MTU on 2304n

      I know the default MTU is 1500, but has anyone set a different size? When I was with TalkTalk their default was 1432 but I had mine at 1400 which worked alot better.
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      Re: MTU on 2304n

      The best MTU, other than 1500 would depend on the protocol you connect with. I wouldn't have a clue what the optimum setting on MER is. However, on a PPPoA encapsulated adsl connection 1478 should give the maximum throughput, because with the addition of the 10 bytes worth of trailers and headers required for the various layers of encapsulation, it exactly fits a whole number of atm cells.

      ATM cells are fixed length, each carrying a maximum of 48 bytes of data with any unused space filled with 1- 47 bytes of padding. A 1500 byte packet using PPPoA would be chopped up and fit in 32 ATM cells, with 26 bytes of padding in the last atm cell.


      I used to use PPPoA with an MTU of 1430 on AOL, which is the next best value for PPP over ATM, because AOL had a 1450 packet size limit. I have on a couple of occasions, that I can recall come across a website that wouldn't work with anything other than a 1500 mtu though, which was an issue with their servers.
      Last edited by fuzzy logic; 24-05-11 at 09:27 PM.

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      Re: MTU on 2304n

      Thanks for the info, just another question I have if you dont mind replying. I have set my wireless channel to 1 on the 2304n which has improved the range, but now I'm unable to connect on xbox live. All I get is a connection test failed and it prompting me to change my MTU to 1364?
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      Re: MTU on 2304n

      Changing the wireless channel shouldn't make any odds. However, given all the complaint about the stability of that router model on this forum, it wouldn't surprise me if there's an issue with mss clamping too (which is what the router should do if you've reduced the mtu). So, if you have your router set to a value other than 1500 at the moment, I'd suggest resetting the MTU to 1500 and rebooting the router, to see if that sorts it.

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      Re: MTU on 2304n

      mtu 1478 results in around 220kbps less downstream bandwidth
      on my easynet connection

      pppoa vc-mux
      Last edited by Shonk; 24-05-11 at 10:48 PM.

     

     

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