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Metalshark
Asked: 2010-11-28 02:42:41 +0800 CST

Maximum Transmission Unit of VDSL

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A simple question (hopefully) but with no clear answers when doing a Google Search. What is the MTU of VDSL (not VDSL2)? With ADSL it was 1492, but most ISPs added PPPoE/PPPoA headers reducing it to 1452, is this still the same when it comes to other types of DSL (including VDSL)?

mtu dsl

1 Answers

  1. Best Answer

    You can check the MTU yourself using ping. Have a look at this page.

    For Linux:

    $ ping -c <packet_count> -M do -s <packet_size> <remote_ip>

    For Windows:

    ping -l <packet_size> -f <remote_ip>

    If you receive an error similar to this:

    Packet needs to be fragmented but DF set.

    Then, your MTU has been exceeded. You can try a smaller value until get a different response.

    You can check the PPPoE RFC. It says the maximum MTU is 1492 as you said.

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