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MTU-value - set wrong with "automatic"

Discussion in 'HyperWRT Firmware' started by loost74, Oct 16, 2004.

  1. loost74

    loost74 Network Guru Member

    Hi together,

    me and a lot of friends of mine having a Linksys WRT54G Router with HyperWRT 1.4 have the following problem:

    With the MTU-value set to "auto" some web-pages like ebay.de, spiegel.de and some others are not reachable.
    If you change the MTU-value to 1460 for example everything goes right.

    A friend of mine told me that the official firmware 2.04.4 has the same problmes - the problem does not occur with firmware 2.02.7 (I didn´t check this by myself)
  2. Toxic

    Toxic Administrator Staff Member

    the best way of testing it afaik is test it by pinging one site.

    ping www..... @ 1500 then lower mtu by 8

    1492, then 1484 then 1476 etc etc until the site is reachable.

    automatic only seems to work on cablemodems and not really adsl maybe it is a bug but best to set it manually if you have a problem with mtu
  3. bitonw

    bitonw Guest

    don't think so. many routers doesn't support the protocol used for auto mtu discovery or just block them (cisco). :idea:

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