l2tp fragmentation prob

Discussion in 'Cisco' started by mac, Jul 11, 2003.

  1. mac

    mac Guest

    Hi,

    I'm work on a wap problem on a mobile network. There is a Lucent LAC
    tunnelling to a 2600 LNS. No problems are noticed until the wap device
    retrieves content that causes IP fragmentation at the LNS. Three
    packets are seen at the LAC - two encapsulated in the tunnel, the
    first 1500Byte packet containing most of the wml content, the second
    contains 5 bytes udp data which doesn't seem to be related to the
    first packet. The third packet is also a fragment but there is no
    l2tp/ppp/ip just eth/ip/udp, the source address is the lns and
    destination is the LAC, the data contained in this packet contains the
    rest of the content, but will never get to the device, because the
    l2tp-ppp-ip part is missing.

    any ideas..

    cheers
    mac
     
    mac, Jul 11, 2003
    #1
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  2. mac

    networkguy Guest

    I work for a major Telco that has the LAC responsibilities in the Ameritech
    region. We set our ip mtu @ 1600 between LAC & LNS. This would take of any
    fragmentation between LAC / LNS. You might give this a try, if you can get
    the other end to agree to change also.
     
    networkguy, Jul 12, 2003
    #2
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