Re: wi problem with message > 7400 bytes

From: Lars Eggert (larse_at_ISI.EDU)
Date: 10/31/03

  • Next message: Daniel Eischen: "Re: wi problem with message > 7400 bytes" 
    Date: Thu, 30 Oct 2003 19:42:29 -0800
To: eischen@vigrid.com

    Daniel Eischen wrote:

    > Greetings,
    >
    > I'm having a problem receiving UDP messages over a wi interface:
    >
    > wi1: <Dell TrueMobile 1150 Series PC Card> at port 0x180-0x1bf irq 11 function 0 config 1 on pccard0
    > wi1: 802.11 address: 00:02:2d:4a:d8:7d
    > wi1: using Lucent Technologies, WaveLAN/IEEE
    > wi1: Lucent Firmware: Station (6.10.1)
    > wi1: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
    >
    > (wi0 is also a 'Dell TrueMobile 1150 Series PC Card' in
    > a mini-PCI card, but hangs the system when you try and
    > configure it -- so it obviously isn't configured in this
    > set up.)
    >
    > I have a small program that does a trivial UDP test:
    >
    > http://people.freebsd.org/~deischen/udptest.c
    >
    > My results show that:
    >
    > o Receiving large (> 7400 bytes) messages does not work.
    >
    > o Sending large messages works.
    >
    > o Sending & receiving large messages over a wired
    > interface (dc, fxp, etc) works.
    >
    > Am I suppose to be able to receive UDP messages larger
    > than 7400 bytes over the air?

    Could you post a tcpdump for each case? I wonder if this is related to a
    fragmentation issue I've seen in the past.

    Thanks,
    Lars 

    -- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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