wi problem with message > 7400 bytes
Daniel Eischen
eischen at vigrid.com
Thu Oct 30 18:12:34 PST 2003
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?
To run the above test:
# On one machine, run it as a server (it just echoes
# the messages back to the client).
#
$ udptest -D
# On the wireless machine, run it as a client (it
# sends a message to the server and waits for the
# echoed response).
#
$ udptest -D -c -a <server's ip address> -m <message size>
If I set message size to 7392 (plus an 8 byte header
in my message = 7400), everything works. Anything
higher and I never receive the response.
Thanks
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