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[Marco Wenzel]

Hi,

i've got a problem with the ToDevice element. The situation is as follows:

- receiving UDP packets with FromDevice
- strip the Ethernet header
- modify the IP header
- setting UDP and IP checksum
- encapsulate in ethernet header and send it to the network with ToDevice

This results in the following output (Print is placed in front of ToDevice):

udp_packet:   66 | ffffffff ffff0009 5b919367 08004500 00340000 40002211
4eb70a00 0003ffff ffff028e 028e0020 21130100 00010000 00d5c0a8 021e0000
00070a00 00020000 00d7
ToDevice(eth3) send: Message too long

The device is an WLAN PCMCIA card with the following configuration in ad-hoc
mode:

eth3      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:10.0.0.3  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

The error "Message too long" only occurs, when I try to send the modified UDP
packets. Every other packets are sent without any problems.
Has anyone an idea how to solve this problem? I don't know where I should search
for a mistake, because the packet generation seems to work correctly and as you
can see, the packet isn't too long to send it to the device.

Best regards,
Marco.

-- 
Dipl.-Ing. Marco Wenzel
Fachgebiet Kommunikationsnetze
Technische Universität Ilmenau
Tel.: +49 3677 69 1147
Raum: H2519
Web: http://www.tu-ilmenau.de/kn

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