[ES40-developers] FW: ES40 and TCPIP PING/SIZE=1785 failing (works up to 1784)

[Camiel V. <ca...@ca...>]

Hello developers,

Would any of you care to dive into this? Solving this problem might make the
ES40's networking functional at last.

Kind regards,

Camiel Vanderhoeven

-----Original Message-----
From: Volker Halle [mailto:Vol...@in...] 
To: Camiel Vanderhoeven
Subject: ES40 and TCPIP PING/SIZE=1785 failing (works up to 1784)

Camiel,

I wondered, why FTPing binary files did not work and tried a couple of PING
tests with the ES40 emulator. I seem to have stumbled over something:

If you use $ TCPIP PING/SIZE=n host to ping from the ES40 emulator to some
other node in the LAN by varying the ping packet size, everything works
fine, until you exceed n=1784. Then you can't get any successful ping
through !

If I look at an Ethereal packet trace for n=1784, I see one packet with 1514
bytes followed by another packet of 346 bytes on the wire.

For n=1785, I see the first packet with only 866 bytes, followed by a packet
of size 347, although the fragment offset for the 2nd packet correctly says
1480.

Trying to debug this should be much easier than trying to debug a hanging
FTP session...

Regards,

Volker Halle

 

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