Ethereal-users: [Ethereal-users] Ethernet frame length

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From: jairo.morales01@xxxxxxxxxx
Date: Wed, 3 Aug 2005 15:18:57 -0500

I'm trying to connect an electronic board with a PC. This board contents a PIC 
microcontroller and a NIC (Network Interface Controller), this NIC is the 
RTL8019AS. I'm using a TCP/IP stack. The software running in the PC is an 
aplication made in Visual Basic 6.0. In this aplication I do the listen (using 
the Winsock tool) and I try to conect from the Board. I need the frames sent by 
the winsock and the board to be equal. When I capture the Ethernet frame sent 
by the boar (the ARP Request) I can see that ist length is 64 bytes (the 
standard length) but when I capture the frame sent by the PC its length is only 
42 bytes. Comparing the two frames I could see a diference, the 64 bytes one 
has an aditional field called "Trailer". Why aren't this frames equal if 
Ethernet is a standard? Could it be possible that the Ethereal is only showing 
me a part of the frame? (I haven't limited the capture frame length in 
Ethereal.)


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