Wireshark-users: [Wireshark-users] Question regarding oversized frames
From: "Grant Mills" <[email protected]>
Date: Tue, 5 Sep 2006 14:07:57 -0700
I'm trying to view some packets generated by a SmartBits.

I generate a 1514 byte frame on the Smart Bits.  This goes out and
ethereal displays it.  The device on the other end, loops it back
(Swaps Src & Dest MAC & IP Addrs.)  The SmartBits capture tools
receives and displays the frame.  Wireshark does not display the
packet.  There is one slight modification to frame.  Due to a hardware
limitation on the DUT, the return frame is now 1516 bytes (not
including CRC.)  We're forced to use 4 byte alignment on our transmit.
So the returned frame is now over sized.  I have witnessed v0.10.7 of
Ethereal displaying frames of this size, but 0.10.10 does not.  I
tried WireShark 0.99.3 and it doesn't display the over sized frames
either.

I'm about to go research pcap/tcpdump to see if the problem lies there.

I really need to either configure Ethereal/WireShark/Pcap to display
these over sized frames or find a tool that does.

One last possibility is that the packets are getting dropped by the
driver or hardware.  If this were the case, can any body suggest a
method to test this?

Any help will be appreciated.  Thanks in advance.


--
Grant Mills
[email protected]