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From: | Keith Rubow |
Subject: | [lwip-users] Ethernet frames with extra padding bytes |
Date: | Thu, 3 May 2018 12:11:14 -0700 |
User-agent: | Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 |
The problem is that the Wiznet module seems to pad out all ethernet frames to a minimum length of 64 bytes. For example, a received ARP request is only 42 bytes long (confirmed my Wireshark), but the Wiznet module gives me a frame of 64 bytes. There are an extra 22 bytes appended to the end of the frame, and the extra bytes are not all zero.
LWIP does not seem to be working. Will these extra non-zero padding bytes cause problems with LWIP?
Note that a different Wiznet module padds out all frames to 60 bytes minimum, but is padding with all zero bytes. This module is working fine with LWIP.
Keith Rubow
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