I don't have any good input for your specific problem, but the dual Ethernet configuration was well tested in the past with the SAMA5Dx configurations.  Those boards have two Ethernet interfaces on board and no problems like your have been noted.

Most testing used apps/examples/bridge:

   $ find nuttx -name defconfig | xargs grep -l CONFIG_EXAMPLES_BRIDGE
   nuttx/boards/arm/sama5/sama5d3-xplained/configs/bridge/defconfig
   nuttx/boards/arm/sama5/sama5d4-ek/configs/bridge/defconfig

On 4/16/2021 6:50 AM, Вадим Ястребов wrote:
Hello everyone,

I have encountered a problem related to initializing 2 Ethernet interfaces on 
IMXRT1064 and I was wondering if you have any idea where to look for solutions.

Sometimes both interfaces work fine. Sometimes, when initializing the second interface with 
ifconfig followed by ifup, the first one dies about 10 seconds later. Sometimes the first one stops 
responding to ping and the debug output is showing me "ipv4_input: WARNING: Not destined for 
us; not forwardable... Dropping!" and "ipv4_input: WARNING: IP packet shorter than length 
in IP header"... Although, I am not very sure if this debug output is related to my problem. 
Maybe it's something else.... I still need to dig deeper into it!

Any suggestions will be greatly appreciated!

Best Regards,
Vadim Yastrebov


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