Dmitriy, you seem to have a non-working port and/or a non-working driver. FCS errors are not intentionally generated, so you can't correct them unless you know why they are there. So... I'll assume you mean those errored frames belong to the lwIP board. FCS should be correctly generated by a correctly initialized Ethernet chip; check your driver, check your cable. The delay between frames can be because of an RTOS task polling the chip instead of an interrupt driven rx framework. Check your port. The initial delay... if you connect two machines together without a hub/switch, one of them needs to reverse its function (unless you use a crossover cable), that might be both Ethernet chips trying to satisfy the other. A correctly configured chip shouldn't take long, but... check your driver, try with a switch or a crossover cable if you can't get a switch. In any case, you should step through your code to find some answers. Regards
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