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RL-TCPNet stack

Dear Keil
I'm using STM32F407VGT6 and LAN8720
Simple software without RTX

Please, see the DHCP full debug attached:

010.5 DHCP:*** Processing frame ***
010.5 DHCP: Initial check OK, proceeding
010.5 DHCP: Client state REQUESTING
010.5 DHCP: Received DHCP_ACK message
010.5 DHCP: IP Address: 192.168.1.16
010.5 DHCP: T1 timeout: 43200 sec
010.5 DHCP: T2 timeout: 75600 sec
010.5 DHCP: Lease time: 86400 sec
010.5 DHCP: Net mask  : 255.255.255.0
010.5 DHCP: Gateway   : 192.168.1.1
010.5 DHCP: Prim. DNS : 192.168.1.1
010.5 DHCP: Sec. DNS  : 8.8.4.4
010.5 DHCP: Next state BOUND

My device using DHCP received IP (192.168.1.16).
But ping on this address doesn't work.

What is the problem with stack?