[lwip-users] DHCP INFORM coming from server rather than from client

[samyuktar]

I am using an ENC28J60 with a CC1352p1 and LWIP to set up a networking stack.
I am trying to assign my device an IP address using the DHCP protocol. I'm
able to send a DHCP DISCOVER message from my device (client with MAC address
74:69:69:2d:30:31) to the DHCP server (which is running on my PC with MAC
address b0:0c:d1:4c:15:5f):

DHCP DISCOVER: DHCP Discover
<http://lwip.100.n7.nabble.com/file/t2316/Screen_Shot_2020-01-03_at_3.png> 

I then get a DHCP OFFER from the server: It has the SRC MAC address of my
computer, DST MAC of my device, and assigns an IP of 192.168.1.100 to my
device. I can confirm that the device actually sees the OFFER packet as I
can see the contents of the packet in the code when I debug.

DHCP offer: 

<http://lwip.100.n7.nabble.com/file/t2316/Screen_Shot_2020-01-03_at_4.png> 

I can then see in Wireshark, a DHCP Inform. I assumed this meant that it was
requesting more information, but I thought DHCP Inform is supposed to come
from the client to server - in this case, from the device to my computer!
According to Wireshark though, the DHCP Inform is being broadcasted from the
server, i.e. my computer.

DHCP Inform : 

<http://lwip.100.n7.nabble.com/file/t2316/Screen_Shot_2020-01-03_at_4.png> 


Any ideas what could be going wrong?



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