CubeMX and LwIP : DHCP packet is sent, but something is wrong

[bully]

Hello,

I'm trying to get DHCP working as an initial step in using LwIP. Have generated project with CubeMX and now I'm catching the problem.

Using Wireshark, I can see that DHCP Discover packet is sent, but no response is received. IT seems that something is wrong with the packet. As a reference, I also captured DHCP packet from my laptop that does work and gets response.

Any advice what is wrong ?

Thanks in advance,

regards,

Rob.

Packet from STM32F439 :

No.     Time           Source                Destination           Protocol Length Info
   3006 49.570106      0.0.0.0               255.255.255.255       DHCP     350    DHCP Discover - Transaction ID 0x5851f42d
 
Frame 3006: 350 bytes on wire (2800 bits), 350 bytes captured (2800 bits) on interface 0
    Interface id: 0 (\Device\NPF_{A7ACDF3A-ED3E-4FAD-B7B4-533C6D411BF2})
    Encapsulation type: Ethernet (1)
    Arrival Time: May  1, 2019 10:37:34.873435000 Srednjeevropski poletni �?as  
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1556699854.873435000 seconds
    [Time delta from previous captured frame: 0.075670000 seconds]
    [Time delta from previous displayed frame: 11.888756000 seconds]
    [Time since reference or first frame: 49.570106000 seconds]
    Frame Number: 3006
    Frame Length: 350 bytes (2800 bits)
    Capture Length: 350 bytes (2800 bits)
    [Frame is marked: True]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:udp:dhcp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Stmicroe_00:00:00 (00:80:e1:00:00:00), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
    Source: Stmicroe_00:00:00 (00:80:e1:00:00:00)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 0.0.0.0, Dst: 255.255.255.255
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
    Total Length: 336
    Identification: 0x0001 (1)
    Flags: 0x0000
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0xba9c [validation disabled]
    [Header checksum status: Unverified]
    Source: 0.0.0.0
    Destination: 255.255.255.255
User Datagram Protocol, Src Port: 68, Dst Port: 67
    Source Port: 68
    Destination Port: 67
    Length: 316
    Checksum: 0xf773 [unverified]
    [Checksum Status: Unverified]
    [Stream index: 8]
    [Timestamps]
Dynamic Host Configuration Protocol (Discover)
    Message type: Boot Request (1)
    Hardware type: Ethernet (0x01)
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x5851f42d
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
    Client IP address: 0.0.0.0
    Your (client) IP address: 0.0.0.0
    Next server IP address: 0.0.0.0
    Relay agent IP address: 0.0.0.0
    Client MAC address: Stmicroe_00:00:00 (00:80:e1:00:00:00)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (53) DHCP Message Type (Discover)
        Length: 1
        DHCP: Discover (1)
    Option: (57) Maximum DHCP Message Size
        Length: 2
        Maximum DHCP Message Size: 1500
    Option: (55) Parameter Request List
        Length: 3
        Parameter Request List Item: (1) Subnet Mask
        Parameter Request List Item: (3) Router
        Parameter Request List Item: (28) Broadcast Address
    Option: (255) End
        Option End: 255
    Padding: 000000000000000000000000000000000000000000000000…

and working DHCP packet from laptop (and DHCP offer it gets as a response) :

No.     Time           Source                Destination           Protocol Length Info
    280 37.678948      0.0.0.0               255.255.255.255       DHCP     351    DHCP Discover - Transaction ID 0xac96b414
 
Frame 280: 351 bytes on wire (2808 bits), 351 bytes captured (2808 bits) on interface 0
    Interface id: 0 (\Device\NPF_{A7ACDF3A-ED3E-4FAD-B7B4-533C6D411BF2})
    Encapsulation type: Ethernet (1)
    Arrival Time: May  1, 2019 10:37:22.982277000 Srednjeevropski poletni �?as  
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1556699842.982277000 seconds
    [Time delta from previous captured frame: 0.235728000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 37.678948000 seconds]
    Frame Number: 280
    Frame Length: 351 bytes (2808 bits)
    Capture Length: 351 bytes (2808 bits)
    [Frame is marked: True]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:udp:dhcp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Pegatron_bb:30:10 (0c:54:a5:bb:30:10), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
    Source: Pegatron_bb:30:10 (0c:54:a5:bb:30:10)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 0.0.0.0, Dst: 255.255.255.255
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
    Total Length: 337
    Identification: 0x62af (25263)
    Flags: 0x0000
    Time to live: 128
    Protocol: UDP (17)
    Header checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source: 0.0.0.0
    Destination: 255.255.255.255
User Datagram Protocol, Src Port: 68, Dst Port: 67
    Source Port: 68
    Destination Port: 67
    Length: 317
    Checksum: 0xa8e9 [unverified]
    [Checksum Status: Unverified]
    [Stream index: 8]
    [Timestamps]
Dynamic Host Configuration Protocol (Discover)
    Message type: Boot Request (1)
    Hardware type: Ethernet (0x01)
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0xac96b414
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
    Client IP address: 0.0.0.0
    Your (client) IP address: 0.0.0.0
    Next server IP address: 0.0.0.0
    Relay agent IP address: 0.0.0.0
    Client MAC address: Pegatron_bb:30:10 (0c:54:a5:bb:30:10)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (53) DHCP Message Type (Discover)
        Length: 1
        DHCP: Discover (1)
    Option: (61) Client identifier
        Length: 7
        Hardware type: Ethernet (0x01)
        Client MAC address: Pegatron_bb:30:10 (0c:54:a5:bb:30:10)
    Option: (50) Requested IP Address (192.168.0.212)
        Length: 4
        Requested IP Address: 192.168.0.212
    Option: (12) Host Name
        Length: 22
        Host Name: Robi_Ideapad710_laptop
    Option: (60) Vendor class identifier
        Length: 8
        Vendor class identifier: MSFT 5.0
    Option: (55) Parameter Request List
        Length: 14
        Parameter Request List Item: (1) Subnet Mask
        Parameter Request List Item: (3) Router
        Parameter Request List Item: (6) Domain Name Server
        Parameter Request List Item: (15) Domain Name
        Parameter Request List Item: (31) Perform Router Discover
        Parameter Request List Item: (33) Static Route
        Parameter Request List Item: (43) Vendor-Specific Information
        Parameter Request List Item: (44) NetBIOS over TCP/IP Name Server
        Parameter Request List Item: (46) NetBIOS over TCP/IP Node Type
        Parameter Request List Item: (47) NetBIOS over TCP/IP Scope
        Parameter Request List Item: (119) Domain Search
        Parameter Request List Item: (121) Classless Static Route
        Parameter Request List Item: (249) Private/Classless Static Route (Microsoft)
        Parameter Request List Item: (252) Private/Proxy autodiscovery
    Option: (255) End
        Option End: 255
 

[bully · Accepted solution]

Stupid mistake.

forgot to include MX_LwIP_Process in while loop...

Regards,

Rob.