I'm working on some embedded devices which should be connected to a large network (hundreds of devices) via ethernet and that should be configured using the DHCP protocol. What I'm experiencing is that apparently the devices get the address in some networks but not in others. I setup a test network with just one client, a switch and a DHCP server (Ubuntu Linux). The address is correctly assigned and the DHCP server logs show the DORA sequence.
I tried to connect the same client to a common home router with a DHCP server (it is my home router, so it should be working properly) and the IP address is not acquired by the client. This is the sequence dump for the device:
No. Time Source Destination Protocol Length Info
86 26.515684000 :: ff02::16 ICMPv6 90 Multicast Listener Report Message v2
Frame 86: 90 bytes on wire (720 bits), 90 bytes captured (720 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: IPv6mcast_00:00:00:16 (33:33:00:00:00:16)
Internet Protocol Version 6, Src: :: (::), Dst: ff02::16 (ff02::16)
Internet Control Message Protocol v6
No. Time Source Destination Protocol Length Info
87 26.515688000 :: ff02::1:ff91:de41 ICMPv6 78 Neighbor Solicitation for fe80::260:6eff:fe91:de41
Frame 87: 78 bytes on wire (624 bits), 78 bytes captured (624 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: IPv6mcast_ff:91:de:41 (33:33:ff:91:de:41)
Internet Protocol Version 6, Src: :: (::), Dst: ff02::1:ff91:de41 (ff02::1:ff91:de41)
Internet Control Message Protocol v6
No. Time Source Destination Protocol Length Info
88 26.596056000 0.0.0.0 255.255.255.255 DHCP 371 DHCP Discover - Transaction ID 0xb444e919
Frame 88: 371 bytes on wire (2968 bits), 371 bytes captured (2968 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 0
Transaction ID: 0xb444e919
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: DavicomS_91:de:41 (00:60:6e:91:de:41)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type
Option: (57) Maximum DHCP Message Size
Option: (60) Vendor class identifier
Option: (12) Host Name
Option: (55) Parameter Request List
Option: (255) End
No. Time Source Destination Protocol Length Info
94 27.515730000 fe80::260:6eff:fe91:de41 ff02::2 ICMPv6 70 Router Solicitation from 00:60:6e:91:de:41
Frame 94: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: IPv6mcast_00:00:00:02 (33:33:00:00:00:02)
Internet Protocol Version 6, Src: fe80::260:6eff:fe91:de41 (fe80::260:6eff:fe91:de41), Dst: ff02::2 (ff02::2)
Internet Control Message Protocol v6
No. Time Source Destination Protocol Length Info
119 30.427837000 0.0.0.0 255.255.255.255 DHCP 371 DHCP Discover - Transaction ID 0xb444e919
Frame 119: 371 bytes on wire (2968 bits), 371 bytes captured (2968 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 0
Transaction ID: 0xb444e919
Seconds elapsed: 4
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: DavicomS_91:de:41 (00:60:6e:91:de:41)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type
Option: (57) Maximum DHCP Message Size
Option: (60) Vendor class identifier
Option: (12) Host Name
Option: (55) Parameter Request List
Option: (255) End
No. Time Source Destination Protocol Length Info
122 30.985580000 fe80::260:6eff:fe91:de41 ff02::16 ICMPv6 90 Multicast Listener Report Message v2
Frame 122: 90 bytes on wire (720 bits), 90 bytes captured (720 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: IPv6mcast_00:00:00:16 (33:33:00:00:00:16)
Internet Protocol Version 6, Src: fe80::260:6eff:fe91:de41 (fe80::260:6eff:fe91:de41), Dst: ff02::16 (ff02::16)
Internet Control Message Protocol v6
No. Time Source Destination Protocol Length Info
127 31.525478000 fe80::260:6eff:fe91:de41 ff02::2 ICMPv6 70 Router Solicitation from 00:60:6e:91:de:41
Frame 127: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: IPv6mcast_00:00:00:02 (33:33:00:00:00:02)
Internet Protocol Version 6, Src: fe80::260:6eff:fe91:de41 (fe80::260:6eff:fe91:de41), Dst: ff02::2 (ff02::2)
Internet Control Message Protocol v6
No. Time Source Destination Protocol Length Info
138 35.535297000 fe80::260:6eff:fe91:de41 ff02::2 ICMPv6 70 Router Solicitation from 00:60:6e:91:de:41
Frame 138: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: IPv6mcast_00:00:00:02 (33:33:00:00:00:02)
Internet Protocol Version 6, Src: fe80::260:6eff:fe91:de41 (fe80::260:6eff:fe91:de41), Dst: ff02::2 (ff02::2)
Internet Control Message Protocol v6
No. Time Source Destination Protocol Length Info
142 39.405342000 0.0.0.0 255.255.255.255 DHCP 371 DHCP Discover - Transaction ID 0xb444e919
Frame 142: 371 bytes on wire (2968 bits), 371 bytes captured (2968 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 0
Transaction ID: 0xb444e919
Seconds elapsed: 13
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: DavicomS_91:de:41 (00:60:6e:91:de:41)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type
Option: (57) Maximum DHCP Message Size
Option: (60) Vendor class identifier
Option: (12) Host Name
Option: (55) Parameter Request List
Option: (255) End
No. Time Source Destination Protocol Length Info
392 55.264802000 0.0.0.0 255.255.255.255 DHCP 371 DHCP Discover - Transaction ID 0xb444e919
Frame 392: 371 bytes on wire (2968 bits), 371 bytes captured (2968 bits) on interface 0
Ethernet II, Src: DavicomS_91:de:41 (00:60:6e:91:de:41), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 0
Transaction ID: 0xb444e919
Seconds elapsed: 29
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: DavicomS_91:de:41 (00:60:6e:91:de:41)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type
Option: (57) Maximum DHCP Message Size
Option: (60) Vendor class identifier
Option: (12) Host Name
Option: (55) Parameter Request List
Option: (255) End
It is my understanding that the DHCP discover is not answered. Is this correct? Do you have any idea why?
EDIT: I tried to check again the packets using wireshark, and I can see the option Option: (53) DHCP Message Type. By expanding that I see DHCP Discovery. That does seem DHCP to me. I also checked a Mac OS X DHCP packet using wireshark, and I still see "Message type: Boot Request (1)" in the packets. The only difference is that no DHCP Discovery is sent, just a DHCP Request for the address. Also, the same adapter is not working under Windows 7.
So, is this really the bootp protocol? Can you confirm that? Or is it DHCP? And why does DHCP Discover messages are sent but no DHCP Offer is sent back?
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