CSCuh07704 - SG300 - Hosts pull incorrect IP address from DHCP server

FYI. There will be a new release of software this month.

Dear Patrick,
Thank you for the feedback to the Small Business Support Community.  You are right, the CSCuh07704 has already been given the "Resolved" status by 09-22-2013 and will be covered in the new firmware release, and just to give others a better idea of what the problem was:
B>Symptom:
Hosts will obtain incorrect IP address.
Conditions:
Issue occurs when the switch is in Layer 3 mode and embedded DHCP server is enabled.
Thank you again for your commitment and please do not hesitate to reach us back if there is anything we may assist you with in the meantime.
Kind regards,
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.

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            Length: 4
            Value: 0A132761
        Option: (t=51,l=4) IP Address Lease Time = 1 day, 23 hours, 39 minutes, 50 seconds
            Option: (51) IP Address Lease Time
            Length: 4
            Value: 00029E46
        Option: (t=58,l=4) Renewal Time Value = 23 hours, 49 minutes, 55 seconds
            Option: (58) Renewal Time Value
            Length: 4
            Value: 00014F23
        Option: (t=59,l=4) Rebinding Time Value = 1 day, 17 hours, 42 minutes, 16 seconds
            Option: (59) Rebinding Time Value
            Length: 4
            Value: 00024A78
        Option: (t=1,l=4) Subnet Mask = 255.255.255.240
            Option: (1) Subnet Mask
            Length: 4
            Value: FFFFFFF0
        Option: (t=6,l=8) Domain Name Server
            Option: (6) Domain Name Server
            Length: 8
            Value: AB44E278AB46A8B7
            IP Address: 171.68.226.120
            IP Address: 171.70.168.183
        Option: (t=44,l=8) NetBIOS over TCP/IP Name Server
            Option: (44) NetBIOS over TCP/IP Name Server
            Length: 8
            Value: AB443935AD2573BF
            IP Address: 171.68.57.53
            IP Address: 173.37.115.191
        Option: (t=3,l=4) Router = 10.19.39.97
            Option: (3) Router
            Length: 4
            Value: 0A132761
        End Option

    I have seen the same issue with my iOS and Mac OS devices (iPhone and MacBook Pro). I have written my own DHCP server (http://notebook.kulchenko.com/embedded/dhcp-and-dns-servers-with-arduino) and have had troubles getting my devices to connect (Windows Vista and Ubuntu devices connect fine). I suspect that this problem happens because the DHCP Offer message is sent to a broadcast address, even though (at least in my case) the broadcast flag is off in the DHCP Discover message I see.
    Unfortunately you didn't include the Discover message, so I can't tell for sure, but if it indeed has the broadcast flag set to 0, then the server should send the response message using unicast as per DHCP spec (http://www.ietf.org/rfc/rfc2131.txt, section 4.1):
      If the broadcast bit is not set and 'giaddr' is zero and
       'ciaddr' is zero, then the server unicasts DHCPOFFER and DHCPACK
       messages to the client's hardware address and 'yiaddr' address.
    So, it seems like in this case the server may be at fault, even though it would be nice for Mac OS to accept broadcast responses (and would solve my problem too).
    Can someone confirm that Mac OS does not accept broadcast responses to DHCP Discover and DHCP Request messages? Thanks.
    Paul.

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