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Re: My DHCP Discover do not have Option12 Host Name set ?

Jean-Louis Crouzet wrote:

Hi all,
any one could shed some light here thanks in advance. I'm trying to understand why my SMC Barricade DHCP Client Log never see my Debian's Machine name but XP ones...
Using customized Kernel 2.6.8-15 machine on a LAN behind a SMC Barricade 74004WBRA , during startup I compared the DHCP sequences content and find out that Option 12: Host Name = "Always set up with XP" but not with Debian!
I think that I might have a DHCP issue as I compared the two DHCP sequences (one with XP from scratch and one with Debian under same conditions, scratch meant Power ON and Boot)
On XP side just for DHCP the first attempt is the Request with Option 12: Host Name = "Already set up with XP". See details hereafter extracted from Ethereal Capture 

Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x04cba1a1
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    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: 00:50:70:a4:0c:8a (Chaintec_a4:0c:8a)
    Server host name not given
    Boot file name not given
    Magic cookie: (OK)
    Option 53: DHCP Message Type = DHCP Discover
    Option 116: DHCP Auto-Configuration (1 bytes)
    Option 61: Client identifier
        Hardware type: Ethernet
        Client MAC address: 00:50:70:a4:0c:8a (Chaintec_a4:0c:8a)
    Option 12: Host Name = "Melodie_Nelson"
    Option 60: Vendor class identifier = "MSFT 5.0"
    Option 55: Parameter Request List
        1 = Subnet Mask
        15 = Domain Name
        3 = Router
        6 = Domain Name Server
        44 = NetBIOS over TCP/IP Name Server
        46 = NetBIOS over TCP/IP Node Type
        47 = NetBIOS over TCP/IP Scope
        31 = Perform Router Discover
        33 = Static Route
        Unknown Option Code: 249
        43 = Vendor-Specific Information
    End Option
    Padding

While with Debian this option 12 is empty, see herafter:

Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0xc86e1461
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    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: 00:80:c7:11:94:e3 (Xircom_11:94:e3)
    Server host name not given
    Boot file name not given
    Magic cookie: (OK)
    Option 53: DHCP Message Type = DHCP Discover
    Option 55: Parameter Request List
        1 = Subnet Mask
        28 = Broadcast Address
        2 = Time Offset
        3 = Router
        15 = Domain Name
        6 = Domain Name Server
        12 = Host Name
So within my SMC Barricade DHCP Client Log I never see my Debian's Machine name... 

Any advise?

JL



Hi All,
just made some progress by removing the dhclient package and using dhclient3 instead. Then I edited my /etc/dhcp3/dhclient.conf and uncommented the send host-name and changed accordingly the "" content. 

My next stage is to be able to ssh any computer in this small domain
I look now deeper in the man pages for this configuration file.
I would like to get Mozilla or ssh able to find computer name rather than using IP address. This is I guess a local DNS way... 

Have a nice day.
JL
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