DHCPINFORM

Marty Sørensen buzzwork at gmail.com
Wed Feb 4 12:44:36 UTC 2009


Hey Randall,

Thanks for the reply. It seens that the switch relay's the option-82 OK, in
this case, but the server drops it ?

Martin

On Wed, Feb 4, 2009 at 9:49 AM, Randall C Grimshaw <rgrimsha at syr.edu> wrote:

> There are known issues with Inform. It tracks global options OK but options
> defined more specifically and provided correctly in the offer can be
> overridden in the inform. But option-82 data comes from specific relay
> types. You might need to review the switch documentation.
>
> ________________________________________
> From: dhcp-users-bounces at lists.isc.org [dhcp-users-bounces at lists.isc.org]
> On Behalf Of Marty Sørensen [buzzwork at gmail.com]
> Sent: Wednesday, February 04, 2009 3:29 AM
> To: dhcp-users at lists.isc.org
> Subject: DHCPINFORM
>
> Hello,
>
> Hope some one can help me or kick me in the right direction on this matter.
>
> I have been reading the RFC on DHCPINFORM but cant find out if the
> DHCPserver has to reply with all options (special option-82) on DHCPINFORM -
> ACK ?
>
> This snif is from an Debian 3.0.7 box. It seems that the DHCPserver is
> dropping the option-82 information. Is this right or a "feature / bug" :-)
>
> Hope to get some info.
>
> Many thanks
>
> Martin
> DK
>
> ---
>
> ---------------------------------------------------------------------------
>  TIME: 12:38:24.455494
>    IP: > (00:1e:f7:5e:63:7a) >  (00:50:56:97:32:84)
>    OP: 1 (BOOTPREQUEST)
>  HTYPE: 1 (Ethernet)
>  HLEN: 6
>  HOPS: 1
>   XID: 03e645e9
>  SECS: 768
>  FLAGS: 0
> CIADDR: 89.x.x.155
> YIADDR: 0.0.0.0
> SIADDR: 0.0.0.0
> GIADDR: 89.x.x.252
> CHADDR: 00:30:05:ed:6a:a5:00:00:00:00:00:00:00:00:00:00
>  SNAME: .
>  FNAME: .
> OPTION:  53 (  1) DHCP message type         8 (DHCPINFORM)
> OPTION:  61 (  7) Client-identifier         01:00:30:05:ed:6a:a5
> OPTION:  12 (  9) Host name                 STATION'R
> OPTION:  60 (  8) Vendor class identifier   MSFT 5.0
> OPTION:  55 ( 12) Parameter Request List      1 (Subnet mask)
>                                             15 (Domainname)
>                                              3 (Routers)
>                                              6 (DNS server)
>                                             44 (NetBIOS name server)
>                                             46 (NetBIOS node type)
>                                             47 (NetBIOS scope)
>                                             31 (Perform router discovery)
>                                             33 (Static route)
>                                            249 (MSFT - Classless route)
>                                             43 (Vendor specific info)
>                                            252 (MSFT - WinSock Proxy Auto
> Detect)
>
> OPTION:  43 (  3) Vendor specific info      dc0100           ...
> OPTION:  82 ( 18) Relay Agent Information
>                  Circuit-ID    01:08:00:65                  <unknown-0>
> *MALFORMED -- TOO LARGE*
>
> ---------------------------------------------------------------------------
>  TIME: 12:38:24.456317
>    IP: > (00:50:56:97:32:84) >  (00:1e:f7:5e:63:7a)
>    OP: 2 (BOOTPREPLY)
>  HTYPE: 1 (Ethernet)
>  HLEN: 6
>  HOPS: 1
>   XID: 03e645e9
>  SECS: 768
>  FLAGS: 0
> CIADDR: 89.x.x.155
> YIADDR: 0.0.0.0
> SIADDR: 0.0.0.0
> GIADDR: 89.x.x.253
> CHADDR: 00:30:05:ed:6a:a5:00:00:00:00:00:00:00:00:00:00
>  SNAME: .
>  FNAME: .
> OPTION:  53 (  1) DHCP message type         5 (DHCPACK)
> OPTION:  54 (  4) Server identifier         10.57.2.1
> OPTION:   1 (  4) Subnet mask               255.255.255.0
> OPTION:  15 ( 21) Domainname                internet.dbnet.hef.dk<
> http://internet.dbnet.hef.dk>
> OPTION:   3 (  4) Routers                   89.x.x.254
> OPTION:   6 (  8) DNS server                82.x.x.20,82.x.x.20
> ---------------------------------------------------------------------------
> ---
> _______________________________________________
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