Option 61 (Client ID) in DHCPOFFER
Dima Fadeyev
dima at scancom.es
Thu Nov 24 15:24:42 UTC 2011
Thanks for your reply,
I've included this line into my dhcpd.conf:
option dhcp-parameter-request-list 1,3,6,12,15,26,28,42,61;
As you can see, option 61 is included. However I still can't make dhcp
server include the option 61 into dhcpoffer. This is how my dhcpdiscover
and dhcpoffer packets look like right now:
On 11/23/2011 08:21 PM, Laurent PROUFF wrote:
TIME: 16:00:11.283846
IP: > (00:d0:cb:cf:d0:ab) > (Broadcast)
OP: 1 (BOOTPREQUEST)
HTYPE: 1 (Ethernet)
HLEN: 6
HOPS: 0
XID: 64217936
SECS: 0
FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:d0:cb:cf:d0:ab:00:00:00:00:00:00:00:00:00:00
SNAME: .
FNAME: .
OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER)
OPTION: 61 ( 7) Client-identifier 01:00:d0:cb:cf:d0:ab
OPTION: 60 ( 11) Vendor class identifier udhcp 1.9.2
OPTION: 57 ( 2) Maximum DHCP message size 576
OPTION: 55 ( 8) Parameter Request List 1 (Subnet mask)
3 (Routers)
6 (DNS server)
12 (Host name)
15 (Domainname)
26 (Interface MTU)
28 (Broadcast address)
42 (NTP servers)
---------------------------------------------------------------------------
TIME: 16:00:11.284036
IP: > (00:22:4d:38:37:27) > (00:d0:cb:cf:d0:ab)
OP: 2 (BOOTPREPLY)
HTYPE: 1 (Ethernet)
HLEN: 6
HOPS: 0
XID: 64217936
SECS: 0
FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 10.0.0.154
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:d0:cb:cf:d0:ab:00:00:00:00:00:00:00:00:00:00
SNAME: .
FNAME: .
OPTION: 53 ( 1) DHCP message type 2 (DHCPOFFER)
OPTION: 54 ( 4) Server identifier 10.0.0.32
OPTION: 51 ( 4) IP address leasetime 340600 (3d22h36m40s)
OPTION: 1 ( 4) Subnet mask 255.255.255.0
OPTION: 3 ( 4) Routers 10.0.0.2
OPTION: 6 ( 8) DNS server 10.0.0.2,8.8.8.8
OPTION: 12 ( 7) Host name foobar2
OPTION: 15 ( 11) Domainname example.com
OPTION: 26 ( 2) Interface MTU 1500
OPTION: 28 ( 4) Broadcast address 10.0.0.255
OPTION: 42 ( 4) NTP servers 10.0.0.32
Best regards,
Dima Fadeyev
> hello,
>
> maybe it can help.... (from man dhcp-options)
>
> *option dhcp-parameter-request-list* /uint16/ [*,* /uint16/... ]*;*
> This option, when sent by the client, specifies which options the
> client wishes the server to return. Normally, in the ISC DHCP client,
> this is done using the /request/ statement. If this option is not
> specified by the client, the DHCP server will normally return every
> option that is valid in scope and that fits into the reply. When this
> option is specified on the server, the server returns the specified
> options. This can be used to force a client to take options that it
> hasn't requested, and it can also be used to tailor the response of
> the DHCP server for clients that may need a more limited set of
> options than those the server would normally return.
>
> regards,
> laurent
>
> 2011/11/23 Dima Fadeyev <dima at scancom.es <mailto:dima at scancom.es>>
>
> Hello everyone,
>
> I have a quick question. Is it possible to make ISC dhcpd server
> insert the option 61 (client id) in DHCPOFFER, in case if it is
> present in DHCPDISCOVER?
> The ISC dhcpd version we are using is dhcp-4.1.1
> (dhcp-4.1.1-12.P1.el6_0.4.x86_64 CentOS rpm).
>
> Thanks in advance
>
> --
> Dima Fadeyev
>
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>
>
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