Using dhcpcd client to fetch vendor specific options
rajeev Gaur
rajeev11gaur at gmail.com
Mon Mar 13 13:23:56 UTC 2023
Hello Darren and all
I searched on the web, I was not able to find any method for setting option
55 or for getting Option 43 items.
I checked the github queries that community has posted but nothing for
vendor options.
I feel that dhcpcd support is comparatively lesser than dhclient.
My problem is the project I am working on is using yocto build environment
and yocto build environment supports dhcpcd client by default.
For dhclient probably there will be requirement for cross-compiling the
code and then generate binary for the hardware, still will it work or not.
But I don't mind giving it a try.
Any suggestions / hints are welcome.
Thanks
Rje
On Sun, Mar 12, 2023 at 1:12 AM rajeev Gaur <rajeev11gaur at gmail.com> wrote:
> Hello Darren and All
>
> Thank you for the response.
> Yes you are correct, I need to use dhcp client to fetch vendor options
> (option 43) items from DHCP Server.
> Ok let me check how can I set option 55 Parameter Request List. But I was
> not able to find it in dhcpcd man pages.
> Let me search further on net.
>
> Thanks
> Rajeev
>
> On Sat, Mar 11, 2023 at 10:15 PM Darren Ankney <darren.ankney at gmail.com>
> wrote:
>
>> Rje,
>>
>> If I understand correctly, you are wanting your DHCP client to fetch
>> option 43 content from the server. There should be a way, in dhcpcd,
>> to modify option 55 (parameter request list) adding the vendor options
>> (option 43) to the list of requested parameters. Then the server will
>> return the option 43 content.
>>
>> On Sat, Mar 11, 2023 at 2:29 AM rajeev Gaur <rajeev11gaur at gmail.com>
>> wrote:
>> >
>> > Hello Sir
>> >
>> > I am working on a project for fetching various different categories of
>> information from dhcp server.
>> > DHCP Server: ISC DHCP Server 4.4.1
>> > Client: dhcpcd 9.4.0, Compiled in features: INET ARP ARPing IPv4LL
>> INET6 DHCPv6 AUTH
>> > Build environment: Yocto
>> >
>> > At this point when I am writing this mail, the basic working looks good.
>> >
>> > The DHCP server, starts stops restarts well. In logs I can see the
>> DISCOVER / OFFER / REQUEST / ACK all working fine. Lease IP is properly
>> provided to client.
>> >
>> > #
>> >
>> > # DHCP Server Configuration file.
>> >
>> > # see /usr/share/doc/dhcp*/dhcpd.conf.sample
>> >
>> > #
>> >
>> >
>> >
>> > authoritative;
>> >
>> >
>> >
>> > option space Vendor-ONAS-INFO code width 1 length width 1 hash size 5;
>> >
>> > option Vendor-ONAS-INFO.ipadd code 1 = ip-address;
>> >
>> > option Vendor-ONAS-INFO.port code 9 = unsigned integer 16;
>> >
>> >
>> >
>> > subnet 192.168.2.0 netmask 255.255.255.0 {
>> >
>> > range 192.168.2.35 192.168.2.52;
>> >
>> > option routers 192.168.2.56;
>> >
>> > option subnet-mask 255.255.255.0;
>> >
>> > option domain-name-servers 8.8.8.8;
>> >
>> > default-lease-time 100;
>> >
>> > max-lease-time 100;
>> >
>> > option host-name "OR-SERVER";
>> >
>> > option ntp-servers 138.12.56.111;
>> >
>> > option vendor-class-identifier "Vendor-ONAS";
>> >
>> > vendor-option-space Vendor-ONAS-INFO;
>> >
>> > option Vendor-ONAS-INFO.ipadd 192.168.71.50;
>> >
>> > option Vendor-ONAS-INFO.port 11372;
>> >
>> > }
>> >
>> >
>> > On the client side, dhcpcd, I have kept information to allow and deny
>> interfaces, enabled the standard DHCP options for which I am getting values
>> ( except for dhcp_client_identifier).
>> > When I am performing ifdown and ifup for eth0 I am getting one leased
>> IP from the dhcp server.
>> >
>> > #Use the hardware address of the interface for the Client ID
>> > clientid
>> > allowinterfaces eth0
>> > denyinterfaces eth1
>> >
>> > option ntp_servers
>> > option dhcp_server_identifier
>> > option dhcp_client_identifier (**Not getting this output)
>> >
>> > My problem / Query:
>> > 1) What option to give in dhcpcd.conf to fetch the vendor options that
>> i have declared in dhcpd.conf at the server side.
>> > 2) Do I need to enable any thing on any side (client or server).
>> >
>> > I did not see much documentation for dhcpcd client for vendor options.
>> > I did saw the dhcpcd.conf man page for vendor information but it shows:
>> > vendor code ,valueAdd an encapsulated vendor option. code should be
>> between 1 and 254 inclusive. To add a raw vendor string, omit code but keep
>> the comma. Examples. Set the vendor option 01 with an IP address.vendor
>> 01,192.168.0.2Set the vendor option 02 with a hex code.vendor
>> 02,01:02:03:04:05Set the vendor option 03 with an IP address as a
>> string.vendor 03,\"192.168.0.2\"Set un-encapsulated vendor option to hello
>> world.vendor ,"hello world"
>> >
>> > But I don't need to add any vendor option I have to fetch it from the
>> server.
>> >
>> > I also tried giving vendorclassid so that it can fetch the details
>> provided for the vendor class identifier in the server, but i don't see any
>> output.
>> >
>> > I have previously worked with dhclient and i was able to fetch
>> information using that and I also see it has much more documentation
>> online. But i see less documentation for dhcpcd. But this is the only
>> recommended client for Yocto build environment.
>> >
>> > Please suggest how can I fetch the vendor options using dhcpcd client.
>> >
>> > Thanks
>> > Rje
>> > --
>> > ISC funds the development of this software with paid support
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>> information.
>> >
>> > dhcp-users mailing list
>> > dhcp-users at lists.isc.org
>> > https://lists.isc.org/mailman/listinfo/dhcp-users
>> --
>> ISC funds the development of this software with paid support
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>> information.
>>
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>>
>
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