send-hostname/DHCP Option 12 for lab environment?

send-hostname/DHCP Option 12 for lab environment?

[Thom R Harmon]

Hello, folks.

I have a lab environment where the DHCP server allows DHCP clients to 
register a name and then coordinates that name with the environment's 
DNS server to allow local clients to perform A record lookup. For the 
life of me I cannot configure how to tell Guix System DHCP client nodes 
to use send-hostname/DHCP Option 12. Anybody have an example?

thx

Re: send-hostname/DHCP Option 12 for lab environment?

[Felix Lechner via]

Hi Thom,

On Wed, Oct 09 2024, Thom R Harmon wrote:

> I cannot configure how to tell Guix System DHCP client nodes to use
> send-hostname/DHCP Option 12.

Did you already try the 'host-name' option from the example in the
manual page for dhclient? [1]

I never tried it but you can probably pass a file-like object [2] as a
'config-file' field [3] to the dhcp-client-service-type.

The '-H' option to dhclient looks like DHCP option twelve. [4]

Kind regards
Felix

[1] https://linux.die.net/man/5/dhclient.conf
[2] like this, https://codeberg.org/lechner/system-config/src/commit/a61e3731399bcd0f26a85688cd7ee37107b3266c/host/wallace-server/operating-system.scm#L473
[3] https://guix.gnu.org/manual/devel/en/html_node/Networking-Setup.html#index-dhcp_002dclient_002dconfiguration
[4] https://github.com/isc-projects/dhcp/blob/572032cb0e514606559de3784e3f7ca8e1539d17/includes/dhcp.h#L101

Re: send-hostname/DHCP Option 12 for lab environment?

[Thom Harmon]

Thank you, Felix. 

I will give that a try. My question came about less from unfamiliarity
with ISC2 tools than from unfamiliarity with the Guix APIs and idioms.
I was expecting perhaps some util function or param I could set as
opposed to crafting the config syntax directly. 

Getting a feel for the idioms.

Thanks again.