dhclient: Ignore vendor-identifying DHCP options defined in RFC 3925

[michaelo]

Summary

Ignore DHCP options 124 and 125 to shut up the warning messages.
These options are defined in the RFC 3925.

PR: 281361

[jlduran]

sbin/dhclient/dhcp.h

177

For me, either DHO_V_I_VENDOR_CLASS or DHO_VI_VENDOR_CLASS are fine, however, they must match the definition in the header file (same for DHO_V_I_VENDOR_OPTS and DHO_VI_VENDOR_OPTS).

[michaelo]

Process comments

[jlduran]

Tested against a Kea server, with a simplified version of the following example:
https://github.com/isc-projects/kea/blob/master/doc/examples/kea4/vivso.json

NOTE: For my future reference/testing:

Basically, just add:

{
    "data": "1",
    "name": "vivso-suboptions",
    "always-send": true
}

The essential part is always-send, by default Kea will send this option only if requested.

[jrm]

Thank you Jose and Tom.