dhcpcd: raw-ip support

[Yegor Yefremov]

I have a project where I'm using dhcpcd client. It is working without
any problems with older modems like Quectel UC20 etc. But now we want
to switch to SIM7600G-H and it is working in raw-ip mode. So far only
udhcpc can handle such MAC address-less interfaces.

Do you know what is so special about udhcpc compared to other DHCP
clients? Is there any raw-ip related documentation?

I've started a thread [1] on the dhcpcd mailing list.

[1] https://roy.marples.name/archives/dhcpcd-discuss/0002546.html

Regards,
Yegor