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Re: Environment variable for BOOTP next server?

From: Andrei Borzenkov
Subject: Re: Environment variable for BOOTP next server?
Date: Mon, 16 Jan 2017 18:43:50 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

16.01.2017 12:50, Steven Shiau пишет:
> Dear all,
> When using dnsmasq with proxy function, i.e., to separate the DHCP
> service with BOOTP service. The GRUB environment variable
> "net_default_server" or "net_<interface>_dhcp_server_name" is about the
> DHCP server.

Reviewing RFC 951 (with clarifications) - it is absolutely unclear what
this variable actually means. RFC only says about possible usage of this
field by client; nothing is ever said about what *server* should set it to.

> Is there any variable reserved for BOOTP next server? I

net_<interface>_next_server is set to the value of siaddr field of BOOTP
reply, which is defined as "next server" by RFC.

> just can not find it in the grub2 manual.

It is present in current GIT.

> The reason I need this is to put that as a kernel parameter, similar to
> what syslinux has "IPAPPEND 1" so that some info about DHCP/BOOTP
> service can be appended to /proc/cmdline.
> Thank you very much.
> Steven

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