On Wed, Jan 31, 2018 at 10:46 AM, Tim <ignored_mail...@yahoo.com.au> wrote:
> Hi,
>
> I have what's probably an odd-ball desire:
>
> I have a PC with a 100 Mb/s motherboard ethernet interface, and a 1
> Gb/s PCI card ethernet interface. And IPs are assigned from a Fedora
> PC running a DHCP server which reconfigures its DNS server, on the fly.
>
> I'd like the PC to always get assigned the same IP, and hostname,
> regardless of which ethernet port the (single) ethernet cable would get
> plugged in to. I'd like the addressing to be consistent, and just
> work. Having the PC change addresses because the cable got plugged
> into a different port breaks other things on the network.
>
> This is the stanza for this PC in the dhcpd.conf file:
>
> host oddbox {
> # hardware ethernet 00:24:21:9A:6F:6C;
> hardware ethernet C8:3A:35:DC:54:59;
> fixed-address 192.168.1.12;
> option host-name "oddbox";
> }
>
> It won't allow me to specify two macs, hence one being hashed out.
>
> Is this sort of thing do-able? (And controlled from the DHCP server,
> not manually on the PC in question.)
>
> Yes, I know there'd be a world of pain if someone tried to connect both
> ports at the same time. But there's only one ethernet cable, so that
> can't happen. And I really don't want to physically block the slower
> motherboard ethernet port, to prevent it being used accidentally.
>
> --
> [tim@localhost ~]$ uname -rsvp
> Linux 4.14.14-200.fc26.x86_64 #1 SMP Fri Jan 19 13:27:06 UTC 2018 x86_64
>
> Boilerplate: All mail to my mailbox is automatically deleted.
> There is no point trying to privately email me, I only get to see
> the messages posted to the mailing list.
>
> This email brought to you by potato omelates
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>
Better yet, is there a way to have DHCP reject requests from the
motherboard NIC?
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