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Re: [SOLVED] Re: Migrating Debian installation to a new motherboard

David Wright <deblis@lionunicorn.co.uk> writes:

> On Thu 01 Nov 2018 at 20:03:05 (-0600), Joe Pfeiffer wrote:
>> local10 <local10@tutanota.com> writes:
>> > Nov 1, 2018, 1:57 PM by mstone@debian.org:
>> >> On Thu, Nov 01, 2018 at 05:43:56PM +0100, local10 wrote:
>> >>
>> >> That means it's down. Note that you said enp3so above, that should
>> >> be enp3s0 (zero); which did you put in interfaces? Also, there
>> >> should be either "auto enp3s0" or "allow-hotplug enp3s0". Assuming
>> >> that's all right, try manually running "ifup -v enp3s0".
>> >
>> > That was it. I did have "allow-hotplug" but it was still pointing
>> > to enp2s0, not paying attention obviously. After changing
>> > "allow-hotplug enp3s0" the network came back, everything works.
>> >
>> > So my experience indicates that it is quite possible to replace the
>> > motherboard, stick the old hard disk in and the only change that's
>> > required (in my case) was to change "/etc/network/interfaces" to
>> > reflect the new interface name from enp2s0 to enp3s0 . No need to
>> > change NIC MAC address.
>> >
>> > Thanks to everyone who responded.
>> For what it's worth, I'm running network-manager and my ethernet port
>> (enp4s0 in my case) isn't listed in /etc/network/interfaces at all.  All
>> that's in there is lo (the loopback interface).
> FWIW if it were listed in /e/n/i, then nm would not manage it, would it.
> I expect you've got the interface name stored in nm's connection
> profile instead.
> BTW in a network set up like my own, the place where the MAC would be
> relevant is in the DHCP server (here, the router) because that is how
> the IP number is assigned. An unassigned MAC will get given an IP
> address, and it will conect to the Internet, but other
> machines on the LAN would not recognise it. (Although the router can
> hand out IP numbers, it doesn't run a nameserver.)

Though in my case my DHCP server is dnsmasq on another machine, which
happily associates hostnames with the IP addresses so my machines can
indeed find each other.

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