David Wright <deb...@lionunicorn.co.uk> writes: > On Thu 01 Nov 2018 at 20:03:05 (-0600), Joe Pfeiffer wrote: >> local10 <loca...@tutanota.com> writes: >> > Nov 1, 2018, 1:57 PM by mst...@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 192.168.1.200+, 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.
