Network unreachable without GUI?

jlourenco

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Hello,

I have a proxmox setup with a Routed interface vmbr0.

I've given this interface to a Windows VM and configured the network there with the correct subnet, ip and gateway. Windows is accessing goodly the network.
I've done the same thing on a Ubuntu 20 with Desktop, again working goodly. (same configs)
Then I've done the same thing on a Ubuntu 20 Server (no GUI) and it keeps complaining it can't reach the web.

When I check for differences between "ip addr" on the Ubuntu 20 with Desktop and the one without the only differenceI find is the one that works as a "noprefixroute" flag on the interface and also, the Desktop named its interface eth0 while the server one named it ens18. Not sure why this difference since they are using the same configs on the virtualiser.

Any ideas how I can find the reason being this wierd issue?


Thanks
 


khedger

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494
I really have little info for you, but the name of the interface 'ens18' sounds almost like the system thinks it's some other kind of device that might be found in /dev......that MIGHT be a clue...but then again....it might mean nothing.

keith
 

khedger

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494
I'm putting on my QA hat here (I used to be a professional):

If the configurations are exactly the same, then it seems to me that the next thing to check out would be some kind of scaling issue with either the VM software or your system. I'm not expressing myself well because I'm trying to express a 'gut feeling' kind of thing.
So I ask myself "okay what's the difference between these two systems?" So the config of each is the same, so that might mean that something about the existence of the configured interfaces are bumping up against some limit or scaling factor, or relationship (in the greater system/VM landscape) that is causing the system to become confused. I know, rantings of a madman.....it's a gut thing man!
the other thing that occurs is whether there is a difference in the networking between Ubuntu desktop and Ubuntu server. And how the 'virtuality' of your environment might be affecting it?

keith
 

jlourenco

New Member
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Indeed, there's a difference here, so Ubuntu Desktop uses Network Manager or something like that while Ubuntu Server uses Networkd or something like that :) (sorry network noob here)
Bit even with this difference, when I do ip addr I see the same configuration which in my head, that was the ultimate goal :D but now it seems that even with the same configuration somehow it doesn't work
 


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