> Am 25.01.2022 um 15:30 schrieb James Szinger <jszin...@gmail.com>:
> 
> On Tue, 25 Jan 2022 01:48:24 +0100
> Peter Boy <p...@uni-bremen.de> wrote:
> 
>> ...
>> 
>> Konfiguration is much easier and it causes less system load. The only
>> disadvantage is that the VMs cannot communicate directly with the
>> host. But it is usually better to use an internal, protected network
>> for this. 
> 
> This, for me, is a fatal limitation.  The web server needs to access
> the database server and so on.  At home I have just one network and
> every thing is internal.

In this case libvirt virtual network is for you. It’s already there, you just 
have to use it. That network create an internal, protected (from public) 
network. The typical use case is a public service like web server that will 
access a service you want protect from public access, typically a database. You 
won’t make the database accessible from the public. If you web server should be 
able to access the database over the public interface, you must open the 
firewall port and everyone from outside can access the database as well and try 
to attack it.

Therefore a common structure is to install service, esp. a database natively on 
the host and isolate the host from internet as far as possible, usually you 
just allow ssh or vpn. Public service are installed in a VM with as publicly 
accessible as needed. 

>  At work we have an internal network and all
> internet-facing services are on an isolated network with an industrial
> grade firewall and application filter severely restricting access from
> the internet.  All the hosts are already on an “internal” network of
> some variety, so setting up a another one seems redundant.

Yes, the text I linked does not set up another network but makes the internal 
network accessible for the VMs

> I also feel that configuring the host for bridge mode is much more
> convenient than installing a separate physical network.

There is no additional separate physical network involved besides those your 
host is already connected to (1 network at your home, 2 networks at work). 

Please, read the linked text again and give me a hint, where the wording is 
misleading so we can improve that. 


Thanks
Peter



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