On 9/17/21 18:46, Laine Stump wrote: > On 9/17/21 7:11 AM, Michael Ströder wrote: >> I'm using libvirt 7.7.0 on openSUSE Tumbleweed. >> >> Until recently everything just worked. But now my virtual NAT network is >> not usable anymore. >> [..] >> # virsh net-start vnet1 >> error: Failed to start network vnet1 >> error: internal error: Network is already in use by interface virbr0 > > Someone else (probably libvirt itself, for libvirt's "default" network) > has created a bridge device called virbr0, and has set it up on the same > subnet that you are trying to use for your network, which is confusingly > called "vnet1". Many thanks for pointing me into the right direction. The culprit was an interface definition in NetworkManager's config. Not sure whether I had added it myself months/years ago or not. After removing it and rebooting(!) everything seems to work as expected. Thanks again! Ciao, Michael.
