Hey, I'v been trying all around, reading guides for installation and so long, always loose connection to our root-server after changing network setup. We did this before on debian8 and all worked well, now it doesn't want to work ... hope somebody can help. We have seperate IPs for virtual machines and want to get in bridged mode, as we had before... Server: hetzner root-Server Installation: Debian-90-stretch-64-minimal 2 drives with RAID 1, partitions as follows: swap 16G, /boot 1G, / 10G, /home 10G, /var/log 1G After plain installation, I do check network-setup: ifconfig Code: enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet <main-ip> netmask <given-from-hetzner> broadcast <given-from-hetzner> and so on /etc/network/interfaces reads as follows: Code: ### Hetzner Online GmbH installimage source /etc/network/interfaces.d/* auto lo iface lo inet loopback iface lo inet6 loopback auto enp4s0 iface enp4s0 inet static address <main-IP> netmask <given-from-hetzner> gateway <given-from-hetzner> # route <given-from-hetzner>/27 via <given-from-hetzner> up route add -net <given-from-hetzner> netmask <given-from-hetzner> gw <given-from-hetzner> dev enp4s0 iface enp4s0 inet6 static address <given-from-hetzner>::2 netmask 64 gateway <given-from-hetzner> Afterwards I follow the steps from debian-wiki: Setting_up_your_Bridge To get a bridge up and running, I do install bridge-utils: Code: apt update apt upgrade apt install bridge-utils I do add a bridge: Code: brctl addbr br0 Result is: Code: ip address show 3: br0: <BROADCAST,MULTICAST> besides 1: lo and 2: enp4s0 (if you'd need more info here, I could post more) Next one is: Code: brctl addif br0 enp4s0 and check, it's gone! Can't get any connection, ping is suddenly lost. If I do a soft reboot, everything is fine since the changes before were not static. I also did try to do same things with /etc/network/interfaces, (re-)added stuff, took something away, and so on. Tried different guides from debian-, hetzner- and other wikis, always with the same result of loosing connectiong / server not coming up... Normally I can go back via rescue-sonsole, but sometimes it can't even start anymore, although I put exact config from beginning in /etc/network/interfaces and reboot ... any ideas? please help!
The following guides, besides others, were tried: debian-wiki KVM#Between_VM_host.2C_guests_and_the_world hetzner-wiki Netzkonfiguration_Debian/en#Bridged hetzner-wiki KVM_mit_Nutzung_aller_IPs_-_the_easy_way#Host
Spocky, it works. If so, one need to add MAC-address in /etc/network/interfaces for br0! Code: hwaddress ether c8:xx:00:xx:xx:xx
Now my complete /etc/network/interfaces looks like this: Code: ### Hetzner Online GmbH installimage #source /etc/network/interfaces.d/* auto lo iface lo inet loopback iface lo inet6 loopback #auto enp4s0 #iface enp4s0 inet static # address <main-IP> # netmask <given-from-hetzner> # gateway <given-from-hetzner> # # route .../27 via ... # up route add -net ... netmask ... gw ... dev enp4s0 #iface enp4s0 inet6 static # address .....::2 # netmask 64 # gateway fe80::1 auto br0 iface br0 inet static address <main-IP> netmask <given-from-hetzner> gateway <given-from-hetzner> hwaddress ether <your-MAC> bridge_ports enp4s0 bridge_stp off bridge_fd 1 bridge_hello 2 bridge_maxage 12 iface br0 inet6 static address <main-IPv6>::2 netmask 64 gateway fe80::1
