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I am working on a fresh installed Debian Buster installation on a remote host located in a data center elsewhere.

I have a script ready to copy the working standard /etc/network/interfaces back in place and reboot with an at command entry should a problem arise altering the network configuration.

When i add a bridge br0 entry into the /etc/network/interfaces and call ifup br0, the bridge interface appears as follows:

br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet xx.xxx.62.204  netmask 255.255.255.0  broadcast xx.xxx.62.255
        inet6 xxxx::7a2b:cbff:fe71:b0b0  prefixlen 64  scopeid 0x20<link>
        ether 78:xx:xx:xx:b0:b0  txqueuelen 1000  (Ethernet)
        RX packets 1722  bytes 80621 (78.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5  bytes 426 (426.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet xx.xxx.62.204  netmask 255.255.255.0  broadcast xx.xxx.62.255
        ether 78:xx:xx:xx:b0:b0  txqueuelen 1000  (Ethernet)
        RX packets 27871902  bytes 1784816339 (1.6 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 10682  bytes 1326822 (1.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Lokale Schleife)
        RX packets 26  bytes 3455 (3.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 26  bytes 3455 (3.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

with this /etc/network/interfaces entry:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

The loopback network interface


auto lo
iface lo inet loopback


The primary network interface


auto eno1
iface eno1 inet static
        address xx.xxx.62.204
        netmask 255.255.255.0
        network xx.xxx.62.0
        broadcast xx.xxx.62.255
        gateway xx.xxx.62.254


iface eno1 inet6 static
        address xxxx:198:ff0d:e800::/40
        pre-up echo 0 > /proc/sys/net/ipv6/conf/eno1/accept_dad
        post-up ip -6 route add default via xxxx:198:ff00::1
        up ip -6 addr add xxxx:198:ff0d:e800::1/40 dev $IFACE
        down ip -6 addr del xxxx:198:ff0d:e800::1/40 dev $IFACE


auto br0
iface br0 inet static
        address xx.xxx.62.204
        netmask 255.255.255.0
        gateway xx.xxx.62.254
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
        bridge_maxwait 0

But after a few seconds the ssh connection freezes, a ping packet no longer arrives and i have to wait for the emergency script to repair/reboot.

The whole attempt is to provide a kvm virtual machine on the host with a bridge interface to have access to the outside world via a separate IP4 address.

The added bridge entry is according to this serverfault post

Torsten
  • 21

0 Answers0