network not working on a Cloudmin machine

System: CentOS 7. Has 2 NICs. NIC eno1 was working/active for Virtualmin.

I was trying to create/activate Bridge br0 with NIC eno1. Obviously, i did something wrong, now the network itself is down completely. Unable install/update anything.

result of service network restart : Failed to start LSB: Bring up/down networking.

Result of ifup /etc/sysconfig/network-scripts/ifcfg-eno1
Error: Connection activation failed: Master device br0 unmanaged or not available for activation

For now, I am able to access the machine via second NIC eno2, locally. Even with this connection on/working, unable to install/update anything.

Able to access Cloudmin server locally via Recheck Configuration gave no error: But noted that the ‘detected external IP address matches’ message was absent.

Help! I am stuck…

Update: I do not get that error when I do ‘service network restart’ that I got before. But, still no internet connection.

This is what I get when I do ‘wget’::
–2016-08-29 11:33:43--
Resolving (…, 2607:f8b0:4000:80d::200e
Connecting to (||:80… failed: No route to host.
Connecting to (|2607:f8b0:4000:80d::200e|:80… failed: Network is unreachable.


Hmm, what output do you receive if you run the command “/sbin/ifconfig” on the host?

Also, note that you may want to consider filing this as a support request using the Support link above, then Jamie and I could better give you a hand there (he doesn’t monitor the Forums, and I receive faster notifications from the support tracker).


Not sure about centOS but in Ubuntu here’s working cfg for /etc/network/interfaces for a br0 bridge with ipv4 and ipv6. Maybe give you an idea whats missing.
There should be nothing in interfaces cfg referencing eno1 if thats to be the bridged connection.

auto br0
iface br0 inet static
address x.x.x.186
netmask x.x.x.248
broadcast x.x.x.191
network x.x.x.184
gateway x.x.x.185
dns-nameservers x.x.x.186 x.x.x.187 x.x.x.3
dns-search sitename…com
bridge_ports eth0
bridge_stp off
bridge_fd 9
bridge_maxwait 0
bridge_hello 2
bridge_maxage 12
post-up ip link set br0 address bc:ae:c5:55:c3:95
post-up iptables-restore < /etc/iptables.up.rules

iface br0 inet6 static
pre-up /sbin/modprobe -q ipv6 ; /bin/true
address xxx:xxxx:xxxx:xxxx::2
netmask 64
up ifconfig br0 inet6 add xxx:xxxx:xxxx:xxxx::102/64
up ifconfig br0 inet6 add xxx:xxxx:xxxx:xxxx::103/64
up ifconfig br0 inet6 add xxx:xxxx:xxxx:xxxx::101/64
up ifconfig br0 inet6 add xxx:xxxx:xxxx:xxxx::104/64
gateway xxx:xxxx:xxxx:xxxx::1