Error: Connection activation failed

[Shiven Dave]

Hello Friends,

I am using cent os 7 and I want to configure network bridge through nmcli.

here is what I done

nmcli con add type bridge con-name nm-bridge ifname bridge
nmcli con modify nm-bridge ipv4.addresses '192.168.1.2/24'
nmcli con modify nm-bridge ipv4.gateway '192.168.1.1'
nmcli con modify nm-bridge ipv4.method manual
nmcli con add type bridge-slave con-name br0-port1 ifname enp2s0 master bridge

brctl show output like this

bridge name bridge id STP enabled interfaces
bridge 8000.000000000000 yes

nmcli connection up br0-port1

Error: Connection activation failed: Connection 'br0-port1' is not available on the device enp2s0 at this time.

ip link shows following

1: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp2s0: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT qlen 1000
link/ether 00:1d:ba:00:97:40 brd ff:ff:ff:ff:ff:ff
3: wlp3s0: mtu 1500 qdisc mq state UP mode DORMANT qlen 1000
link/ether 00:21:5d:02:45:30 brd ff:ff:ff:ff:ff:ff
4: bridge: mtu 1500 qdisc noqueue state DOWN mode DEFAULT
link/ether d6:fe:f7:5b:91:af brd ff:ff:ff:ff:ff:ff

please help regarding this if any one has idea what's wrong

[Sham Arsiwala]

Hi.

Just three steps to follow,

1 define a software bridge called br1

nmcli con add type bridge con-name br1 ifname br1

2. Configure ipv4 address

nmcli con mod br1 ipv4.addresses 192.168.0.1/24

nmcli con mod br1 ipv4.method manual

If needed add gw and dns too in above cmd

3. Attach interface to br1

nmcli con add type bridge-slave con-name br1-port0 ifname eth0 master br1

And check with

brctl show

Hope this will help you.

Sham Arsiwala

RHCE - RHCA.

Electromech Corporation

9099099855.

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[Shiven Dave]

Hello Sir,

I just tried your solution but still its not working its showing same error

I think something goes wrong with interface it might be due to update that  device enp2s0 is not working. 

[DEEPAK MISHRA]

Dear Shiven,

     Hello ! This  is deepak. first check your ethernet device status with "nmcli device status". If it is connected with any profile then it is working fine. Afterward follow below commands sequence

1. nmcli connection add con-name bridge type bridge ip4 192.168.0.170/24 gw4 192.168.0.253
2. nmcli connection modify bridge ipv4.dns 8.8.8.8
3. nmcli device status   ( it will show device nm-bridge under Device & you don't need to define device name while adding connection)
4. nmcli connection add con-name slave ifname enp9s0 type bridge-slave master nm-bridge

      use ip, gateway & dns as per your environment. I hope it will certainly work.

                                                                                    Thanks
Deepak Mishra                                                           Date - 20-09-2015

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Date: Fri, 18 Sep 2015 22:03:33 -0700
From: shiven...@gmail.com
To: vg...@googlegroups.com
Subject: Re: [VGLUG] Error: Connection activation failed

Hello Sir,

I just tried your solution but still its not working its showing same error

I think something goes wrong with interface it might be due to update that  device enp2s0 is not working. 

[Shiven Dave]

Hi Deepakji,

thanks for your fast reply and commands sequence but still its showing same error

I also checked with device status before bridge setup and after bridge setup

nmcli dev status shows following

DEVICE  TYPE      STATE        CONNECTION    
wlp3s0     wifi         connected    Auto Engineers
enp2s0    ethernet  unavailable      --            
lo            loopback unmanaged     --            

[DEEPAK MISHRA]

It is showing device enp2s0 is unavailable. So try to reinstall it. first run "lspci" command to check chipset no. of your ethernet device then search it on 'elrepo'. Then follow the steps as I have sent to you earlier.

                                                                                                          Thanks

Deepak Mishra                                                                                  Date 21-09-2015

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Date: Sun, 20 Sep 2015 12:44:14 -0700
From: shiven...@gmail.com
To: vg...@googlegroups.com
CC: deepak_...@hotmail.com

Subject: Re: [VGLUG] Error: Connection activation failed

[Shiven Dave]

Hi Deepakji,

problem resolved its problem of Network Manager

I just disable the Network Manager and now bridging done successfully.

Thanks for suggestion about driver re installation I learned new things about drivers compilation installation procedures.

If anybody facing issues related to this then please disable Network Manager.

Thanks all for help