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Re: bridge questions

I set things up using nm-connection-editor under XFCE.  Maybe it
doesn't work because I have a duplicate device definition for eno1 and
br0_slave_eno1.

On Tue, Dec 22, 2015 at 01:34:16PM -0700, Nathanael Noblet wrote:

em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 74:d4:35:1a:b5:37  txqueuelen 1000  (Ethernet)
        RX packets 10912543  bytes 15860446938 (14.7 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5389161  bytes 461229048 (439.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xf0500000-f0520000  

bridge0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.4.100  netmask 255.255.255.0  broadcast 192.168.4.255
        inet6 fe80::76d4:35ff:fe1a:b537  prefixlen 64  scopeid 0x20<link>
        ether 74:d4:35:1a:b5:37  txqueuelen 0  (Ethernet)
        RX packets 7353297  bytes 15478919588 (14.4 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5370959  bytes 438417978 (418.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

You can see the MAC address is the same. Also perhaps the only reason is that em1 is the only *hardware* 
slave?


On Dec 22, 2015, at 12:16 PM, Chuck Anderson <cra WPI EDU> wrote:

Thanks, can you please show me the output of:

ifconfig bridge0

ifconfig em1

On Tue, Dec 22, 2015 at 12:13:15PM -0700, Nathanael Noblet wrote:

I’m using F23 with a bridge. These are my config files. 

[root iridium gnat]# cat /etc/sysconfig/network-scripts/ifcfg-Bridge_connection_1 
DEVICE=bridge0
STP=no
TYPE=Bridge
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME="Bridge connection 1"
UUID=62a5d08c-1e57-4f03-8ee3-f9998b6c5714
ONBOOT=yes
ZONE=dmz
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_PRIVACY=no

Slave:
[root iridium gnat]# cat /etc/sysconfig/network-scripts/ifcfg-em1 
HWADDR=74:D4:35:1A:B5:37
TYPE=Ethernet
NAME=em1
UUID=12721930-c418-4f00-9476-5e08d2150faf
DEVICE=em1
ONBOOT=yes
BRIDGE=bridge0
ZONE=dmz
BRIDGING_OPTS=path_cost=19

My router is configured to give MAC address 74:D4:35:1A:B5:37 a static IP. Then I have a vm network 
attached to the bridge and they each get their own IPs as well.

Hope that helps.


On Dec 22, 2015, at 11:03 AM, Chuck Anderson <cra WPI EDU> wrote:

I'm using Fedora 23.

How do I create a bridge with an unchanging MAC address?  Ideally, I'd
like to be able to clone the MAC address of the first slave device.  I
tried setting HWADDR= and MACADDR= in the ifcfg file for the bridge,
but everytime the bridge is activated a new random MAC address is used
for the bridge device.  I need an unchanging MAC address so that my
DHCP server can assign the same IP to the system's bridge interface.

# cat /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
STP=no
TYPE=Bridge
IPV6INIT=no
NAME=br0
UUID=f77b4a25-526d-4a7f-a5fd-3698e02d1ac5
ONBOOT=yes
# I tried each of these and both together:
#HWADDR=B8:CA:3A:8C:C4:B8
#MACADDR=B8:CA:3A:8C:C4:B8

# cat /etc/sysconfig/network-scripts/ifcfg-br0_slave_eno1 
HWADDR=B8:CA:3A:8C:C4:B8
TYPE=Ethernet
NAME="br0 slave eno1"
UUID=e297c8ac-ba8b-434e-b8d0-714995cecf8e
DEVICE=eno1
ONBOOT=yes
BRIDGE=br0

Since I couldn't get the above to work, I next tried setting the
underlying ethernet device "eno1" to use DHCP.  But after adding this
same device (eno1) as a slave for a new bridge (br0), now it seems the
br0 device never gets configured with eno1 as a slave.

# cat /etc/sysconfig/network-scripts/ifcfg-eno1
# Generated by dracut initrd
NAME="eno1"
DEVICE="eno1"
ONBOOT=yes
NETBOOT=yes
UUID="1cddebe7-e202-4300-9fe6-fb46b9a0415e"
IPV6INIT=yes
TYPE=Ethernet
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
BOOTPROTO=dhcp
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_PRIVACY=no

Dec 22 12:57:39 workstation NetworkManager[1087]: <info>  (br0): new Bridge device (carrier: OFF, 
driver: 'bridge', ifindex: 21)
Dec 22 12:57:39 workstation NetworkManager[1087]: <info>  (br0): device state change: unmanaged -> 
unavailable (reason 'managed') [10 20 2]
Dec 22 12:57:39 workstation systemd-udevd[18904]: Could not generate persistent MAC address for br0: No 
such file or directory
Dec 22 12:57:39 workstation kernel: IPv6: ADDRCONF(NETDEV_UP): br0: link is not ready
Dec 22 12:57:39 workstation NetworkManager[1087]: <info>  (br0): device state change: unavailable -> 
disconnected (reason 'none') [20 30 0]
Dec 22 12:57:39 workstation NetworkManager[1087]: <info>  (br0): Activation: starting connection 'br0' 
(f77b4a25-526d-4a7f-a5fd-3698e02d1ac5)
Dec 22 12:57:39 workstation NetworkManager[1087]: <info>  (br0): device state change: disconnected -> 
prepare (reason 'none') [30 40 0]
Dec 22 12:57:39 workstation NetworkManager[1087]: <info>  (br0): device state change: prepare -> config 
(reason 'none') [40 50 0]
Dec 22 12:57:40 workstation NetworkManager[1087]: <info>  (br0): device state change: config -> 
ip-config (reason 'none') [50 70 0]
Dec 22 12:57:40 workstation NetworkManager[1087]: <info>  (br0): device state change: ip-config -> 
secondaries (reason 'ip-config-unavailable') [70 90 5]
Dec 22 12:57:40 workstation NetworkManager[1087]: <info>  (br0): device state change: secondaries -> 
activated (reason 'none') [90 100 0]
Dec 22 12:57:40 workstation kernel: IPv6: ADDRCONF(NETDEV_UP): br0: link is not ready
Dec 22 12:57:40 workstation NetworkManager[1087]: <info>  (br0): Activation: successful, device 
activated.
Dec 22 12:57:40 workstation nm-dispatcher[18762]: Dispatching action 'up' for br0

# brctl show br0
bridge name  bridge id            STP enabled     interfaces
br0            8000.000000000000  no              

So I'm stuck in a situation where I can't create a bridge that I'd
like to use for KVM (virt-manager) where the host itself still has IP
connectivity over that same physical Ethernet port...
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