Re: bridge questions

[Chuck Anderson <cra WPI EDU>]

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...