Thread: Why do both my NICs have the same MAC address?

hi guys,

installed ubuntu 12.10, everything's going great, except 2 nics, first day, configuring nics can both become bonded can both used. used balance-rr , worked great. next day rebooted machine, things got awol reason. no longer used both network interfaces since lost "eth1" , reason though unbonded 2 nics, both of them have same mac address though /etc/udev/rules.d/70-persistent-net.rules file have them defined separately (original stock ubuntu detected file):

code:

# pci device 0x8086:/sys/devices/pci0000:00/0000:00:19.0 (e1000e) subsystem=="net", action=="add", drivers=="?*", attr{address}=="50:e5:49:ed:6e:55", attr{dev_id}=="0x0", attr{type}=="1", kernel=="eth*", name="eth0"  # pci device 0x1969:/sys/devices/pci0000:00/0000:00:1c.6/0000:06:00.0 (atl1c) subsystem=="net", action=="add", drivers=="?*", attr{address}=="50:e5:49:e6:1e:64", attr{dev_id}=="0x0", attr{type}=="1", kernel=="eth*", name="eth1"

however, whenever check ifconfig, spits out this:

code:

eth0      link encap:ethernet  hwaddr 50:e5:49:ed:6e:55             inet addr:192.168.0.11  bcast:192.168.0.255  mask:255.255.255.0           inet6 addr: fe80::52e5:49ff:feed:6e55/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:506 errors:0 dropped:0 overruns:0 frame:0           tx packets:412 errors:0 dropped:0 overruns:0 carrier:1           collisions:0 txqueuelen:1000            rx bytes:177126 (177.1 kb)  tx bytes:46240 (46.2 kb)  lo        link encap:local loopback             inet addr:127.0.0.1  mask:255.0.0.0           inet6 addr: ::1/128 scope:host           loopback running  mtu:16436  metric:1           rx packets:695 errors:0 dropped:0 overruns:0 frame:0           tx packets:695 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0            rx bytes:71861 (71.8 kb)  tx bytes:71861 (71.8 kb)  rename3   link encap:ethernet  hwaddr 50:e5:49:ed:6e:55             inet addr:192.168.0.11  bcast:192.168.0.255  mask:255.255.255.0           inet6 addr: fe80::52e5:49ff:feed:6e55/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:4103 errors:0 dropped:0 overruns:0 frame:0           tx packets:3093 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:3379067 (3.3 mb)  tx bytes:566750 (566.7 kb)           interrupt:20 memory:f7f00000-f7f20000

here original bonding configuration:

code:

auto eth0 iface eth0 inet manual bond-master bond0  auto eth1 iface eth1 inet manual bond-master bond0  auto bond0 allow-hotplug bond0 iface bond0 inet dhcp        bond-mode balance-rr        bond-miimon 100        bond-slaves eth0 eth1

the 2 nics onboard nics on gigabyte ga-z77x-ud5h motherboard.

have ideas why happens? potential solutions appreciated.

many thanks,
deltatux

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