[CentOS] ifconfig showing same mac for 2 nics in same bond

aurfalien at gmail.com aurfalien at gmail.com
Tue Oct 6 20:19:42 UTC 2009


Hi all,

I just noticed that my two nics that are bonded via mode 0 are showing  
the same mac addy in ifconfig.

Is this normal because of the nature of my bond?

In syslog I keep getting;
kernel: pbond0: received packet with  own address as source address

Some guidance is appreciated before I dive in and troubleshoot.

If I don't list the mac addy in my ifcfg-th# files, only one of the 2  
nic comes up during boot.

If I turn off bonding, then each nic shows its correct mac addy.

This leads me to believe that since my switch isn't config'd for  
bonding when in mode 0, that the mac addy must be duplicated amongst  
all members of the bond in order for packets to be distributed; ie the  
bond to work in round robin fashion.

uname;
2.6.18-128.7.1.el5xen

/etc/modprode.conf
alias eth0 tg3
alias eth1 tg3
alias eth2 forcedeth
alias eth3 forcedeth
alias scsi_hostadapter2 mptsas
alias scsi_hostadapter mptspi
alias scsi_hostadapter1 mptfc
alias scsi_hostadapter2 mptsas
alias bond0 bonding
options bond0 miimon=80 mode=0
alias peth0 tg3

/etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme BCM5715 Gigabit Ethernet
DEVICE=eth0
BOOTPROTO=none
USERCTL=no
HWADDR=00:23:8B:CE:9C:5C
ONBOOT=yes
MASTER=bond0
SLAVE=yes
TYPE=Ethernet

/etc/sysconfig/network-scripts/ifcfg-eth1
# Broadcom Corporation NetXtreme BCM5715 Gigabit Ethernet
DEVICE=eth1
BOOTPROTO=none
USERCTL=no
HWADDR=00:23:8B:CE:9C:5D
ONBOOT=yes
MASTER=bond0
SLAVE=yes
TYPE=Ethernet

/etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
IPADDR=10.0.70.11
NETMASK=255.255.0.0
NETWORK=10.0.0.0
BROADCAST=10.0.255.255
GATEWAY=10.0.10.1
ONBOOT=yes
BOOTPROTO=none
USERCTL=no
TYPE=Ethernet


ifconfig output;
bond0     Link encap:Ethernet  HWaddr 00:23:8B:CE:9C:5C
          inet addr:10.0.70.11  Bcast:10.0.255.255  Mask:255.255.0.0
          inet6 addr: fe80::223:8bff:fece:9c5c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10714 errors:0 dropped:0 overruns:0 frame:0
          TX packets:386 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1157674 (1.1 MiB)  TX bytes:37307 (36.4 KiB)

eth0      Link encap:Ethernet  HWaddr 00:23:8B:CE:9C:5C
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:5618 errors:0 dropped:0 overruns:0 frame:0
          TX packets:192 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:694966 (678.6 KiB)  TX bytes:20541 (20.0 KiB)
          Interrupt:21

eth1      Link encap:Ethernet  HWaddr 00:23:8B:CE:9C:5C
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:5570 errors:0 dropped:0 overruns:0 frame:0
          TX packets:191 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:685771 (669.6 KiB)  TX bytes:19584 (19.1 KiB)
          Interrupt:22

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2111 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2111 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5464730 (5.2 MiB)  TX bytes:5464730 (5.2 MiB)

pbond0    Link encap:Ethernet  HWaddr 00:23:8B:CE:9C:5C
          inet6 addr: fe80::223:8bff:fece:9c5c/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:11188 errors:0 dropped:0 overruns:0 frame:0
          TX packets:383 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1380737 (1.3 MiB)  TX bytes:40125 (39.1 KiB)

virbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask: 
255.255.255.0
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:468 (468.0 b)


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