Re: kvm problem: bonding network interface breaks dhcp

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Hi Matt,

Matthew Palmer wrote:
> 
> The output of brctl show, ip addr list, and cat /proc/net/bonding/bond*
> might be helpful.
> 

Sure. Using the bridge on the bonding interface (while the
guest was running) I got:


# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.001517ab0a59       no              bond0
                                                        vnet0
# ip addr list
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth2: <BROADCAST,MULTICAST,PROMISC,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:30:48:c6:e0:98 brd ff:ff:ff:ff:ff:ff
4: eth3: <BROADCAST,MULTICAST,PROMISC,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
5: _rename: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:30:48:c6:e0:99 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,PROMISC,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
7: eth5: <BROADCAST,MULTICAST,PROMISC,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
8: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::215:17ff:feab:a59/64 scope link
       valid_lft forever preferred_lft forever
51: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
    inet 172.19.96.25/23 brd 172.19.97.255 scope global br0
    inet6 fe80::215:17ff:feab:a59/64 scope link
       valid_lft forever preferred_lft forever
52: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
    link/ether c6:d7:7b:fb:02:35 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::c4d7:7bff:fefb:235/64 scope link
       valid_lft forever preferred_lft forever
# cat /proc/net/bonding/bond*
Ethernet Channel Bonding Driver: v3.5.0 (November 4, 2008)

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth2
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:ab:0a:59

Slave Interface: eth3
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:ab:0a:58

Slave Interface: eth4
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:ab:0a:5b

Slave Interface: eth5
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:ab:0a:5a



For not using bonding I got

# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.001517ab0a59       no              eth2
                                                        vnet0
# ip addr list
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth2: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::215:17ff:feab:a59/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:30:48:c6:e0:98 brd ff:ff:ff:ff:ff:ff
4: eth3: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:15:17:ab:0a:58 brd ff:ff:ff:ff:ff:ff
5: _rename: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:30:48:c6:e0:99 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:15:17:ab:0a:5b brd ff:ff:ff:ff:ff:ff
7: eth5: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:15:17:ab:0a:5a brd ff:ff:ff:ff:ff:ff
8: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noqueue state DOWN
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
53: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 00:15:17:ab:0a:59 brd ff:ff:ff:ff:ff:ff
    inet 172.19.96.25/23 brd 172.19.97.255 scope global br0
    inet6 fe80::215:17ff:feab:a59/64 scope link
       valid_lft forever preferred_lft forever
54: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
    link/ether fe:2f:ce:cc:ec:ac brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc2f:ceff:fecc:ecac/64 scope link
       valid_lft forever preferred_lft forever


Hope this helps. Regards

Harri
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