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The same IP configured on different compute nodes

**Hi, i have one controller and two compute nodes, running nova-network, i have created the following vmnet.

nova network-create vmnet --fixed-range-v4=192.168.11.0/24 --bridge-interface=br100 --multi-host=T --gateway=192.168.11.253 --dns1=192.168.11.36 --dns2=192.168.11.24

when i start the Cirros instances, the vmnet gateway IP address 192.168.11.253 will be configured on the bridge br100 on each compute node, however the VM's can comunicate with the external network. Will this be a problem ?**

root@compute1:~# ifconfig br100
br100     Link encap:Ethernet  HWaddr b8:ca:3a:ec:66:8c
          inet addr:192.168.11.253  Bcast:192.168.11.255  Mask:255.255.255.0
          inet6 addr: fe80::baca:3aff:feec:668c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9043 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20972 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:903366 (903.3 KB)  TX bytes:2504357 (2.5 MB)

root@compute1:~# ip addr
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
    inet 169.254.169.254/32 scope link lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br100 state UP qlen 1000
    link/ether b8:ca:3a:ec:66:8c brd ff:ff:ff:ff:ff:ff
    inet6 fe80::baca:3aff:feec:668c/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:66:8e brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:66:90 brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:66:92 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0a:f7:24:1e:40 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.182/24 brd 10.10.10.255 scope global eth4
    inet6 fe80::20a:f7ff:fe24:1e40/64 scope link
       valid_lft forever preferred_lft forever
7: eth5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:0a:f7:24:1e:42 brd ff:ff:ff:ff:ff:ff
8: br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether b8:ca:3a:ec:66:8c brd ff:ff:ff:ff:ff:ff
    inet 192.168.11.253/24 brd 192.168.11.255 scope global br100
    inet 192.168.11.182/24 brd 192.168.11.255 scope global secondary br100
    inet6 fe80::baca:3aff:feec:668c/64 scope link
       valid_lft forever preferred_lft forever
10: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether d6:bd:23:e0:86:1f brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
11: vlan100@br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br100 state UP
    link/ether fa:16:3e:94:98:cc brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f816:3eff:fe94:98cc/64 scope link
       valid_lft forever preferred_lft forever
14: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:e9:73:2b brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fee9:732b/64 scope link
       valid_lft forever preferred_lft forever
15: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:79:63:1a brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe79:631a/64 scope link
       valid_lft forever preferred_lft forever

root@compute2:~# ifconfig br100
br100     Link encap:Ethernet  HWaddr b8:ca:3a:ec:7b:3a
          inet addr:192.168.11.253  Bcast:192.168.11.255  Mask:255.255.255.0
          inet6 addr: fe80::baca:3aff:feec:7b3a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10420 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21246 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:997249 (997.2 KB)  TX bytes:2545513 (2.5 MB)

root@compute2:~# ip addr
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
    inet 169.254.169.254/32 scope link lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br100 state UP qlen 1000
    link/ether b8:ca:3a:ec:7b:3a brd ff:ff:ff:ff:ff:ff
    inet6 fe80::baca:3aff:feec:7b3a/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:7b:3c brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:7b:3e brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:7b:40 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0a:f7:24:25:a0 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.183/24 brd 10.10.10.255 scope global eth4
    inet6 fe80::20a:f7ff:fe24:25a0/64 scope link
       valid_lft forever preferred_lft forever
7: eth5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:0a:f7:24:25:a2 brd ff:ff:ff:ff:ff:ff
8: br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether b8:ca:3a:ec:7b:3a brd ff:ff:ff:ff:ff:ff
    inet 192.168.11.253/24 brd 192.168.11.255 scope global br100
    inet 192.168.11.183/24 brd 192.168.11.255 scope global secondary br100
    inet6 fe80::baca:3aff:feec:7b3a/64 scope link
       valid_lft forever preferred_lft forever
10: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 22:8b:bd:c8:52:90 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
11: vlan100@br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br100 state UP
    link/ether fa:16:3e:6c:5b:1f brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f816:3eff:fe6c:5b1f/64 scope link
       valid_lft forever preferred_lft forever
13: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:10:c8:29 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe10:c829/64 scope link
       valid_lft forever preferred_lft forever
14: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:7d:78:56 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe7d:7856/64 scope link
       valid_lft forever preferred_lft forever

The same IP configured on different compute nodes

**Hi, i I have one controller and two compute nodes, running nova-network, i have created the following vmnet.

 # nova network-create vmnet --fixed-range-v4=192.168.11.0/24 --bridge-interface=br100 --multi-host=T --gateway=192.168.11.253 --dns1=192.168.11.36 --dns2=192.168.11.24

--dns2=192.168.11.24

when i start the Cirros instances, the vmnet gateway IP address 192.168.11.253 will be configured on the bridge br100 on each compute node, however the VM's can comunicate with the external network. Will this be a problem ?**

root@compute1:~# ifconfig br100
br100     Link encap:Ethernet  HWaddr b8:ca:3a:ec:66:8c
          inet addr:192.168.11.253  Bcast:192.168.11.255  Mask:255.255.255.0
          inet6 addr: fe80::baca:3aff:feec:668c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9043 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20972 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:903366 (903.3 KB)  TX bytes:2504357 (2.5 MB)

root@compute1:~# ip addr
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
    inet 169.254.169.254/32 scope link lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br100 state UP qlen 1000
    link/ether b8:ca:3a:ec:66:8c brd ff:ff:ff:ff:ff:ff
    inet6 fe80::baca:3aff:feec:668c/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:66:8e brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:66:90 brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:66:92 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0a:f7:24:1e:40 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.182/24 brd 10.10.10.255 scope global eth4
    inet6 fe80::20a:f7ff:fe24:1e40/64 scope link
       valid_lft forever preferred_lft forever
7: eth5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:0a:f7:24:1e:42 brd ff:ff:ff:ff:ff:ff
8: br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether b8:ca:3a:ec:66:8c brd ff:ff:ff:ff:ff:ff
    inet 192.168.11.253/24 brd 192.168.11.255 scope global br100
    inet 192.168.11.182/24 brd 192.168.11.255 scope global secondary br100
    inet6 fe80::baca:3aff:feec:668c/64 scope link
       valid_lft forever preferred_lft forever
10: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether d6:bd:23:e0:86:1f brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
11: vlan100@br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br100 state UP
    link/ether fa:16:3e:94:98:cc brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f816:3eff:fe94:98cc/64 scope link
       valid_lft forever preferred_lft forever
14: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:e9:73:2b brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fee9:732b/64 scope link
       valid_lft forever preferred_lft forever
15: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:79:63:1a brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe79:631a/64 scope link
       valid_lft forever preferred_lft forever

root@compute2:~# ifconfig br100
br100     Link encap:Ethernet  HWaddr b8:ca:3a:ec:7b:3a
          inet addr:192.168.11.253  Bcast:192.168.11.255  Mask:255.255.255.0
          inet6 addr: fe80::baca:3aff:feec:7b3a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10420 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21246 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:997249 (997.2 KB)  TX bytes:2545513 (2.5 MB)

root@compute2:~# ip addr
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
    inet 169.254.169.254/32 scope link lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br100 state UP qlen 1000
    link/ether b8:ca:3a:ec:7b:3a brd ff:ff:ff:ff:ff:ff
    inet6 fe80::baca:3aff:feec:7b3a/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:7b:3c brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:7b:3e brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether b8:ca:3a:ec:7b:40 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0a:f7:24:25:a0 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.183/24 brd 10.10.10.255 scope global eth4
    inet6 fe80::20a:f7ff:fe24:25a0/64 scope link
       valid_lft forever preferred_lft forever
7: eth5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:0a:f7:24:25:a2 brd ff:ff:ff:ff:ff:ff
8: br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether b8:ca:3a:ec:7b:3a brd ff:ff:ff:ff:ff:ff
    inet 192.168.11.253/24 brd 192.168.11.255 scope global br100
    inet 192.168.11.183/24 brd 192.168.11.255 scope global secondary br100
    inet6 fe80::baca:3aff:feec:7b3a/64 scope link
       valid_lft forever preferred_lft forever
10: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 22:8b:bd:c8:52:90 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
11: vlan100@br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br100 state UP
    link/ether fa:16:3e:6c:5b:1f brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f816:3eff:fe6c:5b1f/64 scope link
       valid_lft forever preferred_lft forever
13: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:10:c8:29 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe10:c829/64 scope link
       valid_lft forever preferred_lft forever
14: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
    link/ether fe:16:3e:7d:78:56 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe7d:7856/64 scope link
       valid_lft forever preferred_lft forever