Open Stack

Hi all,

I am testing the nova-network + vlan + multi_host. But I found that the
ip_forward is enable automatically when launch new instances. You can check
the code
https://github.com/openstack/nova/blob/master/nova/network/linux_net.py#L770

I found there is some issue seriously when the ip_forward=1 on compute
node. Here my testing process

Controller:

[root at openstack-controller conf.d]# ip a
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: p3p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 90:b1:1c:0d:87:79 brd ff:ff:ff:ff:ff:ff
    inet 192.168.3.10/24 brd 192.168.3.255 scope global p3p1
    inet6 fe80::92b1:1cff:fe0d:8779/64 scope link
       valid_lft forever preferred_lft forever
3: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 90:b1:1c:0d:87:7a brd ff:ff:ff:ff:ff:ff
    inet 172.16.0.10/24 brd 172.16.0.255 scope global em1
    inet6 fe80::92b1:1cff:fe0d:877a/64 scope link
       valid_lft forever preferred_lft forever

Computer Node:

[root at openstack-node2 vlan]# ip a
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000

    link/ether 90:b1:1c:0d:73:ea brd ff:ff:ff:ff:ff:ff
    inet 172.16.0.12/24 brd 172.16.0.255 scope global em1
    inet6 fe80::92b1:1cff:fe0d:73ea/64 scope link
       valid_lft forever preferred_lft forever
4: p3p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:10:18:f7:4a:34 brd ff:ff:ff:ff:ff:ff
    inet 192.168.3.12/24 brd 192.168.3.255 scope global p3p1
    inet 192.168.3.33/32 scope global p3p1
    inet6 fe80::210:18ff:fef7:4a34/64 scope link
       valid_lft forever preferred_lft forever
9: vlan102 at em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UP
    link/ether fa:16:3e:54:ea:11 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f816:3eff:fe54:ea11/64 scope link
       valid_lft forever preferred_lft forever
10: br102: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UNKNOWN
    link/ether fa:16:3e:54:ea:11 brd ff:ff:ff:ff:ff:ff
    inet 10.0.102.4/24 brd 10.0.102.255 scope global br102
    inet6 fe80::2816:24ff:feb5:5770/64 scope link
       valid_lft forever preferred_lft forever
11: vlan103 at em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UP
    link/ether fa:16:3e:3a:a0:20 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f816:3eff:fe3a:a020/64 scope link
       valid_lft forever preferred_lft forever
12: br103: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UNKNOWN
    link/ether fa:16:3e:3a:a0:20 brd ff:ff:ff:ff:ff:ff
    inet 10.0.103.4/24 brd 10.0.103.255 scope global br103
    inet6 fe80::480c:f2ff:fe9b:a600/64 scope link
       valid_lft forever preferred_lft forever
13: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN qlen 500
    link/ether fe:16:3e:0c:65:73 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe0c:6573/64 scope link
       valid_lft forever preferred_lft forever
15: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN qlen 500
    link/ether fe:16:3e:7f:a2:d5 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe7f:a2d5/64 scope link
       valid_lft forever preferred_lft forever
16: vnet2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN qlen 500
    link/ether fe:16:3e:31:8f:7c brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe31:8f7c/64 scope link
       valid_lft forever preferred_lft forever
17: vnet3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN qlen 500
    link/ether fe:16:3e:63:8c:e2 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc16:3eff:fe63:8ce2/64 scope link
       valid_lft forever preferred_lft forever
[root at openstack-node2 vlan]# brctl show
bridge name    bridge id        STP enabled    interfaces
br102        8000.fa163e54ea11    no        vlan102
                            vnet0
                            vnet1
                            vnet2
br103        8000.fa163e3aa020    no        vlan103
                            vnet3
virbr0        8000.525400aaa1b5    yes        virbr0-nic

if the ip_forward=1, then vm1(vnet1) can ping vm2(vnet4) and controller can
ping vm1(vnet1) and vm2(vnet4). this should be wrong.

Any body meet this error? and how to fix this except for changing the code.
-- 
Lei Zhang

Blog: http://jeffrey4l.github.com
twitter/weibo: @jeffrey4l
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