[ovs-discuss] internal port problem

Jesse Gross jesse at nicira.com
Thu Mar 14 15:22:30 UTC 2013


On Thu, Mar 14, 2013 at 4:14 AM, Fang <wchunx416 at 126.com> wrote:
> Hello
> I have some trouble when I test "internal port"
> I have a vm on my host
> br0:192.168.0.238
> I set:
> ovs-vsctl add-port br0 vlan1 tag=1 -- set interface vlan1 type=internal
> ifconfig vlan1 192.168.10.1 netmask 255.255.255.0 up
> echo 1 > /proc/sys/net/ipv4/ip_forward
>
> on vm I set:
> ifconfig eth0 192.168.10.10 netmask 255.255.255.0
> route add default gw 192.168.10.1
>
> Everything works well ,on vm I can ping 192.168.10.1(vlan1) or
> 192.168.0.238(br0)
> if I set
> vlan1 IP    192.168.0.11
> vm     IP   192.168.0.33 ,gateway 192.168.0.11
> on vm1 I can't ping vlan1 or br0
> I can't set the internal port to the same segment with br0.Why?

Using the same subnet on two different L2 segments is not a very good
idea because Linux pools all IP addresses together as belonging to the
system rather than individual interfaces.  It's likely responding on
either a different interface or with a different address than what you
expect.



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