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If your eth0 (public interface) can access Internet, with the ip_forward
your instance should be able too...


On Wed, Aug 8, 2012 at 12:05 PM, Leander Bessa Beernaert <
leanderbb at gmail.com> wrote:

> So i have set up a small proof of concept, one controller node and two
> compute nodes. Since the switches do not support VLAN i'm using flat dhcp.
> Each machine has two network interfaces. Eth0 is connected to the public
> switch and eth1 to the private switch. The private switch has no access to
> the internet.
>
> Both compute nodes have the value of cat /proc/sys/net/ipv4/ip_forward set
> to 1. However, i still can't make an instance connect to the outside.
>
>  Any thoughts?
> On Tue, Aug 7, 2012 at 11:32 PM, Sébastien Han <han.sebastien at gmail.com>wrote:
>
>> It's part of the operating system
>>
>> # echo 1 > /proc/sys/net/ipv4/ip_forward
>>
>> Then edit your /etc/sysctl.conf and uncomment net.ipv4.ip_forward=1 to
>> make this persistent after reboot.
>>
>> Finally run --> # sysctl -p
>>
>> That's all, cheers!
>>
>>
>> On Tue, Aug 7, 2012 at 11:50 PM, Leander Bessa Beernaert
>> <leanderbb at gmail.com> wrote:
>> > Is there a flag in the nova.conf file or is this something that needs
>> to be
>> > done on the operating system?
>> >
>> >
>> > On Tue, Aug 7, 2012 at 8:26 PM, Sébastien Han <han.sebastien at gmail.com>
>> > wrote:
>> >>
>> >> Hi,
>> >>
>> >> If eth0 is connected to the public switch and if eth1 is connected to
>> >> the private switch you can enable the ipv4 forwarding on the compute
>> >> node. Thanks to this the VMs will have access to the outside world and
>> >> the packet will be routed from eth1 to eth0 :).
>> >>
>> >> Cheers!
>> >>
>> >> On Tue, Aug 7, 2012 at 5:18 PM, Leander Bessa Beernaert
>> >> <leanderbb at gmail.com> wrote:
>> >> > Hello,
>> >> >
>> >> > I have a question regarding the use of two network interfaces.
>> According
>> >> > to
>> >> > the official documentation, one of the interfaces is used for public
>> >> > access
>> >> > and the other for internal access (inter-vm communication). What i'd
>> >> > like to
>> >> > know is how does an instance connect to the outside world (internet
>> >> > access)?
>> >> > Is it done through the switch connected to the private interface or
>> the
>> >> > public interface?
>> >> >
>> >> > --
>> >> > Cumprimentos / Regards,
>> >> > Leander
>> >> >
>> >> > _______________________________________________
>> >> > Mailing list: https://launchpad.net/~openstack
>> >> > Post to     : openstack at lists.launchpad.net
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>> >> >
>> >
>> >
>> >
>> >
>> > --
>> > Cumprimentos / Regards,
>> > Leander
>>
>
>
>
> --
> Cumprimentos / Regards,
> Leander
>
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