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Hi Ravi ,

I would suggest ,

[1] Use Ubuntu cloud images from "
http://cloud-images.ubuntu.com/trusty/current/" , so you can do ssh login
and enable ipv4 forwarding  by changing "net.ipv4.ip_forward = 1" in file
/etc/sysctl.conf

[2]  In case of basic cirros image  please add some static route as  Jim
suggested  or run some simple c socket program using gcc to forward packets.

Thanks.,
Mohankumar.N

On Thu, Aug 18, 2016 at 12:52 PM, 张广明 <gmzhang76 at gmail.com> wrote:

> Ravi:
>    If you only want to let the VM-SF to forward traffic from p2 to p3,
>  you can enable ip_forward in VM-SF and configure two static route in
> VM-SF.
>    Eg :ip route add VM-DST dev p2
>         ip route add VM-SRC dev p1
>
> Jim
>
> 2016-08-18 8:02 GMT+08:00 Ravi Sekhar Reddy Konda <
> ravisekhar.konda at oracle.com>:
>
>> Hi Networking SFC team
>>
>> I need some help in using the openstack Networking-SFC for service
>> chaining.
>>
>>  I am trying out Openstack networking-SFC on the devstack VM.
>>  I brought up AllInOne Devstack(master branch) on the Ubuntu VM on the
>> VirtualBox.
>>  I am trying out the following scenario
>>
>>   |--------------|                                 |--------------|
>>                                 |--------------|
>>   | VM-SRC  |                                 |   VM-SF
>> |                                       |  VM-DST |
>>   |--------------|
>> |--------------|                                       |--------------|
>>         p1 |                                            p2 |
>> |p3                                           p4 |
>>              |                                                 |
>> |                                                    |
>>              |                                                 |
>> |                                                    |
>> Net1--------------------------------------------------------
>> -------------------------------------
>>
>>
>> I am using  "cirros-0.3.4-x86_64-uec" image for bringing up VM-SRC,
>> VM-DST and VM-SF
>>
>> I got struck in enabling the "cirros-0.3.4-x86_64-uec" VM for forwarding
>> the packets coming from Ingress-Port(p2) to Egress-Port(P3)
>> I think we can use IPTables rules for enabling VM to forward packets from
>> Ingress-Port to Egress-Port, but the basic cirros-0.3.4-x86_64-uec
>> image does not contain IPTables also,  I tried to enable external
>> connectivity for the VM using Floating-IP, I am able to ssh to "VM-SF" from
>> devstack VM using
>> floating-IP, but not able to connect to to external world from VM-SF, and
>> I could not even find yum-install on the cirros-0.3.4-x86_64-uec image for
>> installing.
>>
>> I want to know if there is any VM with minimal footprint(like UFM) which
>> can be brought up on the virtualBox setup to act as Service Function which
>> enables forwarding.
>> Also can anybody give me the steps how to make cirros-0.3.4-x86_64-uec
>> image to act as Service Function for forwarding traffic.
>>
>> Thanks in Advance
>> Ravi
>>
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