[OpenSIPS-Users] OpenSIPS mhomed=yes and shared IP address using corosync

Bogdan-Andrei Iancu bogdan at opensips.org
Mon Nov 4 12:28:01 CET 2013

Hi Remco,

OK, if your approach does not work, keep in mind you can still use
local_route to change the outbound socket for the probing OPTIONs.


Bogdan-Andrei Iancu
OpenSIPS Founder and Developer

On 11/02/2013 02:50 PM, Remco . wrote:
> Hi Bogdan,
> Thanks for your reply. The feature of setting the probe interface for
> DR would be great. In the meantime, I studied the exact behavior of
> the IPaddr2 resource agent a bit more. It turns out it uses iproute2
> to bind the address. The VIP is added as a secondary IP address to the
> interface - no wonder the kernel picks the primary. I will see if I
> can modify the resource agent a bit so it will add the VIP as the
> primary IP (swap the IP addresses round). That way, the mhomed=yes
> option will work. I will report back my findings.
> Thanks,
> Remco.
> On Fri, Nov 1, 2013 at 12:27 PM, Bogdan-Andrei Iancu
> <bogdan at opensips.org <mailto:bogdan at opensips.org>> wrote:
>     Hello Remco,
>     In mhomed, yes you let the kernel to pick the source IP based on
>     the routing table - so this approach delegate the logic from
>     OpenSIPS to the kernel. And it is up to ho well the network part
>     is set.
>     In the future I would like to add to the DR module the possibility
>     to set the probing interface (as you have now in the dispatcher
>     module). For now, what you can do is to use the local_route to
>     catch the DR pings and use force_send_socket() to change the
>     outgoing interface.
>     Best regards,
>     Bogdan-Andrei Iancu
>     OpenSIPS Founder and Developer
>     http://www.opensips-solutions.com
>     On 11/01/2013 10:39 AM, Remco . wrote:
>>     Hi all,
>>     I have a clustered OpenSIPS setup (using corosync with a virtual
>>     IP address). This has been working great over the last couple of
>>     years. I now want to add an extra IP address to the boxes, again
>>     floating a VIP over these interfaces. These interfaces will be
>>     used to communicate with PSTN gateways. I noticed however upon
>>     enabling these interfaces, the drouting module starts to ping the
>>     gateways using the wrong source address, i.e
>> = VIP on eth0
>> = VIP on eth1
>>     OpenSIPS is configured to listen on the the two VIPs with a
>>     listen directive.
>>     According to the kernel's routing table, it should use
>>     but it uses which results in failure. As I understood,
>>     mhomed=yes should achieve just this behavior by asking the kernel
>>     for the appropriate source address on sending out a packet.
>>     However, when I enable the mhomed option, OpenSIPS starts to
>>     complain about not having a socket to send out the packets. I
>>     assume this is caused by the kernel returning the real IP from
>>     the interfaces (first) instead of the VIPs.
>>     Just because of the dynamic nature of the interface selection, I
>>     won't be able to use force_send_socket().
>>     I know this question has come up on the list on several
>>     occasions, but nothing recent and I was still wondering if
>>     someone has a workaround or solution for this. I can imagine when
>>     using OpenSIPS as a load-balancer with two interfaces (in and
>>     out) you might encounter this problem as well if you try to add
>>     high availability (in which you often cannot avoid the Virtual IP
>>     scenario).
>>     Thanks,
>>     Remco.
>>     _______________________________________________
>>     Users mailing list
>>     Users at lists.opensips.org <mailto:Users at lists.opensips.org>
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