[OpenSIPS-Users] multiple interfaces + load_balancer probing and mhomed=0

[Răzvan Crainea]

Hi, Jennifer!

Unfortunately there is no way to change the pinging behavior. If you say 
tht pinging works with mhomed on, I think we should focus on fixing 
routing when it is enabled.
Did you try to "fix" the reply interface by using force_send_socket()?

Best regards,

Răzvan Crainea
OpenSIPS Solutions
www.opensips-solutions.com

On 05/11/2017 09:28 PM, Jennifer Hashimoto wrote:
> Hello,
> I’m hoping someone can help me with this problem.
>
> I have an opensips 2.2.2 server that has 3 interfaces listening on debian
>
> Debian has 2 default routes in 2 different routing tables such as is 
> described here 
> https://www.thomas-krenn.com/en/wiki/Two_Default_Gateways_on_One_System
>
> I have put mhomed=0 as I do not need to route from one interface to 
> another - and if i enable mhomed it does not work.
> With mhomed off, it sends the reply out the same interface that it 
> came in as I want.
> With mhomed on it seems to look into the default routing table and 
> find a route, then decide which interface to used based on that - it 
> does not use the ip rules to figure out which routing table it should 
> use (ie. ip rule and then ip route list table rt2)
>
> The reason for all this madness is i have 2 separate internet feeds 
> going through 2 separate routers. If a call comes in one of the 
> routers, I want to send it back to the same router and to it’s 
> internet feed. (so that we have symmetrical routing and nat etc works 
> also so we can maintain redundancy in case one feed goes down)
>
> My issue is that while everything works great with mhomed off, 
> load_balancer pinging seems to randomly decide which interface to use, 
> even if i specify a from address.
> modparam("load_balancer", "probing_from", “sip:pinger at 10.10.10.10")
>
> The from address is always correctly populated when I look at the SIP 
> message , but the source_ip varies. sometimes it is the ip of the from 
> address, and sometimes it is another ip on the box. The IP it chooses 
> is not always routable by the destination so it disables the destination.
>
> Is there a way to specify which interface/ip i want it to probe from?
>
> (when i put mhomed=1 probing works, but then actually sending traffic 
> doesn’t work as it only looks in the default routing table for a route 
> to determine which interface to use.)
>
> Thanks,
>
> Jennifer Akemi
>
>
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