[SR-Users] Kamailio & rtpproxy with more than one external IP interfaces

[David Villasmil]

Hello,

In terms of private/public IP addresses,in kamailio you would need to
"advertise" the public IP address, such that:

listen=udp:192.168.0.10:5060 ADVERTISE 123.123.123.123:5060

So kamailio, when sending out, utilises that public (advertise) IP address
as its own address.
I don't know of any mechanism that allows you to set two different public
IP addresses as advertised addresses.

You _can_ receive  from multiple public IPs by setting multiple aliases,
like:

alias=123.123.123.123:5060
alias=213.213.213.213:5060

and kamailio would process them as its own IPs.
But when sending out, it will use the ADVERTISED address.

So the correct thing to do is to have multiple private address mapped
one-to-one to public ip address, i.e.:

listen=udp:192.168.0.10:5060 ADVERTISE 123.123.123.123:5060
listen=udp:192.168.0.20:5060 ADVERTISE 213.213.213.213:5060

This _would_ work properly.

Regards,

David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337


On Wed, Apr 22, 2020 at 7:04 PM Leonid Fainshtein <
leonid.fainshtein at xorcom.com> wrote:

> Can you elaborate a little? I didn't understand you.
> Best regards,
> Leonid
>
>
>
> On Wed, Apr 22, 2020 at 6:53 PM David Villasmil <
> david.villasmil.work at gmail.com> wrote:
>
>> I think mapping IPs is a one-to-one relationship
>>
>> On Wed, 22 Apr 2020 at 16:18, Leonid Fainshtein <
>> leonid.fainshtein at xorcom.com> wrote:
>>
>>> Hi,
>>> My server has several external IP interfaces and one internal interface.
>>> For some calls I would like to handle RTP via Ext1<->Int interfaces and for
>>> other calls: via Ext2<->Int.
>>> In order to achieve this,  I don't define the '-l' rtpproxy parameter,
>>> and depending on the call, I set the required IP address as a parameter of
>>> rtpproxy_manage().
>>> I didn't succeed to get the desired result.
>>> On my testbed, I have the following interfaces:
>>> Ext1: 192.168.0.31
>>> Ext2: 192.168.0.32
>>> Int:     10.159.65.1
>>>
>>> When I try to create Ext2<->Int (192.168.0.32<-> 10.159.65.1), the
>>> packets that accepted on the internal interface are sent out from the
>>> Ext1(192.168.0.31) instead of Ext2 (192.168.0.32). It looks like the
>>> decision about the source address is made based on the IP routing table
>>> information (?).
>>> Also, I would like to have an advertised address for at least one
>>> external interface.
>>>
>>> Is it achievable with just one instance of rtpproxy? Or, it is necessary
>>> to run two rtpproxies in the bridged mode wit configured advertize
>>> addresses?
>>>
>>> Thank you in advance,
>>> Leonid
>>>
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing List
>>> sr-users at lists.kamailio.org
>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>> --
>> Regards,
>>
>> David Villasmil
>> email: david.villasmil.work at gmail.com
>> phone: +34669448337
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
> _______________________________________________
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