[SR-Users] double_rr issues

[Daniel-Constantin Mierla]

Hello,

check the routing rules/table of the operating systems, there should be
some differences between the two servers.

If you mhomed=1 and an unexpected interface is used for routing out the
traffic, it means that operating system has internal routing rules that
allow going from that interface to the target address.

Cheers,
Daniel

On 28.02.19 09:24, Roman Dissauer wrote:
> Hi,
>
> /* uncomment and configure the following line if you want Kamailio to
>  * bind on a specific interface/port/proto (default bind on all available) */
> # listen=udp:10.0.0.10:5060
> mhomed=1
>
> even this config is the same. I do not bind on specific interface since doc says that if there is no listen, kamailio will bind on all interfaces…
> strange thing… if I explicitly set listeners for tcp and udp on all IP addresses it works!
>
> I have a dozen kamailios out there, all in mhomed=1 config. On every single one double_rr works without setting any listen parameters, only on this particular one machine in a separate datacenter it didn’t work.
>
> Thanks for the hint!
> Roman
>
>> Am 27.02.2019 um 22:24 schrieb Alex Balashov <abalashov at evaristesys.com>:
>>
>> Does Kamailio have listeners (listen= on both interfaces)? What is the value of the ‘mhomed’ setting?
>>
>> These nuances surely differ between the two hosts.
>>
>> —
>> Sent from mobile, with due apologies for brevity and errors.
>>
>>> On Feb 27, 2019, at 4:14 PM, Roman Dissauer <roman at dissauer.net> wrote:
>>>
>>> I’m experiencing issues with kamailio 5.1 in multihomed config:
>>>
>>> two machines, latest debian stretch, latest kamailio 5.1, exactly same config (verified with diff)
>>> both machines have an internal and an external network interface. Only thing different is that they are in different datacenters.
>>>
>>> on one machine everything works perfect, on outgoning calls rr parameters are added perfectly right:
>>> Record-Route: <sip:yy.yy.yy.yy;transport=tcp;r2=on;lr;nat=yes>
>>> Record-Route: <sip:xx.xx.xx.xx;transport=tcp;r2=on;lr;nat=yes>
>>>
>>> where yy.yy.yy.yy is the external ip and xx.xx.xx.xx is the internal IP
>>>
>>> on the other machine I only get:
>>> Record-Route: <sip:xx.xx.xx.xx;transport=tcp;lr;nat=yes>
>>>
>>> even if I set enable_double_rr to 2 I get:
>>> Record-Route: <sip:xx.xx.xx.xx;transport=tcp;r2=on;lr;nat=yes>
>>> Record-Route: <sip:xx.xx.xx.xx;transport=tcp;r2=on;lr;nat=yes>
>>>
>>> I already checked with traceroute that the routing to the destination IP Adresses are going through the external interface.
>>>
>>> maybe someone has a hint for me.
>>>
>>> Thank you all in advance!
>>> Roman
>>>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
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