[SR-Users] AWS binat external -> internal routing and record_route

[Daniel-Constantin Mierla]

On 17.12.18 12:37, Daniel-Constantin Mierla wrote:
> Hello,
>
>
> On 17.12.18 11:38, Dmitry Sytchev wrote:
>> Hi all!
>> I have a question that arises in mailing list sometimes, but it is
>> still not clear for me how to work with this.
>>
>> We have AWS instance with standard Amazon bi-nat, so basically
>> communication with external hosts works with
>> listen udp:ip:port advertise ip:port
>>
>> But in case when we need to send external call to internal network by
>> internal ip addresses, we want to have internal host in record-route.
>> As far as I understand, basic recommendation is to use separate port
>> or internal address and select it with appropriate function.
>>
>> Maybe it is more theoretical question, but can we do something to
>> generate correct record-routes and VIA for calls coming from external
>> network to make their softswitches happy, and still maintain internal
>> address in messages going to internal hosts, using single host and
>> port on Kamailio behind nat?
> you can do also without setting advertise address for a listen socket.
> Just listen on local IP and then you have to use
> set_advertise_address(...) to set the IP in Via and
> record_route_preset(...) to set the Record-Route header.
>
> Only that the config becomes a bit more complex, you have to add IF
> conditions when to add private or public IP addresses there.

One thing I forgot: the public IP has to be treated as local IP (to
match against 'myself'), so you have to do conditions on it -- either
directly in the config conditions, or adding an alias or using domain
module.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla -- www.asipto.com
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