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

[Joel Serrano]

Hello Dmitry,

I was wondering if you got this working? I'm facing a similar scenario and
I don't know if it's worth going this path vs having a second port on
internal IP without advertise just for internal traffic.... ?

Thanks,
Joel.

On Mon, Dec 17, 2018 at 3:55 AM Dmitry Sytchev <kbdfck at gmail.com> wrote:

> Yes, I'm handling external IP with domain module, so I'm matching it
> as 'myself'.
> I'll try to do it this way.
>
> Thank you, Daniel!
>
> пн, 17 дек. 2018 г. в 14:49, Daniel-Constantin Mierla <miconda at gmail.com>:
> >
> >
> > 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
> > www.twitter.com/miconda -- www.linkedin.com/in/miconda
> > Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
> > Kamailio Advanced Training - Mar 4-6, 2019 -- www.asipto.com
> >
>
>
> --
> Best regards,
>
> Dmitry Sytchev,
> IT Engineer
>
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