Re: [Astlinux-users] Guidance on configuring NAT on Astlinux

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Hi Michael

Thanks for that but you misunderstand sorry. 
Astlinux is on the edge and a SIP PBX is on the inside that will eventually be replaced.

Regards
Michael Knill

-----Original Message-----
From: Michael Keuter <li...@mk...>
Reply-To: AstLinux List <ast...@li...>
Date: Tuesday, 5 September 2017 at 6:20 pm
To: AstLinux List <ast...@li...>
Subject: Re: [Astlinux-users] Guidance on configuring NAT on Astlinux

> Am 05.09.2017 um 09:16 schrieb Michael Knill <mic...@ip...>:
> 
> Hi group
>  
> I have a bit of a tricky one that I want to run past the Astlinux firewall experts.
>  
> Scenario:
> An existing PBX (soon to be replaced) using an existing SIP Provider sitting BEHIND an Astlinux appliance which is connected to another SIP Provider.
>  
> Should I just be able to do NAT EXT -> LAN to the internal PBX for 5060 & Media Ports using the Source IP Addresses of their current provider? Or do I need to add something in NAT EXT: ?
> I just recall that I had issues with Astlinux and forwarding 5060 but that was a while ago.
>  
> Thanks.
>  
> Regards
> Michael Knill

Hi Michael,

I had the same issue. It is quite easy:

On the PBX behind the main AstLinux box set in sip.conf:

; NAT settings
externaddr=xx.xx.xx.xx:5062 ; this tells the second provider to send the returning packets to port 5062!
localnet=yy.yy.yy.yy/255.255.255.0
nat=force_rport,comedia

Then on the main AstLinux box set NAT EXT -> LAN port 5062 to the IP of the 2nd PBX but on port 5060!
Then just use different RTP ports then on the edge box. 

Michael

http://www.mksolutions.info

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