[OpenSIPS-Users] Load balancer behind NAT

[Jose Suero]

First of all thanks a lot for your reply, both servers have only one 
interface, they're getting internet thru a NAT, each is assign an 
external IP on the NAT.

ext-rtp-ip is set on the profile, in fact if I connect to freeswitch 
directly it works fine, but not from opensips.

I'm trying not to use RTP Proxy because I don't want all the calls to 
have to go thru the opensips server.

I'm using Debian 7 on both servers, NAT is provided by EC2 so I have no 
control over it.

I tried the fix_nated_sdp method on opensips and it works, the only 
problem is that I have to specify the external IP address of the FS 
server like fix_nated_sdp("1","123.123.123.123"), if I don't I get:

ERROR:nathelper:fix_nated_sdp_f: Unable to get bodies from message

This is a problem if I have 2 (or more) FS servers since I don't know 
which address I need to rewrite it to.

any ideas??

thanks again for your help

On 2013-08-01 00:57, Muhammad Shahzad Shafi wrote:
> I think your opensips would have two interfaces, one for public ip,
> from where the client request comes in and one on private ip to send
> call to FS.
>
> Now, since call is come to FS from local LAN (private ip of
> opensips), therefore, it will most likely won't any NAT adjustments
> for it, resulting in media flow failure. So,
>
> 1. Is this assumption correct or your architecture is more complex 
> then this?
> 2. How does FS connects to internet, does you have different gateway
> to internet for FS compare to opensips?
>
>
> If any or both question is yes, then you can either,
>
> 1. Try using ext-rtp-ip parameter in sofia profile,
>
> http://wiki.freeswitch.org/wiki/Sofia.conf.xml#ext-rtp-ip
>
> 2. You can also change rtp ip in sdp on opensips using fix_nated_sdp 
> method.
>
> 3. If your internet gateway is running fairly recent version of linux
> kernel >= 3.x then loading sip nat kernel module will also do the
> trick, (but its not guaranteed to work in all distros, i can only
> confirm it in ubuntu 12.x+ and debian 7.x+).
>
> modprobe -r ip_nat_sip
> modprobe -r ip_conntrack_sip
>
> 4. Install rtpproxy and enable it in opensips in bridged mode.
>
>
> For solution 1 - 3, port forwarding must be enabled on your FS's
> internet gateway.
>
> Thank you.
>
>
> On 2013-08-01 03:49, Jose Suero wrote:
>> Some aditional info,
>>
>> I'm trying not to use RTPProxy for this, so I can have the load on
>> freeswitch servers as opposed to have all calls (RTP) on the 
>> opensips
>> server.
>>
>> Any help would really be appreciated, i've searched all day with no 
>> luck
>>
>> thanks in advance
>>
>> On 2013-07-31 13:52, Jose Suero wrote:
>>> Hello all
>>>
>>> I'm trying to setup opensips as proxy/loadbalancer for freeswitch,
>>> following
>>> http://wiki.freeswitch.org/wiki/Enterprise_deployment_OpenSIPS
>>>
>>> right now I'm able to register to opensips which sends the
>>> registration to freeswitch, and when I dial a number it goes to
>>> freeswitch and gets dialed, the problem is that the phone tries to
>>> connect to freeswitch server's internal IP.
>>>
>>> If I connect to freeswitch directly everything works fine, 
>>> freeswitch
>>> advertises correct NAT address, but not thru opensips
>>>
>>> I'm using dispatcher for registration and LoadBalancer with this 
>>> script
>>>
>>>        if (is_method("INVITE")) {
>>>                 if (!load_balance("1","pstn","1")) {
>>>                         send_reply("503","Service Unavailable");
>>>                         exit;
>>>                 }
>>>         }
>>>         else if (is_method("REGISTER")) {
>>>                 if (!ds_select_dst("1", "0")) {
>>>                         send_reply("503","Service Unavailable");
>>>                         exit;
>>>                 }
>>>         }
>>>
>>>
>>>
>>> thanks in advance
>>>
>>> Jose Suero
>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>>
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