[SR-Users] How ICE works with private IPs as candidates?

[Arsen]

Hi Denys,

It is nothing unusual to see private ip address in the ICE candidate list.
rfc5245 : "Naturally, one viable candidate is a transport address obtained
directly from a local  interface."

Here you can find more info:
https://tools.ietf.org/html/rfc5245#section-2.1

On Fri, Apr 21, 2017 at 11:46 AM, Denys Pozniak <denys.pozniak at crazycall.com
> wrote:

> Hello!
>
> I have next topology: ISP->Kamailio + Rtpengine->WebRTC
> Sometimes I receive from Browser side SDP like below with private IPs in
> ICE candidates.
>
>    - Please explain why it happens?
>    - How ICE finds a pair? I think Rtpengine obtains packet from Browser
>    and somehow matches with peer (as it can't reach Browser via private IP)
>
>
>
> U KAMAILIO_IP:34150 -> RTPENGINE_IP:22222
> 0_16586_545 d3:sdp962:v=0.
> o=- 3981552194926701250 2 IN IP4 127.0.0.1.
> s=-.
> t=0 0.
> a=msid-semantic: WMS 5efe361e-087d-47de-98f6-9b51427d3764.
> m=audio 50589 RTP/SAVPF 8 0.
> c=IN IP4 192.168.2.205.
> a=rtcp:9 IN IP4 0.0.0.0.
> a=candidate:710145796 1 udp 2122255103 <(212)%20225-5103>
> 2001::9d38:6abd:3c21:28f:3f57:fd32 50588 typ host generation 0 network-id
> 1 network-cost 50.
> a=candidate:2355154215 1 udp 2122194687 <(212)%20219-4687> 192.168.2.205
> 50589 typ host generation 0 network-id 2.
> a=ice-ufrag:sPAh.
> a=ice-pwd:RjXqOz8rpwjhKPU3BzXkJd1d.
> a=fingerprint:sha-256 04:AF:D4:6C:07:C2:DD:18:48:E0:
> BC:46:15:15:00:5F:C9:AD:CF:8D:F3:94:55:5A:54:0C:37:B3:E6:44:63:EC.
> a=setup:active.
> a=mid:audio.
> a=sendrecv.
> a=rtcp-mux.
> a=rtpmap:8 PCMA/8000.
> a=rtpmap:0 PCMU/8000.
> a=ssrc:3055599516 <(305)%20559-9516> cname:n0Cdw7SNbYDIba8s.
> a=ssrc:3055599516 <(305)%20559-9516> msid:5efe361e-087d-47de-98f6-9b51427d3764
> 41750b25-d640-4bad-8953-55f4e2684c49.
> a=ssrc:3055599516 <(305)%20559-9516> mslabel:5efe361e-087d-47de-98f
> 6-9b51427d3764.
> a=ssrc:3055599516 <(305)%20559-9516> label:41750b25-d640-4bad-8953-
> 55f4e2684c49.
> 3:ICE6:remove5:flagsl13:trust-address14:media-handover8:SDES
> -offe7:replacel6:origin18:session-connectione18:transport-
> protocol7:RTP/AVP8:rtcp-muxl5:offer6:accepte7:call-id37:
> domain.com_29465313:received-froml3:IP412:10.23.255.93e8:
> from-tag13:QQcg5eFv08S9K6:to-tag10:nsebpmf7ia7:command6:answere
>
>
>
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>
>


-- 
Regards,

Arsen Semionov
Eurolan.info
cell: +442035198881
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