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Re: [Linphone-users] Strange Linphone Failure

From: Robert Dixon
Subject: Re: [Linphone-users] Strange Linphone Failure
Date: Sat, 8 Jun 2019 14:34:51 -0400

I changed both PCs to a different switch and router. No internet connection.
addresses are now 10.176.*.*
No change in behavior.
I could disable IPv6, but I doubt that is in play here.

Thanks for your help!


> On Jun 8, 2019, at 1:41 PM, Stuart D. Gathman <address@hidden> wrote:
> On Sat, 8 Jun 2019, Robert Dixon wrote:
>> IPv4
>> Private IPs.   192.168.*.*
> I've only verified this for private IPv6, but one of the underlying libraries 
> changed early this year to become rather prejudiced against
> private IPs.  If any routable public IPs are available, it will try
> to use those for SIP responses - ignoring the private IP you told it
> to use.  If the public IP is actually routed to your destination (not
> likely for your private IP4s, more likely for private IPv6), and
> is allowed through firewalls, well and good (except if you
> were counting on a VPN to encrypt things).  Otherwise, the call
> setup fails, or works briefly before failing.
> I haven't tested with IP4 (it's been obsolete for 15 years), but I
> suspect the same thing happens with private IP4.
> The work-around for me is to disable IP6 on the public (non-vpn) interfaces 
> during the call.  That is likely more difficult for you,
> as your VPN probably doesn't support layer 2 connections, and relies
> on public IP4s to send/recv VPN packets.
> If your private IP4s are assigned by a router, and you have no public
> IPs on the PCs - then your problem is likely with router or firewalls
> instead.
> -- 
>             Stuart D. Gathman <address@hidden>
> "Confutatis maledictis, flamis acribus addictis" - background song for
> a Microsoft sponsored "Where do you want to go from here?" commercial.
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> Linphone-users mailing list
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