PPP to UMTS provider && incoming traffic (TCP, UDP)

[Matthias Apitz]

Hello,

I'm used to connect my FreeBSD 10-CURRENT netbook to Internet via PPP;
the provider in question is a German O2 UMTS provider; so far so good,
i.e. all is working as it should: outbound HTTP, SSH, SMTP (I'm just
sending this mail through such a connection), ...

what does not work is VoIP; the call is established via SIP (using a
STUN server), but remote audio RTP packages are not coming down; I
checked this with TCPDUMP: only upstream RTP is send, no incoming UDP;

as well I checked incoming TCP, for example incoming SSH or HTTP; it
seems that incoming UCP/TCP is just not coming through the PPP link;

before bother (complain) the provider with this, I wanted to ask if I
miss something in the PPP configuration to get incoming delivered;

note: I'm not talking about NAT to some stations on a LAN, I just want
get IP to the local host (interface tun6); as well I disabled ipf(8)
which I have configured normaly;

any ideas? thanks in advance

	matthias
-- 
Matthias Apitz
e <guru at unixarea.de> - w http://www.unixarea.de/
UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5