-- Original Message --
From : Damien Sandras
A lot of people are using SIP with my provider with both
phones and soft phones
[...]
Perhaps they simply don't use stun at all ?
They simply use different stun servers with Ekiga.net and/or other SIP
providers/services, and sometimes they also use other SIP accounts without
STUN support.
We know that stun.ekiga.net <-> stun.voxgratia.org = IP Address 83.103.82.85
.
Such IP Address belongs to a public subnet assigned from FASTWEB to a
corporate customer, as You can check on RIPE Whois DB :
==
----------------------------------------------------------------
inetnum: 83.103.82.80 - 83.103.82.95
netname: FASTWEB-Reitek
descr: Reitek public subnet
country: IT
admin-c: GC4384-RIPE
tech-c: IRS2-RIPE
status: ASSIGNED PA
mnt-by: FASTWEB-MNT
----------------------------------------------------------------
FASTWEB users mainly have a Hidden/Dynamic NAT M-1 connection towards
Internet, but they don't have to go outside FASTWEB network in order to
connect to stun.ekiga.net ;).
Therefore stun.ekiga.net directly 'sees' the MAN private IP from which the
packets are originated = it identifies such IP as an External one, even
though the MAN IP Address is unreachable from Internet users (because of NAT
Architecture).
There isn't indeed any NAT between Marco's endpoint and the stun server =
NAT socket creation fails & Contact-Field always show the MAN IP as You can
see from his logs :
==
----------------------------------------------------------------
Initial interface list:
127.0.0.1 [00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:01]
<00-00-00-00-00-00> (lo)
5.255.56.38 [fe:80:00:00:00:00:00:00:02:22:15:ff:fe:22:b9:8c]
<00-22-15-22-B9-8C> (eth0)
[...]
STUN server "stun.ekiga.net" replies Open NAT, external IP 5.255.56.38
[...]
Cannot create socket using NAT type Open NAT
Created bundled UDP socket 5.255.56.38:5060
[...]
Contact: <sip:[EMAIL PROTECTED]:5060;transport=udp>
----------------------------------------------------------------
Marco couldn't use STUN with his FASTWEB connection, but in such case he
should have a client+service, that uses also the private/NAT addresses from
which the IP packets are originated instead of that one supplied in the SIP
protocol.
If I'm not wrong, You are not doing so on Ekiga.net because it would only
work with special numbers but not with other users, and so people would have
the wrong impression that everything is setup correctly when it is not the
case.
Therefore I suggest that Marco should go on using his Ekiga.net account with
STUN support, but with a different server = stun servers outside from
FASTWEB network will 'see' his connections incoming from the NAT-R Public IP
Address & will recognize it as the external IP :
==
* http://www.voip-info.org/wiki/view/STUN
-----------------------------------------
- stun.fwdnet.net (no XOR_MAPPED_ADDRESS support)
- stun.ideasip.com (no XOR_MAPPED_ADDRESS support)
- stun01.sipphone.com (no DNS SRV record)
- stun.softjoys.com (no DNS SRV record) (no XOR_MAPPED_ADDRESS support)
- stun.voipbuster.com (no DNS SRV record) (no XOR_MAPPED_ADDRESS)
- stun.xten.com
- stunserver.org
- stun.sipgate.net:10000
- numb.viagenie.ca (XOR_MAPPED_ADDRESS with rfc3489bis magic number ID)
In case You should need it, this is the full-updated map of FASTWEB MAN
Private IP Addresses = as You can see, FASTWEB is using (or better abusing)
of Unallocated/Reserved IANA Ranges and also has some overlapping with
Public Assigned/Allocated Ranges :
==
----------------------------------------------------------------
MAN Milano - IP 1.x.x.x
MAN Milano Hinterland NORD - IP 2.x.x.x
MAN Genova - IP 5.x.x.x
MAN Trento/Veneto - IP 11.x.x.x -> May 93 DoD Intel Information
Systems
MAN Milano Hinterland SUD - IP 14.x.x.x -> Feb 08 switched from IANA PDN
to IANA Reserved
MAN Marche - IP 21.x.x.x -> Jul 91 DDN-RVN
MAN Grosseto - IP 22.x.x.x -> May 93 Defense Information
Systems Agency
MAN Roma - IP 23.x.x.x
MAN Toscana - IP 27.x.x.x
MAN Biella/Torino - IP 28.x.x.x -> Jul 92 DoD Network Information
Center
MAN Triveneto - IP 29.x.x.x -> Jul 91 Defense Information
Systems Agency
MAN Bari - IP 31.x.x.x
MAN Sicilia - IP 36.x.x.x
MAN Bologna - IP 37.x.x.x
MAN Napoli - IP 39.x.x.x
MAN Torino - IP 41.x.x.x -> Apr 05 AfriNIC (moving users
to 28.x.x.x)
MAN Reggio Emilia - IP 42.x.x.x
MAN Sardegna - IP 51.x.x.x -> Aug 95 Deparment of Social
Security of UK
----------------------------------------------------------------
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