Wireshark-bugs: [Wireshark-bugs] [Bug 5055] wrogn decoding of GTP Prime (GTP') Packets
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5055
--- Comment #3 from Anders Broman <anders.broman@xxxxxxxxxxxx> 2010-07-28 00:47:04 PDT ---
As it's not possible to distinguish a GTPv2 header from a GTPv2' header the
code
has to be rearanged to have different entry points for the assigned ports one
for GTP and one for GTP'.
TS 32.295 version 9.0.0 Release 9:
5.1.3 Port usage
Transporting the CDRs from the CDFs to the CGF over the Ga reference point may
facilitate charging.
The Path Protocol may be UDP (compliant with STD 0006[404]) or TCP (compliant
with STD 0007[405]) over IP.
• UDP as the Path Protocol
Ports for signalling the request messages:
- The UDP Destination Port may be the server port number 3386 which has been
reserved for GTP'.
Alternatively another port can be used, which has been configured by O&M,
except Port Number 2123
which is used by GTPv2-C.
- The UDP Source Port is a locally allocated port number at the sending network
element.
NOTE: UDP Source Port number should be different than UDP Source Port number
allocated to GTPv2 (see TS
29.274 [201]).
Ports for signalling the response messages:
- The UDP Destination Port value shall be the value of the Source Port of the
corresponding request
message.
- The UDP Source Port shall be the value from the Destination Port of the
corresponding request message.
• TCP as Path Protocol
The TCP Destination Port may be the server port number 3386, which has been
reserved for G-PDUs. Alternatively,
another port may be used as configured by O&M. Extra implementation-specific
destination ports are possible but
all CGFs shall support the server port number.
The TCP Source Port is a random port, locally assigned at the sending network
element.
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