3Com 3C15500 - Network Director - PC, Руководство пользователя

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654 C
HAPTER
15: P
RIORITIZING
N
ETWORK
T
RAFFIC
Determining Field
Values for
Applications
In order to create a new application definition, it is necessary to know the
field values that can be used to identify that application. Many vendors
now provide the information about the field values that their applications
use either in the application manual or on the vendor’s website to aid
firewall configuration. This information may also be used for creating the
application definition within the Prioritize Network Traffic Wizard.
If you cannot find the information from either the application manual or
the vendor’s website then there are various other websites that may
provide the information that you require. In particular, the IEEE are
responsible for allocating Ethernet type values. A list of the assigned
Ethernet type values can be found on the IEEE website:
http://www.ieee.org/
Similarly, as IANA (Internet Assigned Number Authority) are responsible
for allocating TCP and UDP port numbers, a list of known TCP and UDP
port numbers can be found on the IANA website:
http://www.iana.org/
The IANA website also contains a list of the known IP protocol numbers.
3Com Network
Director Classifier
Rules for NBX Phone
Traffic
When 3Com Network Director configures devices that are capable of
performing complex application classification to identify traffic as NBX
phone traffic it uses classifier rules shown in the following table:
Table 103 NBX Phone Traffic Classifier Rules
Classifier Type Classifier Value Description
Ethernet Type 0x8868 Used by NBX phones to
transmit voice data when
operating in layer-2 mode.
DSCP 46 Used by NBX phones to
transmit voice data when
operating in layer-3 mode.
UDP Port 2093 Used for setting up conference
calls.
Ethernet Type 0x0806 ARP: used to determine the
addresses of phones when
establishing a call.