Actiontec MI424WR (GigE) User Manual
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Actiontec Wireless Broadband Router User Manual
153
Appendix A Quality of Service
The matching of packets by rules is connection-based, known as Stateful Packet
Inspection (
SPI
), using the Router’s firewall mechanism. Once a packet matches a
rule, all subsequent packets with the same attributes receive the same
Q
o
S
param-
eters, both inbound and outbound. Connection-based
Q
o
S
also allows inheriting
Q
o
S
parameters by some of the applications that open subsequent connections.
For instance,
Q
o
S
rules can be defined on
SIP
, and the rules will apply to both con-
trol and data ports (even if the data ports are unknown). Applications that support
such inheritance have an
ALG
in the firewall. They are:
•
SIP
•
MSN
Messenger/Windows Messenger
•
TFTP
•
FTP
•
MGCP
•
H
.323
• Port triggering applications
•
PPTP
•
IPS
ec