The matching of packets by rules is connection-based, known as Stateful Packet
Inspection (
), using the Router's firewall mechanism. Once a packet matches a
SPI
rule, all subsequent packets with the same attributes receive the same
eters, both inbound and outbound. Connection-based
o
parameters by some of the applications that open subsequent connections.
Q
S
For instance,
o
Q
S
trol and data ports (even if the data ports are unknown). Applications that support
such inheritance have an
•
SIP
•
Messenger/Windows Messenger
MSN
•
TFTP
•
FTP
•
MGCP
•
.323
H
• Port triggering applications
•
PPTP
•
ec
IPS
Actiontec Broadband Router User Manual
rules can be defined on
in the firewall. They are:
ALG
o
Q
, and the rules will apply to both con-
SIP
122
o
param-
Q
S
also allows inheriting
S