ZyXEL Communications Prestige 791R, User Manual

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Prestige 791R G.SHDSL Router
Select Forward here so that the packet will be forwarded if
its destination is not the telnet port and there are no more
rules in this filter set to check. Select Next if there are
more rules to check.
Select Drop here so that the
packet will be dropped if its
destination is the telnet port.
There are no
more rules to
check.
Select Equal here
as we are looking
for packets going
to port 23 only.
The port number for the telnet
service (TCP protocol) is 23 . See
RFC-1060 for port numbers of well-
known services.
6 is the TCP protocol.
Select Yes to make the rule active.
Press [SPACE BAR] to choose this
filter rule type. The first filter rule
type determines all subsequent filter
types within a set.
Menu 21.3.1 - TCP/IP Filter Rule
Filter #: 3,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 6 IP Source Route= No
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 23
Port # Comp= Equal
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #=
Port # Comp= None
TCP Estab= No
More= No Log= None
Action Matched= Drop
Action Not Matched= Forward
Press ENTER to Confirm or ESC to Cancel:
Figure 12-17 Sample Filter Rules Summary — Menu 21.3.1
After you have created the filter set, you must apply it.
Step 1. Enter 11 in the main menu to display menu 11 and type the remote node number to edit it.
Step 2. Go to the Edit Filter Sets field, press [SPACE BAR] to choose Yes and press [ENTER] .
Filter Configuration 12-19