BinTec X4000, Руководство пользователя

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346 X4000 User’s Guide
Configuration of Security Functions and Firewall
10
To do Proceed as follows to define filters and rules:
Filters
➤
Go to
IP
➧
A
CCESS
L
ISTS
➧
F
ILTERS
.
➤
Add a new entry with ADD or select an existing entry and confirm with
Return to change it.
➤
Enter Description.
➤
Select Protocol.
➤
Enter Source Address, if applicable.
➤
Enter Source Mask, if applicable.
➤
Select Source Port.
➤
Enter Specify Port, if applicable.
➤
Enter Destination Address, if applicable.
➤
Enter Destination Mask, if applicable.
➤
Select Destination Port.
➤
Enter Specify Port, if applicable.
➤
Press SAVE.
➤
Repeat these steps until you have defined all the desired filters.
Ensure that you don’t lock yourself out when configuring the filters. For
example, if you link the first filter to a rule that executes Action =
Allow M, only
what you have expressly allowed with the filter actually gets through. It may
easily occur that your telnet access to
X4000 is no longer allowed as soon as
you enter the rule and confirm with SAVE.
■
Do not use any filters on the LAN interface (First Rule =
none) if you access
X4000 via telnet.
■
If you access X4000 via the serial interface or ISDN login, at least nothing
can happen to you during configuration.
Do not forget to define a filter, if necessary, for enabling the remaining data
packets (Protocol =
any, Source Port = any, Destination Port = any).