4-12
Therefore packet filtering simply defines sets of rules of what to allow or disallow
through a set of parameters highlighted below:
For IP,
remote devices with IP addresses/port numbers
are allowed (or disallowed) to communicate with
local devices with IP addresses/port numbers over
a WAN connection and using a specific IP protocol.
For IPX,
remote devices with IPX network numbers/nodes/sockets
are allowed (or disallowed) to communicate with
local devices with IPX network numbers/nodes/sockets over
a WAN connection.
Examples of packet filtering requirements are:
1.
“
I want to block any user in my remote office from being able to access my
local NetWare server
”.
The corresponding “translated” packet rule is:
All IPX communication with my remote office is allowed EXCEPT
remote devices with
Any IPX network number
and
Any IPX node number
and
Any IPX socket
which are
disallowed
from communicating with the local
NetWare server (identified by its
IPX network number
,
IPX Node Number
and
Any socket number
over
my specified remote office connection profile
Protocol
Condition
Parameter
Configuration
Formats
IP
Protocol
TCP/UDP/
ICMP/IGMP/
Any
Address
Single/Range/
Network/Any
Port
Single/Range/
Any
IPX
Packet Type
Single/Any
Network
Number
Single/Range/
Any
Node Number
Single/Any
Socket
Single/Range/
Any
Содержание Wireless Router
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