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430
SEP 2006
Ver. 1.0
DP-8020E/8020P/8016P
9.3.4.
Router
Routers, operating at the OSI Network layer, organize the large network in terms of logical network
segments. Each network segment is assigned an address so that every packet has both a destination
network address and a destination device address.
Routers are more intelligent than bridges. Not only do routers build tables of network locations, but they
also use algorithms to determine the most efficient path for sending a packet to any given network by
identifying its header information.
These are the typical functions:
1.
Routing
This controls the traffic according to a specified routing table.
2.
Packet Filtering
This performs the access and security control for specified routing.
3.
Address Conversion
NAT (Network Address Translator), This performs conversion of a single global IP Address from/to
single private IP Address.
4.
IP Masquerade:
This performs a conversion of single global IP Address from/to multiple private IP Address.
At the same time the port number is automatically assigned.
Occasionally, the conversion creates a bottleneck in the network overhead. For a typical solution, PIX
(Private address Internet address exchange) is available from Cisco, which is a well-known
manufacturer.
5.
Designated Reply
These are reply that keep a connection alive by responding with a signal periodically.
Watch Dog in IPX/SPX, TCP/IP in TCP, and Net BT (NetBIOS on TCP/IP) in Windows NT are all well
known techniques to keep a live connection.
PC-A
192.168.32.1/24
Router B
PC-B
192.168.32.2/24
PC-C
192.168.33.1/24
PC-D
192.168.33.2/24
access-list permit tcp 192.168.32.0 0.0.0.255 192.168.33.1 0.0.0.0 eq 23
OK
OK
permission denied
permission denied
192.168.32/24
Packet Filtering Sample
192.168.33/24
Содержание DP-8020E
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Страница 62: ...62 SEP 2006 Ver 1 0 DP 8020E 8020P 8016P 24 Remove the LCD Holder 520 25 Remove the LCD Module 519 ...
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Страница 185: ...185 SEP 2006 Ver 1 0 DP 8020E 8020P 8016P 3 10 10 MJR PC Board CN22 Refer to FXB PC Board CN25 Refer to FXB PC Board ...
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Страница 467: ...DZSD001829 14 Panasonic Software Operating Instructions Network Firmware Update Tool for Service Technicians Version 3 ...
Страница 482: ...DZSD000965 17 Panasonic Software Operating Instructions Local Firmware Update Tool for Service Technicians Version 3 ...
Страница 493: ...Local Firmware Update Tool Parallel USB Port Page 12 5b4 Firmware Code File selection is completed Click Next ...
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Страница 498: ...Published in Japan ...