Planet-technology G.SHDSL.bis Bridge Router GRT-504 Instrukcja Użytkownika Pobierz pdf (Strona 18)

GRT-504 4-Wire G.SHDSL.bis Firewall Router User’s Manual

Internet

192.168.0.10

192.168.0.11

192.120.8.5

Firewall

Internal/Protected Network External/Unprotected Network

NAT (Network Address Translation)

192.168.0.10

192.168.0.11

192.120.8.5

Internal IP External IP

Internet

192.168.0.10:1025

192.168.0.11:4406

192.120.8.5

Firewall

Internal/Protected Network External/Unprotected Network

PAT (Port Address Translation)

192.168.0.10

192.168.0.11

1025

4406

Client IP Internal Port External Port

2205

2206

192.120.8.5:2205

192.120.8.5:2206

3.2.2 Circuit Gateway

Also called a "Circuit Level Gateway," this is a firewall approach, which validates connections

before allowing data to be exchanged. What this means is that the firewall doesn't simply allow or

disallow packets but also determines whether the connection between both ends is valid according

to configurable rules, then opens a session and permits traffic only from the allowed source and

possibly only for a limited period of time.

Level 5: Application

Level 4: TCP

Level 3: IP

Level 2: Data Link

Level 1: Physical

destination IP address and/or port

source IP address and/or port

time of day

protocol

user

password

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 151 152

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