Billion 5100 Guía Del Usuario

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6.5 Configuring WAN Setup 
To change your BIPAC-5100/5100W’s WAN remote node settings, click WAN. The screen 
differs by the encapsulation. 
 
6.5.1 PPP Half Bridge 
When the PPP Half Bridge is enabled the BIPAC-5100/5100W becomes invisible. The DHCP 
server will duplicate the WAN IP address from the ISP to the local client PC. Only one PC is 
able to access the Internet using half bridge mode. 
Half bridge mode can only be used when a single IP address has been assigned by the ISP, it 
is not suitable for services that provide multiple IP addresses. Half bridge mode is used when 
the use of NAT or NAPT is not desired and there is a single computer attached to the 
BIPAC-5100/5100W ADSL Gateway. 
6.5.2 When to use Half Bridge mode 
When using a separate firewall that will be protecting the network, half bridge mode will allow 
the firewall to appear on the internet using the publicly accessible IP address assigned by the 
ISP. This configuration will allow the dedicated firewall to have full control of the inbound and 
outbound traffic and is the intended purpose for this mode. 
Some applications that embed the IP address of the computer in the data are not compatible 
with NAT or NAPT and so the computer requires a real public IP address. However the number 
of applications that are not compatible with NAT/NAPT are reducing as developers address the