Installation manual

Chapter 5: Configuring the CopperJet
5.9 Zero Installation PPP Bridge (ZIPB)
Dynamic ZIPB, also known as PPP Half Bridge, allows a home user to share the public IP
address assigned by their ISP with a single PC on the LAN. This avoids problems caused by
certain applications having to work through NAT, and avoids the need to run a PPP
software stack on a customer’s PC. It is not a bridge, but rather an IP router with
specialized address management.
5.9.1 ZIPB in bridged configurations
In some bridged configurations, a PPPoE/PPPoA client must be installed on each LAN side
PC. No public address is assigned to the device; each LAN side PC uses its public IP
address directly. Enabling ZIPB in your bridged configuration means that there is no
requirement to install third party PPPoE clients on the LAN side PCs, because the CopperJet
runs an embedded PPPoE/PPPoA client.
5.9.2 ZIPB in routed configurations
In NAT routed mode, the PPPoE/PPPoA client is installed on the CopperJet. The CopperJet
uses the public IP address assigned by the ISP, and NAT is used to provide a private
subnet on the LAN. As NAT is being used, ALGs are required for many typical applications.
Certain applications encounter problems when running through NAT. By allowing one PC on
the LAN to temporarily share the public IP address that has been assigned by the ISP, this
PC can run applications without having to go through NAT. The other PCs on the LAN may
access the external network by running through NAT.
5.9.3 Enabling/Disabling ZIPB
To enable or disable ZIPB, go to the Configuration menu and select ZIPB. The ZIPB page is
displayed.
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