Chapter 10 Interface
PPPoE is often used with cable modems and DSL connections. It provides the following advantages:
•The access and authentication method works with existing systems, including RADIUS.
•You can access one of several network services. This makes it easier for the service provider to offer the service
•PPPoE does not usually require any special configuration of the modem.
PPTP is used to set up virtual private networks (VPN) in unsecure TCP/IP environments. It sets up two sessions.
1The first one runs on TCP port 1723. It is used to start and manage the second one.
2The second one uses Generic Routing Encapsulation (GRE, RFC 2890) to transfer information between the computers.
PPTP is convenient and
In the ZyWALL, you may use PPPoE/PPTP interfaces to connect to your ISP. This way, you do not have to install or manage PPPoE/PPTP software on each computer in the network.
Figure 138 Example: PPPoE/PPTP Interfaces
PPPoE/PPTP interfaces are similar to other interfaces in some ways. They have an IP address, subnet mask, and gateway used to make routing decisions; they restrict bandwidth and packet size; and they can verify the gateway is available. There are two main differences between PPPoE/PPTP interfaces and other interfaces.
1You must set up an ISP account before you create a PPPoE/PPTP interface.
Each ISP account specifies the protocol (PPPoE or PPTP), as well as your ISP account information. If you change ISPs later, you only have to create a new ISP account, not a new PPPoE/PPTP interface. You should not have to change any network policies.
2You do not set up the subnet mask or gateway.
PPPoE/PPTP interfaces are interfaces between the ZyWALL and only one computer. Therefore, the subnet mask is always 255.255.255.255. In addition, the ZyWALL always treats the ISP as a gateway.
At the time of writing, it is possible to set up the IP address of the gateway (ISP) using CLI commands but not in the web configurator.
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