PPP Service

PPP is the internet standard for the transmission of IP packets over serial lines. Enabling the serial port for PPP allows the NetRS web configuration interface to be run over the serial port.

After selecting PPP, the Local IP address and Remote IP address must be specified. The Local IP address is the address used by the NetRS itself. The Remote IP address is the address assigned to the PC or workstation. Each PPP session requires a unique pair of IP addresses. In the standard setup the NetRS receiver acts as the server and is responsible for assigning the IP addresses to the PC or workstation.

If PPP is used with multiple NetRS receivers, care must be taken in the assignment of the local and remote IP addresses. If the receiver is configured such that each local and remote address pair is unique, then it is possible to connect to multiple NetRS receivers at the same time. If the same local and remote IP address pair is specified for each NetRS, then care must be taken to ensure that only one NetRS is connected to the PC at one time. This is necessary because the NetRS has no way of knowing if another NetRS has already used a given address pair. This applies to workstations as well as to PCs.

PPP addresses can be set up in a private address space. Like port assignments, the IANA, Internet Assigned Numbers Authority, has reserved three blocks of IP addresses for this purpose. The document Address Allocation for Private Internets discusses this and can be found at the following location:

http://www.isi.edu/in-notes/rfc1918.txt

Two radio buttons are provided to specify how the PPP connection is made:

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