Routing Over Ppp Bridging; Network Address Translation Mode - ADTRAN Express L128T S User Manual

Chapter 1. Understanding ISDN and the Express L128T S/T

Routing over PPP Bridging

The Express L128T S/T can support legacy equipment which does not
support PPP IP (IPCP) or IPX (IPXCP) protocols by allowing routing
packets over the WAN connection using PPP Bridging (BCP). To per-
form this, the Express L128T S/T uses a "virtual" Ethernet port. This
port is set up under the Configuration/Bridge menu.
This feature identifies the calling party number for incoming
calls. This feature may not be functional for all countries or if
calling party information is not supplied by the central office
switch.

Network Address Translation Mode

NAT is a special mode of operation in which the Express L128T S/T
obtains a dynamically assigned IP address from the peer router (typi-
cally an Internet Service Provider). This allows a network of comput-
ers to benefit from Ethernet to ISDN speeds while still appearing to
the Internet Service Provider (or central site router) as a single IP ad-
dress, which is typical of PC based serial dial-up solutions.
A call is initiated to the ISP using the Dial menu or demand for a Con-
nection List profile that has the IP parameter NAT set to Yes. The net-
work computer's IP stack may use DHCP to request an IP address,
default gateway address, and domain name server addresses from the
Express L128T S/T.
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