ADTRAN Express 6100, Manual

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Chapter 1. Understanding IDSL and the Express 6100/6120
1-6 Express 6100/6120 User Manual 61200176L1-1
fault gateway (recommended for remote applications when there are
no other routers on the remote LAN).
IPX Routing
Network routes and services are learned and advertised using Nov-
ell’s RIP and SAP.
Concurrent Routing And Bridging
The Express 6100/6120 can route IP and IPX as well as bridge non-IP/
IPX packets simultaneously. The PPP profile will by default negotiate
PPP network protocols to support the transmission and reception of
IP, IPX, and Bridge packets. If the PPP peer does not accept a protocol,
the Express 6100/6120 will fall back to any combination of routing and
bridging.
Network Address Translation Mode
NAT is a special mode of operation in which the Express 6100/6120
obtains a dynamically assigned IP address from the peer router (typi-
cally an Internet Service Provider). This allows a network of comput-
ers to appear as a single IP address.
NAT is enabled if the layer-two protocol is PPP and the PPP profile
has the IP parameter
NAT set to Yes , or the layer two protocol is Frame
Relay and a DLCI mapping has the IP Map/Nat parameter set to Yes .
The network computer’s IP stack may use DHCP to request an IP ad-
dress, default gateway address, and domain name server addresses
from the Express 6100/6120.