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Data Sheet Nautica 4000 5

DHCP Support Nautica 4000s can

use a standard mechanism for passing

IP address requests and delivering host-

specific configuration parameters from

a centrally located DHCP Server to a

DHCP Client (workstation) connected

to the remote LAN. This capability is

referred to as BootP Relay mode.

A Nautica 4000 can also be configured

to function as a local DHCP server for

workstations directly connected to the

local Ethernet segment. This allows IP

addresses to be dynamically allocated

without an ISDN call being placed to

the central site.

DHCP and BootP support provides

major corporations and service

providers with increased flexibility

when determining and implementing

their IP address allocation strategies.

Dynamic IP Addressing This feature

allows an ISP or corporate IP address

administrator to dynamically allocate an

external IP address to any Nautica

series platform for the duration of its

connection. This is achieved through

the use of PPP and the Internet Proto-

col Control Protocol (PPP/IPCP),or

DHCP. This automatic address alloca-

tion technique can be enhanced,where

required,by using the DHCP server fea-

ture to allow the Nautica series access

router to dynamically allocate local

(internal) IP addresses to the hosts,

without activating the ISDN link,as is

required when attached to a local LAN.

Frame Relay NauticaRS integrates

incoming Frame Relay traffic from

Frame Relay access devices such as the

Nautica CLAM,with dial-in traffic to

incorporate networks or the Internet

over public or private Frame Relay

networks. Nautica 4000 routers can

support up to 64 Permanent Virtual

Circuits (PVCs) over a Frame Relay net-

work. NauticaRS supports RFC1490

encapsulation,ensuring multivendor

interoperability over Frame Relay for

IP/IPX routing and transparent bridging.

PPP and MP Industry-standard PPP

and RFC 1990 — MP are supported

for multivendor interoperability over

ISDN and leased lines. PPP and MP

are enhanced by the Nautica 4000’s

support of PPTP,BCP,and BACP,which

extend connectivity,ensure adequate

bandwidth,and provide security.

PPTP allows PC users to extend the PPP

connection over a composite path of

LAN and ISDN links. An extension of

PPP,PPTP supports Virtual Private Net-

works (VPNs) and provides branch

offices and remote/mobile users with

low-cost access to corporate network

resources through an Internet connec-

tion. This eliminates long distance

charges as well as management issues

associated with maintaining private net-

works. BCP allows nonrouted protocols

such as AppleTalk to be bridged over a

PPP link to any other router or bridge

supporting the PPP/BCP standard.

BACP manages the bandwidth available

during Multilink calls. With BACP,a

platform receiving the call has the abil-

ity to negotiate bandwidth with the

platform initiating the call. The negotia-

tion can be based on available

resources or through the dynamic mon-

itoring of the actual traffic across the

link. This solves the problem of insuffi-

cient bandwidth,which often occurs

when ISDN links are repeatedly initial-

ized and brought down (thrashing),by

making sure that both ends have

adequate bandwidth for operation.

Data Compression

NauticaRS software enables the Nautica

4000 to increase the amount of data

that can be carried across an ISDN or

leased line. Bay Networks data com-

pression support improves performance

and throughput without compromising

compatibility by using standards-based

techniques. Compression interoperabil-

ity is available in a wide array of remote

environments,from third-party routers

to Microsoft Windows workstations.

Dial Services

NauticaRS dial-up services ensure

remote office connectivity and avail-

ability with features such as Dial-on-

Demand,Bandwidth-on-Demand,and

Dial Backup. The Nautica 4000 can

accept and make calls to standalone

ISDN access routers with PC-integral

or standalone ISDN Terminal Adapters

over PPP or V.120. When equipped

with integrated modems,the Nautica

4000 can accept dial-up calls from

remote users dialing in with analog

modems. The Nautica 4000 will auto-

matically route incoming analog calls

to an available modem.

Dial-On-Demand The Nautica 4000

routers take full advantage of the speed

and bandwidth of ISDN lines while

maintaining control of call costs with

ISDN Dial-on-Demand. A link is auto-

matically brought up when there

is data to transfer and closes down the

link once traffic has stopped for a

specified amount of time. Sites with

intermittent data transfers can realize

maximum cost savings connections

using this feature.

Bandwidth-on-Demand During

peak usage periods,the NauticaRS

Bandwidth-on-Demand feature gives

additional bandwidth. BACP is the

mechanism used to add or delete links.

Once line usage reaches a predefined

level,the Nautica 4000 will open an

additional B-channel and load balance

across channels. When line usage drops

below the predefined level,the Nautica

4000 closes down one B-channel and

returns to the original bandwidth.

Bandwidth-on-Demand can increase the

synchronous port’s bandwidth by using

ISDN channels during peak traffic peri-

ods. It can also add bandwidth to ISDN

B-channels that are already being used.

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