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Data Sheet Nautica 4000 3

ISDN Primary Rate Interface (PRI)

The Nautica 4000’s support of ISDN PRI

enables it to connect directly to an

ISDN switched service network. Bay

Networks ISDN PRI complies with all

major international PRI signaling specifi-

cations. The European standard pro-

vides 30 B-channels plus one D-channel.

The North American standard provides

23 B-channels plus one D-channel.

Software Features

Nautica Routing Services

(NauticaRS)

NauticaRS software enables the Nautica

4000 to maximize connectivity by

supporting standards-based protocol

features and services (see Table 1).

NauticaRS Protocol

Implementations

NauticaRS software provides a

comprehensive set of standards-based

IP,IPX,Frame Relay,and PPP features

and services.

IP NauticaRS ensures highly-reliable,

standards-based connectivity and inter-

operability through standard IP func-

tions and support for major Internet

Engineering Task Force (IETF) Request

for Comments (RFCs) for protocols

including IP,TCP,Routing Information

Protocol (RIP),Address Resolution Pro-

tocol (ARP),Internet Control Message

Protocol (ICMP),User Datagram Proto-

col (UDP),Dynamic Host Configuration

Protocol (DHCP),Bootstrap Protocol

(BootP) Relay,Dynamic RIP routing,

and static routes. This range of support

ensures users highly reliable,standards-

based connectivity and interoperability.

The DHCP and BootP Relay Mode in

NauticaRS allow corporations and

service providers increased choice and

flexibility for determining and imple-

menting their IP Address allocation

strategy. DHCP gives a framework for

passing configuration information to

IP hosts connecting to a network,as

defined under RFC1541. BootP Relay

Mode passes IP address requests and

delivers host-specific configuration

parameters from a centrally located

DHCP server to a DHCP client.

The Nautica 4000 can be configured to

function as a local DHCP server for

workstations connected directly to the

local Ethernet segment. A Nautica 4000

functioning as a DHCP server provides

IP addresses dynamically to worksta-

tions as they appear on the LAN. This

eases IP configuration and reduces

costs by eliminating the need for work-

stations to dial up an ISDN session to

get their IP address.

Nautica 4000’s IP implementation

increases network security and reduces

overhead traffic through its IP RIP

Direction Control feature. This feature

controls the flow of broadcast traffic

over the network. Broadcast traffic

generated by IP RIP can be configured

as send only,receive only,both,or

neither on a per-path basis.

IPX The NauticaRS’s IPX implementa-

tion supports Link Service Access Point

/Logical Link Control 2 (LSAP/LLC2),

IPX over Ethernet Type II,and Novell

proprietary protocol. RIP routing is

also supported to ensure that the best

path to a destination is used.

The Nautica 4000’s IPX implementation

provides increased network security

and reduced overhead traffic through

the IPX Default Route feature,Service

Access Point (SAP) Direction Control,

and Sequenced Packet Exchange (SPX)

spoofing.

Network Address Translation (NAT)

NAT is a method for translating an

internal IP address or network into a

globally unique IP address. NauticaRS’s

support of NAT simplifies management,

configuration tasks,and saves addresses

by enabling service providers to assign

a Nautica 4000 an IP address without

requiring any reconfiguration of the

network behind the router. NAT can

be used on a Nautica 4000 in the

following three ways:

•

NAT with a Single PC. This is a sin-

gle PC connected to a Nautica 4000

that is connected to an Internet

provider. The Nautica 4000 is pro-

vided with the IP address by the

remote router. The Nautica 4000

translates between the PC’s IP

address and the supplied IP address.

• NAT Many to One. All devices on

the internal network are configured

with internal addresses. The

Nautica 4000 translates between

these addresses and a single

external address.

• NAT with Multiple Remote Routers.

Each remote router provides the

Nautica 4000 with a different IP

address. The router translates

between the different addresses

depending on the path used.

Additionally,IP filtering can be used

in conjunction with NAT to prevent

internal users from gaining access

to specified external resources,

enhancing security.

Single IP (SIP) Addressing Support

for this feature provides cost-effective

Internet access by allowing users on a

small LAN to only purchase a single

IP address from their Internet Service

Provider (ISP). SIP addressing support

also simplifies the administration of

remote users because one IP address

pertains to all users.

The Nautica series NAT implementa-

tion works in conjunction with SIP

such that all internal IP addresses are

mapped to a single,legal,external IP

address. The Nautica 4000 automati-

cally translates between the internal

and external IP addresses and deter-

mines for which particular host the

incoming data is destined.

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