Introduction to Networking for NonStop NS-Series Servers (H06.03+, J06.03+)

Networking Concepts

Introduction to Networking for HP Integrity NonStop NS-Series Servers—529874-003

2-4

Switches

A switch receives messages from various devices on the network and routes the

messages over the network to their appropriate destinations. The public telephone

network provides the most obvious example of the use of switching, but switches are

widely used in private networks as well.

Gateways

Networks that use different types of hardware and different protocols, such as TCP/IP

and OSI, can communicate with each other through a gateway. Unlike a router, a

gateway can translate the protocol of one network to a different protocol used by

another network. When it is not being used to translate protocols, “gateway” is used

interchangeably with “router.”

Network Interface Name

A network interface is a communication device through which messages can be sent

and received. Interface names on an Integrity NonStop server are the logical interface

names (LIFs) on the G4SA. To determine the names of these interfaces, issue the

SCF INFO LIF $ZZLAN.* command to the ServerNet LAN Systems Access (SLSA)

subsystem and look at the “Name” column in the resulting display. For example:

Firewalls

A firewall is a system or group of systems that enforces an access control policy

between two or more networks. The actual means by which access control is

accomplished varies widely, but in principle, the firewall can be thought of as a pair of

mechanisms: one which exists to block traffic, and the other which exists to permit

traffic. Some firewalls place a greater emphasis on blocking traffic, while others

emphasize permitting traffic. The most important thing to recognize about a firewall is

that it implements an access control policy. Before you install a firewall, you need to

know what kind of access you want to allow or deny. Also note that because the

firewall is a mechanism for enforcing policy, it imposes its policy on everything behind

1-> INFO LIF $ZZLAN.*

SLSA Info LIF

Associated

Name Object MAC Address Type

$ZZLAN.CC10A CC1.0.A 00:00:00:00:00:00 WAN

$ZZLAN.LANY M0IE1.0.A 08:00:8E:00:7A:D9 Ethernet

$ZZLAN.LANX M0IE1.0.A 08:00:8E:00:7B:BA Ethernet

$ZZLAN.L018 E0153.0.A 08:00:8E:00:78:3A Ethernet

$ZZLAN.L019 E0153.0.B 08:00:8E:00:78:2D Ethernet

$ZZLAN.L01A E0153.1.A 08:00:8E:00:78:2C Ethernet

$ZZLAN.L01B E0153.1.B 08:00:8E:00:78:1C Ethernet

$ZZLAN.L112I G1123.0.A 08:00:8E:00:97:B0 Ethernet

$ZZLAN.L01C T0154.0.A 08:00:8E:80:12:CE Token Ring

$ZZLAN.L01A E0152.0.A 08:00:8E:AB:CD:EF Ethernet