Cisco 776 - 776 Router - EN Manual de usuario descargar pdf (Pagina 6)

of the devices in the small

office network share a single,

public IP address. With NAT,

customers can avoid paying

their ISP for multiple addresses.

In addition, NAT provides

security by disguising the true

IP addresses of each internal

station, making it harder for

hackers to break into the net-

work. The 3Com LAN Modem

supported all of the Internet

applications tested showing its

cost saving and security bene-

fits in a small office LAN.

When supporting applications

that utilize certain protocols,

NAT can pose significant

problems. If the router is

unable to translate packets

from a particular application

or protocol, it simply discards

the data. This can be especially

problematic with newer

applications that use UDP or

uncommon IP protocols such as

PPTP. The 3Com LAN Modem

was the only device tested that

provided support for all the

applications types tested

showing it’s suitable for use in

business and home environ-

ments. The 3Com LAN

Modem was also able to trans-

fer the application traffic from

its “out-of-the-box” state

meaning it required no addi-

tional configuration to support

any of the applications tested.

When multiple stations behind

the NAT router use multi-

media streaming applications,

all incoming connections —

including those destined for

multiple internal stations — are

directed at a single IP address.

The router must map the

inbound traffic to its appro-

priate destination. In this sce-

nario, outbound connections

initiated by stations inside the

router often may succeed;

however, inbound connections

often fail.

The 3Com LAN Modem sup-

ported applications when

multiple sessions ran simul-

taneously between several

workstations. The 3Com LAN

Modem was the only ISDN

router tested that supported

multiple, simultaneous video

conferencing sessions using

applications such as Net-

Meeting and CU-SeeMe. Out

of all the products tested, the

3Com LAN Modem was the

only ISDN router that sup-

ported videoconferencing

initiated from an external net-

work. Furthermore, results

showed that the 3Com LAN

Modem was the only ISDN

router that used the UDP proto-

col by default for RealPlayer

traffic, a more efficient way for

streaming media transmissions

than TCP. All of the other

devices tested transferred Real

Player traffic with TCP or

required extra configuration to

the ISDN router to support UDP.

GUI Evaluation

Typically, SOHO users have

minimal experience in con-

figuring and managing ISDN

routers. They require a GUI

that will enable them to quickly

configure the device from an

“out-of-the-box” state. These

users want to manage and mon-

itor the ISDN router from the

same GUI without having to

access the command line inter-

face, a procedure usually

reserved for more experienced

consumers. It also helps users

to learn just one GUI, instead

of several.

3Com LAN Modem’s GUI — a

Web server embedded in firm-

ware — can be accessed through

any standard Web browser. Other

products force you to install a

special management utility on a

single workstation, which limits

access. The 3Com LAN

Modem’s embedded GUI is also

OS-independent and can be

accessed from Windows,

Macintosh or Unix platforms.

Additionally, the 3Com LAN

Modem GUI supports all product

features and functions while

competitive products only allow

a small subset of features to be

implemented through the GUI.

Results also show that competi-

tive products require switching

between the GUI and command

line interface to successfully

implement applications.

Technical support groups from

competitive vendors explicitly

state that only the command line

interface is fully supported.

Multiple Destination

Network Support

Testing revealed that, unlike

competitive products tested,

3Com’s LAN Modem offers

support for multiple destination

networks, as well as data call

bumping. The significance of

this capability is that the 3Com

LAN Modem can manage

simultaneous connections to

multiple networks — such as

The Tolly Group 3Com Corp. OfficeConnect LAN Modem

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