3Com 3CRWER300-73 Router Manual PDF (Setup & Configuration Guide)

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104

C

HAPTER

5: C

ONFIGURING

THE

R

OUTER

Proxy ARP

Proxy ARP is the technique in which one host, usually a Router, answers

ARP requests intended for another machine. By “faking” its identity, the

Router accepts responsibility for routing packets to the “real” or intended

destination. This heightens the security for your network.

Figure 84

Proxy ARP Screen

1

Check the

Enable ProxyARP

box.

2

Enter the corresponding IP address in the

IP Address From

and

IP Address

To

fields.

3

Click

Apply

.

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Advanced

105

QoS Settings

The QoS (Quality of Service) function allows you to differentiate your

network traffic and provide it with high-priority forwarding service.

The bandwidth gap between LAN and WAN may significantly degrade

performance of critical network applications, such as VoIP, gaming, and

VPN. This QoS function allows you to classify traffic of applications and

provides them with differentiated services (Diffserv).

Figure 85

QoS Settings Screen

1

Check the

Enable QoS

box, and enter the value for

WAN Out Bandwidth

.

2

Define the minimum percentage of bandwidth for each type of traffic.

3

Check the corresponding box to allow more bandwidth allocation.

4

Click

Apply

.

Note that once QoS is enabled, a new tab, Traffic mapping, will become

visible, see

Figure 86

.

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106

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ONFIGURING

THE

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Traffic mapping

Up to 16 rules can be defined to classify your network traffic into Diffserv

forwarding groups and outgoing connections.

Figure 86

Traffic Mapping Screen

Click

Add

, the Edit Traffic Class screen will appear.

Figure 87

Edit Traffic Class Screen

1

Define the Rule name.

2

Select the traffic type from drop-down menu.

3

Select the forwarding group from the

Map to Forwarding Group

drop-down menu.

4

Select the value from the

Remark DSCP as

drop-down menu.

5

Click the

ADVANCED CONFIG

button, a more detailed Edit Traffic class

screen will appear, see

Figure 88

.

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Advanced

107

Figure 88

Detailed Edit Traffic Class Screen

Enter the information, then click

Apply

to make the settings to take

effect.

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108

C

HAPTER

5: C

ONFIGURING

THE

R

OUTER

VPN

The Router has a Virtual Private Network (VPN) feature that provides a

secure link between remote users and the corporate network by

establishing an authenticated and encrypted tunnel for passing secure

data over the Internet. The Router supports three modes of VPN

operation:

■

IPSec (IP Security) — provides IP network-layer encryption. IPSec can

support large encryption networks (such as the Internet) by using

digital certificates for device authentication. When setting up an IPSec

connection between two devices, make sure that they support the

same encryption method.

Note: Enabling IPSec VPN disables pass-through to IPSec and L2TP over

IPSec Virtual Servers on the LAN. Pass-through outbound from clients on

the LAN to servers on the Internet is unaffected.

■

PPTP (Point-to-Point Tunneling Protocol) — provides a secure tunnel

for remote client access to a PPTP security gateway. It is not as secure

as IPSec but is easy to administer. PPTP does not support gateway to

gateway connections and is only suitable for connecting remote users.

Check that your ISP’s routers support this protocol before you use it.

Note: Enabling the PPTP Server disables PPTP pass-through to a Virtual

Server on the LAN. Pass-through outbound from clients on the LAN to

servers on the Internet is unaffected.

■

L2TP over IPSec — this is a combination of two protocols. L2TP is used

to authenticate a user, and IPSec is used to encrypt data. L2TP over

IPSec does not support gateway to gateway connections and is only

suitable for connecting remote users. Check that your ISP’s routers

support this protocol before you use it.

Note: Enabling L2TP over IPSec disables pass-through to IPSec and L2TP

over IPSec Virtual Servers on the LAN. Pass-through outbound from

clients on the LAN to servers on the Internet is unaffected.

Using the VPN Tunnel Configuration screen, you can add new IPSec, L2TP

over IPSec and PPTP connections, and to edit existing connections. When

adding or editing values on this screen remember that both ends of the

connection must contain the same information.

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