SnapGear SG565 Router Manual PDF (Setup & Configuration Guide)

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Network Connections

To manually configure your Internet network settings, enter the

IP Address

Netmask

Internet Gateway

and

DNS Server(s)

supplied by your ISP.

If you have been given a

range of IP addresses, they may be added as

Interface Aliases

; see the

Advanced

section later in this chapter.

Reboot

your CyberGuard SG appliance to establish your Internet connection.

Bridged Internet

Refer to the section entitled

Bridging

later in this chapter.

Secondary Internet Connection

Note

CyberGuard SG gateway and rack mount appliances only.

A secondary Internet connection may be configured for use as a back up connection,

being established only should the primary link lose connectivity (

Internet Failover

Note

CyberGuard SG appliance models SG300, SG530 and SG550 are limited to an analog

modem to ISDN failover connection through the

COM

Modem

port.

Additionally, CyberGuard SG appliances with multifunction network ports (SG7xx series,

SG560, SG565 and SG580) or a DMZ port (SG570, SG575) may be configured with

multiple broadband Internet connections.

Multiple broadband connections can be established concurrently (

Internet Load

Balancing

) or in a failover configuration.

Page 62 / 249

Network Connections

Internet Load Balancing

Note

SG560, SG565, SG570, SG575, SG580 and SG7xx series only.

To enable Internet load balancing, configure your secondary Internet connection in the

same manner as you did the first, then check

Enable Load Balancing

under

Load

Balancing

and click

Apply

Primary and secondary Internet connections need not be the same, e.g. you can perform

load balancing between a PPPoE ADSL connection on one network port, and a Cable

Internet connection on the other.

Limitations

Load balancing works by alternating outgoing traffic across Internet connections in a

round robin manner.

It does not bond both connections together to work as one link, e.g.

it will not bond two 512 kbit/s links to function as a single 1 mbit/s link.

When an internal client makes a connection to a server on the Internet, this and

subsequent connections between the the internal client and remote server will be

confined to the one Internet connection to ensure connections are not broken.

If a second internal client makes a connection to the same remote server, it may or may

not go across the same link, depending on which Internet connection is next to be

selected in the round robin process.

VPN connections such as IPSec or PPTP tunnels will be confined to a single Internet

connection, as they are a single connection (that encapsulate other connections).

Load balancing is not performed for incoming traffic.

This scenario can be addressed

using other solutions such as round robin DNS to alternate incoming connections

between the two links.

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Network Connections

Internet Failover

CyberGuard SG appliances are designed with the real Internet in mind, which may mean

downtime due to ISP equipment or telecommunications network failure.

Failures can be

caused by removing the wrong plug from the wall, typing in the wrong ISP password or

many other reasons.

Regardless of the cause of a failure, it can potentially be very

expensive.

When the main Internet connection fails and the backup connection (failover connection)

is started, VPN connections are restarted and dynamic DNS services are advised of the

new IP address.

To utilize the failover capabilities of your CyberGuard SG appliance, you must:

•

Enable your primary Internet connection for failover

•

Set up a secondary backup Internet connection

Enable the primary connection for failover

Set up your primary broadband Internet connection as described in the

Internet

section of

this chapter.

From the

Connections

menu, select

Edit failover parameters

from the

Configuration

pull down box.

The CyberGuard SG appliance determines whether an Internet connection is up by

listening for responses to

ping

(ICMP echo request) packets sent to a host on the

Internet.

Ensure you choose a host on the Internet that can be contacted reliably and

responds to pings.

You can check whether you can ping a host under

Diagnostics

Network Tests

Ping Test

Figure 3-5

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Network Connections

Enter the IP address of this host in

IP Address to ping

Ping Interval

is the number of seconds to wait between sending pings.

Number of times to attempt this connection

is the number of failed attempts before

this connection is considered failed.

Time to wait between re-trying connections

is the number of seconds to wait between

connection attempts.

Set up a secondary backup Internet connection

To switch to a dialout Internet connection when you primary broadband Internet

connection is unavailable, from the

Connections

menu select the appropriate

Failover

Internet

configuration for the

COM

Modem

port if setting up a narrowband dialout

failover Internet connection, or the appropriate network port if setting up a broadband

failover Internet connection.

Note

The

Failover Cable/DSL/Direct/Dialout Internet

option will not appear as an available

Configuration

until a primary Internet connection has been configured.

Refer to

Enable

the primary connection for failover

above for details on enabling your primary

broadband Internet connection for failover.

Page 65 / 249

Network Connections

Figure 3-6

Next, configure the failover connection as you would a normal Internet connection.

See the

Dialout Internet

in the

COM/Modem

section later in this chapter for a description

of the fields on the

Failover Modem Configuration

page.

See the

Primary Internet Connection

section in this chapter for a description of how to

configure a broadband Internet connection.

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