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GlobeSurfer
®
II 1.8 - 7.2 - 7.2 S
REFERENCE MANUAL
6.6.7
Routing
Access GlobeSurfer
®
II’s routing settings by clicking the ‘Routing’ icon from the ‘Advanced’ screen.
Figure 6.44 Routing
You can add, edit and delete routing rules from the routing table (see Figure 6.44) in the manner described in Section 3.4.
When adding a routing rule, you need to specify (see Figure 6.45):
‘Name’
Select the type of network device (LAN Bridge or WAN Cellular)
‘Destination’
The destination is the destination host, subnet address, network address, or default route. The destination for
a default route is 0.0.0.0.
‘Netmask’
The network mask is used in conjunction with the destination to determine when a route is used.
‘Gateway’
Enter the IP address of the GlobeSurfer
®
II.
‘Metric’
A measurement of the preference of a route. Typically, the lowest metric is the most preferred route. If multiple
routes exist to a given destination network, the route with the lowest metric is used.
Figure 6.45 Route setttings
‘Routing Information Protocol (RIP)’
Select this check-box in order to enable connections previously defined to use RIP. If this check-box is not selected, RIP will be
disabled for all connections, including those defined to use RIP.
‘Internet Group Management Protocol (IGMP)’
GlobeSurfer
®
II provides support for IGMP multicasting, which allows hosts connected to a network to be updated whenever an
important change occurs in the network. A multicast is simply a message that is sent simultaneously to a pre-defined group
of recipients. When you join a multicast group you will receive all messages addressed to the group, much like what happens
when an e-mail message is sent to a mailing list. IGMP multicasting may be useful when connected to the Internet through
a router. When an application running on a LAN computer sends out a request to join a multicast group, GlobeSurfer
®
II will
listen and intercept this group’s messages, sending them to the subscribed application.
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®
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‘Domain Routing’
When GlobeSurfer
®
II’s DNS server receives a reply from an external DNS server, it will add a routing entry for the IP address
of the reply through the device from which it arrived. This means that future packets from this IP address will be routed
through the device from which the reply arrived.
6.6.8
Network objects
Network Objects is a method used to abstractly define a set of LAN hosts, according to one or more MAC address, IP address,
and host name. Defining such a group can assist when configuring system rules. For example, network objects can be used
when configuring GlobeSurfer
®
II’s security filtering settings such as IP address filtering, host name filtering or MAC address
filtering.
You can use network objects in order to apply security rules based on host names instead of IP addresses. This may be useful,
since IP addresses change from time to time. Moreover, it is possible to define network objects according to MAC addresses,
making rule application more persistent against network configuration settings.
To define a network object:
1. Click the ‘Network Objects’ icon in the ‘Advanced’ screen of the Web-based Management. The ‘Network Objects’ screen will
appear (see Figure 6.46).
Figure 6.46 Network objects
2. Click the ‘New Entry’ link, the ‘Edit Network Object’ screen will appear (see Figure 6.47).
Figure 6.47 Edit network object
3.
Name the network object in the Description field, and click ‘New Entry’ to actually create it. The ‘Edit tem’ screen will appear
(see Figure 6.48). The source address can be entered in one of the following methods:
•
IP Address
•
IP Subnet
•
IP Range
•
MAC Address
•
Host Name
When selecting a method from the combo box, the screen will refresh, presenting the respective fields by which to enter the
relevant information.
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®
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REFERENCE MANUAL
Figure 6.48 Edit item
4. Select a method and enter the source address accordingly.
5. Click ‘OK’ to save the settings.
6.6.9
Dynamic DNS
The Dynamic DNS (DDNS) service enables you to alias a dynamic IP address to a static hostname, allowing your computer
to be more easily accessible from various locations on the Internet. Typically, when you connect to the Internet, your service
provider assigns an unused IP address from a pool of IP addresses, and this address is used only for the duration of a specific
connection. Dynamically assigning addresses extends the usable pool of available IP addresses, whilst maintaining a constant
domain name.
When using the DDNS service, each time the IP address provided by your ISP changes, the DNS database will change
accordingly to reflect the change. In this way, even though your IP address will change often, your domain name will remain
constant and accessible.
6.6.9.1
Opening a Dynamic DNS Account
In order to use the DDNS feature, you must first obtain a DDNS account. For example, you can open a free account
at http://www.dyndns.org/account/create.html. When applying for an account, you will need to specify a user name
and password. Please have them readily available when customizing GlobeSurfer
®
II’s DDNS support.
6.6.9.2
Using Dynamic DNS
Use the DDNS feature to define different a static host name for your WAN connection.
1. Access the Dynamic DNS settings by clicking the ‘Dynamic DNS’ icon in the ‘Advanced’ screen. The ‘Dynamic
DNS’ connections screen will appear (see Figure 6.49).
Figure 6.49 Dynamic DNS
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®
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2. Click the ‘Add connection’ link to add a new DDNS entry. The ‘Dynamic DNS’ screen will appear (see Figure 6.50).
Figure 6.50 Dynamic DNS new connection
3. Specify the DDNS parameters:
‘User Name’
Enter your DDNS user name
‘Password’
Enter your DDNS password
‘Host Name’
Enter your full DDNS domain name
‘Click Here to Initiate and Manage your Subscription’
Clicking this link will open the selected provider’s account creation Web page. For example, when dyndns.org is
selected, the following page will open: http://www.dyndns.com/account/
‘Wildcard’
Select this check-box to enable use of special links such as www.<your host>.<DDNS domain>
‘Mail Exchanger’
Enter your mail exchange server address, to redirect all e-mails arriving at your DDNS address to your mail server
‘Backup MX’
Select this check-box to designate the mail exchange server to be a backup server
‘Offline’
If you wish to temporarily take your site of ine (prevent trafc from reaching your DDNS domain name), check this
box to enable redirection of DNS requests to an alternative URL, predefined in your DDNS account. The availability
of this feature depends on your account’s level and type of service.
4. Click ‘OK’ to save the settings.
6.6.10 IP address distribution
GlobeSurfer
®
II’s Dynamic Host Configuration Protocol (DHCP) server makes it possible to easily add computers that are
configured as DHCP clients to the home network. It provides a mechanism for allocating IP addresses and delivering network
configuration parameters to such hosts. GlobeSurfer
®
II’s default DHCP server resides on the LAN bridge.
A client (host) sends out a broadcast message on the LAN requesting an IP address for itself. The DHCP server then checks its
list of available addresses and leases a local IP address to the host for a specific period of time and simultaneously designates
this IP address as `taken’. At this point the host is configured with an IP address for the duration of the lease. The host can
choose to renew an expiring lease or let it expire. If it chooses to renew a lease then it will also receive current information
about network services, as it did with the original lease, allowing it to update its network configurations to reflect any changes
that may have occurred since it first connected to the network. If the host wishes to terminate a lease before its expiration it
can send a release message to the DHCP server, which will then make the IP address available for use by others.
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®
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GlobeSurfer
®
II’s DHCP server:
•
Displays a list of all DHCP host devices connected to GlobeSurfer
®
II
•
Defines the range of IP addresses that can be allocated in the LAN
•
Defines the length of time for which dynamic IP addresses are allocated
•
Provides the above configurations for each LAN device and can be configured and enabled/disabled separately for each
LAN device
•
Can assign a static lease to a LAN PC so that it receives the same IP address each time it connects to the network, even
if this IP address is within the range of addresses that the DHCP server may assign to other computers
•
Provides the DNS server with the host name and IP address of each PC that is connected to the LAN
Additionally, GlobeSurfer
®
II can act as a DHCP relay, escalating DHCP responsibilities to a WAN DHCP server. In this case,
GlobeSurfer
®
II will act merely as a router, while its LAN hosts will receive their IP addresses from a DHCP server on the WAN.
6.6.10.1 DHCP Server Settings
To view a summary of the services currently being provided by the DHCP server click the ‘IP Address Distribution’
icon in the ‘Advanced’ screen. The ‘IP Address Distribution’ screen will appear (see Figure 6.51).
Figure 6.51 IP address distribution
To edit the DHCP server settings for a device:
1. Click the device’s Edit action icon. The DHCP settings for this device will appear (see Figure 6.52).
Figure 6.52 DHCP settings
2.
Select the DHCP service:
‘Disabled’
Disable the DHCP server for this device.
‘DHCP Server’
Enable the DHCP server for this device.
‘DHCP Relay’
Set this device to act as a DHCP relay (see section 6.6.10.2).

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