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Chapter 7 Routing
eircom F1000 Modem User’s Guide
131
The following table describes the labels in this screen.
7.4
The Policy Forwarding Screen
Traditionally, routing is based on the destination address only and the Device takes the shortest
path to forward a packet. Policy forwarding allows the Device to override the default routing
behavior and alter the packet forwarding based on the policy defined by the network administrator.
Policy-based routing is applied to outgoing packets, prior to the normal routing.
You can use source-based policy forwarding to direct traffic from different users through different
connections or distribute traffic among multiple paths for load sharing.
The
Policy Forwarding
screen let you view and configure routing policies on the Device. Click
Network Setting > Routing > Policy Forwarding
to open the
following
screen.
Figure 70
Network Setting > Routing > Policy Forwarding
The following table describes the labels in this screen.
Table 40
DNS Route Add
LABEL
DESCRIPTION
Domain Name
Enter the domain name of the DNS route entry.
Interface
Select the WAN connection through which the Device forwards DNS requests for this domain
name.
Subnet Mask
Enter the subnet mask of the DNS route entry.
OK
Click this to save your changes.
Cancel
Click this to exit this screen without saving any changes.
Table 41
Network Setting > Routing >Policy Forwarding
LABEL
DESCRIPTION
Add new Policy
Forward Rule
Click this to create a new policy forwarding rule.
#
This is the index number of the entry.
Policy Name
This is the name of the rule.
Source IP
This is the source IP address.
Source Subnet
Mask
his is the source subnet mask address.
Protocol
This is the transport layer protocol.
Source Port
This is the source port number.
Page 132 / 359
Chapter 7 Routing
eircom F1000 Modem User’s Guide
132
7.4.1
Add/Edit Policy Forwarding
Click
Add new Policy Forward Rule
in the
Policy Forwarding
screen or click the
Edit
icon next
to a policy. Use this screen to configure the required information for a policy route.
Figure 71
Policy Forwarding: Add/Edit
The following table describes the labels in this screen.
WAN
This is the WAN interface through which the traffic is routed.
Modify
Click the
Edit
icon to edit this policy.
Click the
Delete
icon to remove a policy from the Device. A window displays asking you to
confirm that you want to delete the policy.
Table 41
Network Setting > Routing >Policy Forwarding (continued)
LABEL
DESCRIPTION
Table 42
Policy Forwarding: Add/Edit
LABEL
DESCRIPTION
Policy Name
Enter a descriptive name of up to 8 printable English keyboard characters, not including
spaces.
Source IP
Enter the source IP address.
Source Subnet
Mask
Enter the source subnet mask address.
Protocol
Select the transport layer protocol (
TCP
or
UDP
).
Source Port
Enter the source port number.
Source MAC
Enter the source MAC address.
WAN
Select a WAN interface through which the traffic is sent. You must have the WAN
interface(s) already configured in the
Broadband
screens.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Page 133 / 359
Chapter 7 Routing
eircom F1000 Modem User’s Guide
133
7.5
RIP
Routing Information Protocol (RIP, RFC 1058 and RFC 1389) allows a device to exchange routing
information with other routers.
7.5.1
The RIP Screen
Click
Network Setting > Routing >
RIP
to open the
RIP
screen.
Figure 72
RIP
The following table describes the labels in this screen.
Table 43
RIP
LABEL
DESCRIPTION
#
This is the index of the interface in which the RIP setting is used.
Interface
This is the name of the interface in which the RIP setting is used.
Version
The RIP version controls the format and the broadcasting method of the RIP packets that the
Device sends (it recognizes both formats when receiving). RIP version
1
is universally supported
but RIP version
2
carries more information. RIP version
1
is probably adequate for most
networks, unless you have an unusual network topology.
Operation
Select
Passive
to have the Device update the routing table based on the RIP packets received
from neighbors but not advertise its route information to other routers in this interface.
Select
Active
to have the Device advertise its route information and also listen for routing
updates from neighboring routers.
Enabled
Select the check box to activate the settings.
Apply
Click
Apply
to save your changes back to the Device.
Page 134 / 359
Chapter 7 Routing
eircom F1000 Modem User’s Guide
134
Page 135 / 359
eircom F1000 Modem User’s Guide
135
C
HAPTER
8
Quality of Service (QoS)
8.1
Overview
Quality of Service (QoS) refers to both a network’s ability to deliver data with minimum delay, and
the networking methods used to control the use of bandwidth. Without QoS, all traffic data is
equally likely to be dropped when the network is congested. This can cause a reduction in network
performance and make the network inadequate for time-critical application such as video-on-
demand.
Configure QoS on the Device to group and prioritize application traffic and fine-tune network
performance. Setting up QoS involves these steps:
1
Configure classifiers to sort traffic into different flows.
2
Assign priority and define actions to be performed for a classified traffic flow.
The Device assigns each packet a priority and then queues the packet accordingly. Packets assigned
a high priority are processed more quickly than those with low priority if there is congestion,
allowing time-sensitive applications to flow more smoothly. Time-sensitive applications include both
those that require a low level of latency (delay) and a low level of jitter (variations in delay) such as
Voice over IP (VoIP) or Internet gaming, and those for which jitter alone is a problem such as
Internet radio or streaming video.
This chapter contains information about configuring QoS and editing classifiers.
8.1.1
What You Can Do in this Chapter
• The
General
screen lets you enable or disable QoS and set the upstream bandwidth (
Section 8.3
on page 137
).
• The
Queue Setup
screen lets you configure QoS queue assignment (
Section 8.4 on page 138
).
• The
Class Setup
screen lets you add, edit or delete QoS classifiers (
Section 8.5 on page 140
).
• The
Policer Setup
screen lets you add, edit or delete QoS policers (
Section 8.5 on page 140
).
8.2
What You Need to Know
The following terms and concepts may help as you read through this chapter.
QoS versus Cos
QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given
the same priority. CoS (class of service) is a way of managing traffic in a network by grouping

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