Planning Your IP Configuration
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CopperLink CL2300 User Manual
5
• IP Context Overview
Configuring Network Address Port Translation (NAPT)
You can configure NAPT by creating a profile that is afterwards used on an explicit IP interface. In Trinity ter-
minology, an IP interface uses a NAPT profile, as shown in
36.
Configuring Static IP Routing
Trinity allows you to define static routing entries, which are destination-address-to-egress-interface mappings
established by the network administrator prior to the beginning of routing. These mappings do not change
unless the network administrator alerts them. Algorithms that use static routes are simple to design, and work
well in environments in which network traffic is relatively predictable and where network design is relatively
simple.
Routing entries are grouped in routing-tables. A set of route commands in the IP interface can be used to select
the routing-table for inbound traffic for different packet-header fields. The route command in the local mode,
within the IP context configures the routing-table to consult for locally-generated traffic. Trinity tests packets
against the routing-table-selection rules one by one. The first match determines the routing-table to use.
Because Trinity stops testing rules after the first match, the order of the routing-selection rules is critical. If no
conditions match or if there is no route command in the interface, the software uses the DEFAULT routing
table.
Configuring Access Control Lists (ACL)
Packet filtering helps to control packet movement through the network. Such control can help to limit network
traffic and restrict network use by certain users or devices. An access control list is a sequential collection of per-
mit and deny conditions that apply to packets on a certain interface. Access control lists can be configured for
all routed network protocols (IP, ICMP, TCP, UDP, and SCTP) to filter the packets of those protocols as the
packets pass through a device. Trinity tests packets against the conditions in an access list one by one. The first
match determines whether Trinity accepts or rejects the packet. Because Trinity stops testing conditions after
the first match, the order of the conditions is critical. If no conditions match, the software rejects the address.
Configuring Quality of Service (QoS)
A service-policy profile can be attached to an IP interface to manage QoS for network traffic, as shown in
36. QoS refers to the ability of a network to provide improved service to selected network
traffic over various underlying technologies including Ethernet and 802.x type networks, as well as IP-routed
networks. In particular, QoS features provide improved and more predictable network service by providing the
following features:
•
Supporting dedicated bandwidth
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Improving loss characteristics
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Avoiding and managing network congestion
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Shaping network traffic
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Setting traffic priorities across the network