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IP Addressing
Physical and Logical Addresses
Internet Addresses
Copyright © 2010, Juniper Networks, Inc.
Flexible IP address assignment to support any portion of a physical interface (for
example, a channel or circuit), exactly one physical interface, or multilink PPP interfaces
Packet segmentation and reassembly
Loose source routing to specify the IP route
Strict source routing to specify the IP route for each hop
Record route to track the route taken
Internet timestamp
Broadcast addressing, both limited broadcast and directed broadcast
Support for 32,000 discrete, simultaneous IP interfaces per router to support thousands
of logical connections
Capability of detecting and reporting changes in the up or down state of any IP interface
IP policy support. See JunosE IP Services Configuration Guide, for more information
about policy configuration.
Indirect next hops
IP tunnel routing tables
This section provides an overview of IP addressing in general and includes a discussion
of CIDR, which your router fully supports.
Physical node addresses are used at the network access layer to identify physical devices
in a network. For example, each Ethernet controller comes from the manufacturer with
a physical address, called a MAC address.
IP implements a system of logical host addresses called IP addresses. The IP addresses
are used by the internetwork and higher layers to identify devices and to perform
internetwork routing. The Address Resolution Protocol (ARP) enables IP to identify the
physical (MAC) address that matches a given IP address. You can use ARP only on
Ethernet and bridged IP 1483 interfaces.
IP is used by all protocols in the layers above and below it to deliver data. This means
that all TCP/IP data flows through IP when it is sent and received, regardless of its final
destination.
Internet addressing uses a 32-bit address field. The bits in this address field are numbered
0 to 31. The 32-bit address field consists of two parts: a network number and a host
number whose boundaries are defined based on the class of IP address. Hosts attached
to the same network must share a common prefix designating their network number.
Chapter 1: Configuring IP
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