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IP Addressing
13
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
1 Networking Overview
IP Addressing
This section describes IP addressing, subnetting, and routing.
Physical Addressing
The Address Resolution Protocol (ARP) software on the C-LAN circuit pack relates
the 32-bit logical IP address, which is configured in software, with the 48-bit physical
address of the C-LAN circuit pack, which is burned into the board at the factory. The
C-LAN board has an ARP table that associates the IP addresses with the hardware
addresses, which are used to route messages across the network. Each C-LAN board
has one physical address and up to 17 assigned IP addresses (one for each port).
Logical Addressing
An IP address is a software-defined 32-bit binary number that identifies a network
node. The IP address has two main parts -- the first n bits specify a “network ID” and
the remaining 32 – n bits specify a “host ID.”
Format
Dotted Decimal
notation
The 32-bit binary IP address is what the computer understands. For human use, the
address is typically expressed in dotted decimal notation — the 32 bits are grouped
into four 8-bit octets (bytes) and converted to decimal numbers separated by decimal
points, as in the example below.
The eight binary bits in each octet can be combined to represent decimal numbers
ranging from 0 to 255.
Class
Type
Network ID Host ID
n
32 – n
Octet 1
11000010
Octet 2
00001101
Octet 3
11011011
Octet 4
00000111
194 . 13 . 219 . 7