Definity ECS Admin for Network Connectivity.pdf - TextFiles.com

IP Addressing
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
n
32 – n
Class
Type
Network ID
Host ID
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.
Octet 1
11000010
Octet 2
00001101
Octet 3
11011011
Octet 4
00000111
194 . 13 . 219 . 7
The eight binary bits in each octet can be combined to represent decimal numbers
ranging from 0 to 255.
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
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