Scenario A-1: One Device Pings Another On The Same Layer 2 Network; Scenario A-1: One Device Pings Another On The Same Layer 2 Network - HP Rx2620-2 - Integrity - 0 MB RAM Manual

These scenarios provide a baseline of typical network addressing and communication using IP.
This baseline will be referred to later in this document to differentiate how HP Integrity Network
Adapter Teaming functions in these same scenarios. By understanding the differences in simple
examples such as these (without HP's Network Adapter Teaming technology involved),
implementers will have a better understanding of how HP's Network Adapter Teaming technology
may work in their environment.
Scenario A- 1 : One Device Pings Another on the Same Layer 2 Network
Figure A-1 Scenario A-1: One device pings another on the same Layer 2 network
MAC = A
IP = 1.1.1.1
1. Red transmits a broadcast ARP request asking for Blue's MAC address.
A user on Red issues the command ping 1.1.1.2 to initiate a ping to Blue. The number 1.1.1.2
refers to Blue's IP address, or protocol address. First, Red determines whether or not Blue
is on the same Layer 2 network by running an algorithm (details of this algorithm are beyond
the scope of this document) using its own IP address of 1.1.1.1, its own subnet mask (not
shown), and Blue's IP address of 1.1.1.2. If Blue is on a different Layer 2 network, then Red
will need to use its gateway, or router, to get to Blue.
Once Red has determined that Blue is on the same Layer 2 network, Red must find out what
Blue's MAC address is. First, Red checks its own ARP cache for a MAC address entry
matching the IP address of 1.1.1.2. ARP is used to map protocol addresses to hardware
addresses. If Red does not have a static entry or an entry cached from a previous conversation
with Blue, then it must broadcast an ARP Request frame containing the IP address of Blue
on the network asking Blue to respond and provide its MAC address. Red must broadcast
this ARP request because without knowing Blue's unique MAC address, it has no way of
sending a frame directly (unicast) to Blue.
2. Blue transmits a unicast ARP reply to Red, providing its MAC address (B).
Blue sees the ARP request containing its own IP address and responds with a unicast ARP
reply directly to Red. Blue also notes Red's MAC address (A) and IP address of 1.1.1.1, and
enters them into its ARP cache. Red receives the ARP reply and enters Blue's MAC address
(B) and IP address (1.1.1.2) into its own ARP cache.
3. Red transmits a unicast ping request to Blue using Blue's MAC address (B).
Red can now create a ping request frame using Blue's MAC address (B). Red sends the ping
request to Blue using Blue's MAC address (B). Blue receives the ping request frame and
notices that a station with an IP address of 1.1.1.1 is requesting that it respond.
4. Blue transmits a broadcast ARP request asking for Red's MAC address.
92 – Overview of Network Addressing and Communication
Ethernet
Red
MAC = B
IP = 1.1.1.2
Blue