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1. A ping request is sent from computer A to computer H. This triggers an ARP request from A to its default gateway to resolve the MAC address for H's IP address. 2. The ARP request propagates through the network, triggering ARP replies that allow the switch and router ARP tables to be populated with the correct MAC-IP mappings to route the ping request. 3. Once all the ARP tables are populated, the actual ping request packet is finally able to travel the network path from A to H.

EspiritualTecnologia
1 de 22
Simple net pinging Date 03/06/2007 Hanan Ohana
Motivation ,[object Object],[object Object],[object Object]
Net introduction ,[object Object],[object Object],[object Object],[object Object]
Net introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 A ARP B ARP G ARP H ARP R ARP R ARP CAM CAM
IP packet release algorithm ,[object Object],Local Destination IP? ARP Target MAC Known? Send to Gateway Send to destination Send to destination Yes No Yes No Decision needed
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 A ARP B ARP G ARP H ARP R ARP R ARP CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 A ARP B ARP G ARP H ARP R ARP R ARP CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],FCS TRAILER 10.0.0.3 000000 10.0.0.1 A 0001 4 6 0800 1 0806 A FFFF 1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 A ARP B ARP G ARP H ARP R ARP R ARP A-leg1 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 R ARP R ARP A-leg1 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 R ARP R ARP A-leg1 C-leg3 CAM CAM FCS TRAILER 10.0.0.3 C 10.0.0.1 A 0002 4 6 0800 1 0806 C A
PING chain of events ,[object Object],[object Object],[object Object],[object Object],FCS PING 30.0.0.3 10.0.0.1 0800 A C 1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 R ARP R ARP A-leg1 C-leg3 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 R ARP R ARP A-leg1 C-leg3 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],FCS TRAILER 20.0.0.2 000000 20.0.0.1 D 0001 4 6 0800 1 0806 D FFFF 1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 R ARP A-leg1 C-leg3 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 R ARP A-leg1 C-leg3 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 R ARP A-leg1 C-leg3 CAM CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP G ARP H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 R ARP A-leg1 C-leg3 CAM F-leg3 CAM FCS TRAILER 30.0.0.3 000000 30.0.0.1 F 0001 4 6 0800 1 0806 F FFFF
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP F-30.0.0.1 G ARP F-30.0.0.1 H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 R ARP A-leg1 C-leg3 CAM F-leg3 CAM
PING chain of events ,[object Object],[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP F-30.0.0.1 G ARP F-30.0.0.1 H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 H-30.0.0.3 R ARP A-leg1 C-leg3 CAM F-leg3 H-leg2 CAM FCS TRAILER 30.0.0.3 H 30.0.0.1 F 0002 4 6 0800 1 0806 H F
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP F-30.0.0.1 G ARP F-30.0.0.1 H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 H-30.0.0.3 R ARP A-leg1 C-leg3 CAM F-leg3 H-leg2 CAM
PING chain of events ,[object Object],[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 A ARP A-10.0.0.1 B ARP F-30.0.0.1 G ARP F-30.0.0.1 H ARP A-10.0.0.1 E-20.0.0.2 R ARP D-20.0.0.1 H-30.0.0.3 R ARP A-leg1 C-leg3 CAM F-leg3 H-leg2 CAM
The net in steady state ,[object Object],[object Object],1 1 2 3 3 2 A B C D E F G H IP 10.0.0.1 GW 10.0.0.3 IP 10.0.0.2 GW 10.0.0.3 IP 10.0.0.3 IP 20.0.0.1 IP 20.0.0.2 IP 30.0.0.1 IP 30.0.0.2 GW 30.0.0.1 IP 30.0.0.3 GW 30.0.0.1 GW 20.0.0.2 GW 20.0.0.1 C-10.0.0.3 B-10.0.0.2 A ARP A-10.0.0.1 C-10.0.0.3 B ARP F-30.0.0.1 H-30.0.0.3 G ARP F-30.0.0.1 G-30.0.0.2 H ARP A-10.0.0.1 E-20.0.0.2 B-10.0.0.2 R ARP D-20.0.0.1 H-30.0.0.3 G-30.0.0.2 R ARP A-leg1 C-leg3 B-leg2 CAM F-leg3 H-leg2 G-leg1 CAM
Thank You

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