In this Cisco CCNA training tutorial, you’ll learn around ARP, what the Address Resolution Protocol is, exactly how it works, and what are the regulates to be supplied. Scroll dvery own for the video and also likewise text tutorial.

You are watching: The destination ip address is not 10.10.10.1. why?


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Do you expect to check out an entry for R3 in the ARP cache of R1? Why or why not?

ARP researches use broadactors traffic so they are not forwarded by a router. R1 will have actually entries in its ARP cache for all hosts it has actually seen on its straight associated networks (10.10.10.0/24).

R1 is not directly connected to the 10.10.20.0/24 netoccupational so it will certainly not have actually an enattempt in the ARP cache for R3 at 10.10.20.1.

R1 can reach R3 via R2’s IP attend to 10.10.10.2 – this IP address is consisted of in the ARP cache.

The DNS server at 10.10.10.10 is also in the exact same IP subnet as R1 so will also show up in the ARP cache.

2. Verify the ARP cache on R1, R2, and also R3.

R1#display arp

Protocol Address Era (min) Hardware Addr Type Interface

Internet 10.10.10.1 - 0090.0CD7.0D01 ARPA FastEthernet0/0

Internet 10.10.10.2 4 0004.9A96.A9A5 ARPA FastEthernet0/0

Web 10.10.10.10 2 0090.21C6.D284 ARPA FastEthernet0/0

R2#present arp

Protocol Address Age (min) Hardware Addr Type Interface

Net 10.10.10.1 4 0090.0CD7.0D01 ARPA FastEthernet0/0

Internet 10.10.10.2 - 0004.9A96.A9A5 ARPA FastEthernet0/0

Net 10.10.10.10 1 0090.21C6.D284 ARPA FastEthernet0/0

Net 10.10.20.1 4 0030.F2BA.30E7 ARPA FastEthernet1/0

Net 10.10.20.2 - 0060.2FCA.ACA0 ARPA FastEthernet1/0

R3#show arp

Protocol Address Era (min) Hardware Addr Type Interface

Web 10.10.20.1 - 0030.F2BA.30E7 ARPA FastEthernet0/0

Internet 10.10.20.2 4 0060.2FCA.ACA0 ARPA FastEthernet0/0

R2 is directly associated to 10.10.10.0/24 and 10.10.20.0/24 so it has actually entries in its ARP cache for both netfunctions.

R3 is straight linked to the 10.10.20.0/24 netoccupational so it has entries in its ARP cache for that netoccupational just. It does not have actually any kind of entries for the 10.10.10.0/24 network-related.

More Resources

ARP Commands: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-0/addr_serv/command/reference/ir40asrbook_chapter2.html

Configuring ARP: https://www.cisco.com/c/en/us/td/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA1_7_/configuration/routing_bridging/guide/rtbrgdgd/arp.html

Monitoring and Maintaining ARP Information: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_arp/configuration/15-s/arp-15-s-book/Monitoring-and-Maintaining-ARP-Indevelopment.html

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