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add mac address to arp table

ewieczorek
Beginner
Beginner

How do I add a MAC address to the arp table on a 7206 router?

Thank you.

2 Replies 2

moorj
Beginner
Beginner

You can use the global arp command to add a permanent ARP cache entry. For an ethernet example:

ARP 192.168.10.1 0000.0c79.c104 ARPA

reference

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipras_r/1rfipadr.htm#xtocid1

wkumari
Beginner
Beginner

arp 1.2.3.4 44.44.44 arpa F0/0

will add an arp entry for 1.2.3.4.

If you are trying this because you are ARPing for things and not getting a response (you have something like

Protocol Address Age (min) Hardware Addr Type Interface

Internet 1.2.3.4 - Incomplete ARPA FastEthernet2/0.35) then statically entering ARPs isn't liekly to help you very much. ARP is a very reliable protocol, and if it isn't working then it is most likely symptomatic of a larger problem. Also, keeping all of your ARP's correct manually is a hellish job. If you are doing this as a security improvment (or because you have some brain-dead equipment that doesn't support ARP) then good luck ... If you are doing this for security, keep in mind that it is possible to spoof MAC addresses....

-- Warren.

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