ARP Table

Answered Question
Sep 17th, 2009
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I can reduce the size of the ARP table ?. The command show arp sumary, show 300000 address.


Router 2800.-

Correct Answer by Giuseppe Larosa about 7 years 6 months ago

Hello Ricardo,

the right question is whay my router has built a so big table?


check if you have for example a default route towards internet link using interface name instead of an ip address next-hop.


if so your device is using proxy-arp for every internet destination and this is not efficient.

the change in this case is to configure a default static router with an ip address next-hop that of provider router.


Another possibility is that there is an attack by a connected device sending a lot of gratuitous ARPs to your device.


Hope to help

Giuseppe


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Correct Answer
Giuseppe Larosa Thu, 09/17/2009 - 08:05
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Hello Ricardo,

the right question is whay my router has built a so big table?


check if you have for example a default route towards internet link using interface name instead of an ip address next-hop.


if so your device is using proxy-arp for every internet destination and this is not efficient.

the change in this case is to configure a default static router with an ip address next-hop that of provider router.


Another possibility is that there is an attack by a connected device sending a lot of gratuitous ARPs to your device.


Hope to help

Giuseppe


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