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[ScreenOS] How many Gratuitous ARP (G-ARP) are sent after failover in NSRP?

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Article ID: KB10894 KB Last Updated: 27 Dec 2020Version: 4.0
Summary:

In addition to the number of Gratuitous ARP (G-ARP), as configured by the CLI command set nsrp arp <n>, there are extra ARP packets sent by the new primary NSRP device. This article explains what the extra ARP packets are for.

 

Symptoms:

With a packet capture tool, or snoop, six extra ARP packets are sent by the new NSRP primary device after a failover.

 

Solution:

These extra G-ARP packets are sent by design for IP duplication check purposes.

As a result, the total number of G-ARP is n + 6, where n is configured with the CLI command set nsrp arp <n>.

 

Modification History:

2020-12-27: Article checked for accuracy; article valid and relevant

 

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