Gratuitous ARP causing network disconnections

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Nov 23rd, 2009
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Provided L2VLL to metro customer. He is able to access all systems though it. But two linux systems have problem. Problem starts like this.

Location A ------------------------- Location B

(problem systems

are here)

From location A customer will initiate ping to Location B from two problem systems. We will see their MAC in Location A customer port and Location B trunk port. It is perfect, but after some time we will see the same MAC's on Location B customer port and systems loose ping response.

For this we have run wireshark in Location B customer port and observed 'gratuitous arp' causing this. How to resolve this issue. Can we do something on switches to prevent this problem. Customer doesn't have backup ISP link.


Siva K

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xs.gautam Tue, 03/16/2010 - 12:12
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Check Duplicate IP address might be causing this at location B, since its learning MAC add of location A, from B side location. so its updating the ARP caching so ping response is lost.


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