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PIX, ARP and Microsoft NLB cluster

Network diagram is here:

http://djinn.narod.ru/Drawing2.jpg

PIX has a route - all packets to user network goes to 10.31.20.103.

If I ping host in user network from server network the ping is successful for about 20 minutes ant that stop. If i do

Clear arp

on PIX - pings are successfuul again for about 20 min and stop again

PIX# sh arp

TRANSIT 10.31.20.102 02bf.0a1f.1467

TRANSIT 10.31.20.101 02bf.0a1f.1467

TRANSIT 10.31.20.103 02bf.0a1f.1467

On Cisco2950 #1

9 0202.0a1f.1467 DYNAMIC Fa0/21

9 0203.0a1f.1467 DYNAMIC Fa0/22

This are cluster physical interfaces MAC addreses

sh mac-a | in 10.31.20.103 02bf.0a1f.1467

no such MAC address

10.31.20.103 is virtual ip of cluster

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