Forum Discussion

crispychickenwi's avatar
crispychickenwi
Icon for Nimbostratus rankNimbostratus
Jul 23, 2007

Dropping SOME connections if health check fails.

I have multiple machines (machine A,B,C,D) hitting a particular server on a particular port. A standard TCP health monitor is in use.     What I want to happen is, I want to add another healt...
application delivery
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devops
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Philippe_CLOUP's avatar
Philippe_CLOUP
Icon for Employee rankEmployee
Jul 25, 2007
The Nokia is configured to use VMAC VRRP adress. But this adress is only used for routing through the Nokia. The Nokia, when it sends a packet out, is using ALWAYS is interface MAC address. The gratuitous ARP is send for the Virtuall IP adress, for which the VMAC is used.

 

The tcpdump confirms that the BigIP is sending packet THROUGH the nokia, using the nexthop VMAC. It is receiving packets via the interface MAC of the Nokia (Normal comportment in VRRP Active/standby). The VMAC is only seen when you send ARP request to the Virtual IP to route trafic through it.