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NLB Causes Duplicate PINGS DUP!

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NLB Causes Duplicate PINGS DUP! - 6.Oct.2005 7:42:00 AM   
TDodds

 

Posts: 17
Joined: 26.Mar.2005
From: Johannesburg
Status: offline
Hi,

Has anyone come across using ISA 2004 in a NLB or even any NLB setup. If you ping from a unix system ICMP reports that it's getting many duplicate replies (Windows ping does not show this).

Is there anyway of "fixing" this so only 1 ip is displayed?

Thanks
Trevor
Post #: 1
RE: NLB Causes Duplicate PINGS DUP! - 11.Oct.2005 6:02:00 AM   
stinkyprimo

 

Posts: 6
Joined: 30.Sep.2005
Status: offline
I have seen this on all my NLB clusters, this is how NLB works. When you ping the cluster address your actually pinging the cluster ip with multicast arp. Because the cluster ip equates to the multicast arp all the NLB cluster members will reply with unicast arp, and that why each NLB member will respond, giving your unix host multiple replies.

Hope that make sense.

(in reply to TDodds)
Post #: 2

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