From: Geert Nijs (geert.nijs@simac.be)
Date: Tue Dec 07 2004 - 13:14:46 GMT-3
Microsoft load balancing is a mess basically (IMHO). It has been a while, but if i remember correctly, it messes up some switches, answering
flows with the same source mac address, so that the switch sees the same mac address on multiple ports in the same VLAN, turning it nuts.......
To make it work, you mostly have to adjust your switch config....most vendors have released specific instructions on how to do this on their models......
Regards,
Geert
________________________________
From: nobody@groupstudy.com on behalf of Keane, James
Sent: Tue 12/7/2004 14:02
To: ccielab@groupstudy.com
Subject: ARP - Mac Addresses with I/G Bit set - Load Balancing Question
I have an implementation of Microsoft Network load Balancing (using enterprise servers)
I have ServerA at 192.168.10.8
I have Serverb at 192.168.10.9
I have the VirtualIP at 192.168.10.10
I have SERVERanotherIP at 10.0.99.4
now serverA can ping serverB and VirtualIP
serverB can ping serverA and virtualIP
SERVERanotherIP can ping ServerA and ServerB but not VirtualIP
I have checked the MAC addresses and the virtual one doesnt appear anywhere on the switches ...
My server guy sayes its a multicast mac addresses and the 6506 was dropping the arp as it was resolving it against a unicast ip.
Could it be that for once this Microsoft guy is right ?? (horror)
He has suggested adding static arp entries ... I have secretly done this and it works (shock horror)
Althought its rather messy and an arp entry must exist for all the HSRP default gateways for that subnet.
Please there must be another way ... (or should I eat humble pie)
Anybody come across this before ??
James Keane
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