Solved

Windows Server 2008r2 - NLB

Posted on 2013-01-31
6
252 Views
Last Modified: 2014-07-02
Hi...

I am setting up NLB between a physical server and a newly created VM - both are running Windows Server 2008r2.  

The physical servers have been in production for quite some time and are set up with NIC teaming; 4 teamed for the public traffic and 4 teamed for the iSCSI traffic.

The VM is setup with 2 NICs - 1 for public traffic and the other for the NLB heartbeat.

For the physical server: For many reasons, I do not want break these teams to free one up so it can be used/dedicated to the NLB heartbeat.   As a result, I was going to use the public teamed NICs for both types of traffic (public and heartbeat).  

Virtual Server:  These are setup with 2 seperate NICs.  I was going to use one for public traffic and one for the heartbeat.  

Does anyone see an issue with this?

Thank you.
0
Comment
Question by:AMSOL
  • 2
6 Comments
 
LVL 29

Expert Comment

by:Rich Weissler
ID: 38847362
My vm experience has been with VMWare, so if you are using a different hypervisor, this might not apply.
The only 'gotcha' I've experienced with virtual servers in NLB, has been address suppression when using Unicast on the virtual nodes.  If you don't disallow multicasting, I'd definitely be included to use multicasting rather than unicasting.  If you have to unicast, you'll need a static arp address assignment for the NLB's MAC address.
0
 
LVL 36

Expert Comment

by:Jian An Lim
ID: 38849959
you use VLAN then it should not be a problem

again looks like you are doing a clustering/microsoft exchange type.

It is Okay if you are doing those technologies.
0
 

Author Comment

by:AMSOL
ID: 38901985
Hello,

Thank you for the reply.  Yes, we are using VMware.

So if I uderstand your reply, allowing all traffic (heartbeat and public) to flow on 1 NIC would not be an issue.  Is that correct?
0
 
LVL 29

Accepted Solution

by:
Rich Weissler earned 500 total points
ID: 38902054
I assume you are referring to the virtual NICs on the server.  (Not directing traffic through an alternate interface on the host NICs.... usually done because of large data loads.  Heartbeat traffic is very, very tiny.)

With NLB, the heartbeats will flow over the same network as the public data, even if an alternate path is provided.  The only thing a second NIC would provide would be OTHER communication between nodes.  

To reiterate, however, if you use unicast packets, you'd definitely want to configure a static arp address for the cluster MAC address... and the nodes won't be able to otherwise communicate with each other.  (They'll be sharing a MAC address.)  In this case, you MIGHT want to provide the VMs with a second nic to a backend network for communication... if communication between vms is a requirement.
The better plan would be to use multicast packets.  (We ended up moving our 'default implementation' of load balance clusters to multicasting when we moved to VMWare specifically to avoid the five minute address suppression and static arp mapping.)
0

Featured Post

Complete Microsoft Windows PC® & Mac Backup

Backup and recovery solutions to protect all your PCs & Mac– on-premises or in remote locations. Acronis backs up entire PC or Mac with patented reliable disk imaging technology and you will be able to restore workstations to a new, dissimilar hardware in minutes.

Join & Write a Comment

This is a fairly complicated script that will install the required prerequisites to install SCCM 2012 R2 on a server.  It was designed under the functional model in order to compartmentalize each step required, reducing the overall complexity.  The …
A common practice in small networks is making file sharing easy which works extremely well when intra-network security is not an issue. In essence, everyone, that is "Everyone", is given access to all of the shared files - often the entire C: drive …
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now