Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Traffic in Microsoft Network Load Balance

Posted on 2010-11-29
8
616 Views
Last Modified: 2012-05-10
Hello.

I just implemented a NLB for Terminal Services in 3 Windows 2003 Standard Servers. Connection distribution looks working fine, but if I have one active connection and I take a look at the network card's traffic in any other computer in the network, I can see the traffic from the client to the NLB cluster. So, looks like my network switch is doing a broadcast for traffic destinated do the cluster's IP address.

The NLB is configured with only one network card in each server and running in multicast mode.

Why is this happening and how can I resolve this?

Regards.
0
Comment
Question by:Abilis
  • 4
  • 4
8 Comments
 
LVL 57

Expert Comment

by:giltjr
ID: 34277588
What type of switches do you have?  Does it support IGMP snooping?

What is the MAC address for the traffic going to the cluster?

You do realize that multicast is a "special" type of broadcast.
0
 
LVL 2

Author Comment

by:Abilis
ID: 34336711
It is a 3Com Baseline 2848-SFP Plus. I'm not sure if it supports IGMP snooping, but for what I saw on the web, it does.
The MAC address I see in the dumps is the same as the one configured in the cluster.
The one in the cluster properties is 03:bf:c0:a8:00:18. In the dump is the same. Take a look the attached image.

Yeah, I know it works different from a normal unicast packet, but I'm not very familiar with multicast. I wonder if this is a normal condition.

Thanks
dump.jpg
0
 
LVL 57

Accepted Solution

by:
giltjr earned 250 total points
ID: 34336959
0
Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

 
LVL 2

Author Comment

by:Abilis
ID: 34346645
So, if I understand right, with the IGMP snooping my problems would be solved.
If my switch doesn't have it and if it doesn't allow to add static arp entries, I'm lost.

Is that correct?
0
 
LVL 57

Expert Comment

by:giltjr
ID: 34346721
0
 
LVL 2

Author Comment

by:Abilis
ID: 34346767
My switch is the 2848, not the 2948.
http://www.3com.com/products/en_US/detail.jsp?tab=features&sku=3C16486&pathtype=purchase

So I guess I'll have to change to another switch?
0
 
LVL 57

Assisted Solution

by:giltjr
giltjr earned 250 total points
ID: 34346840
Well that is one option.

Do you happen to have a router or another L3 switch in the network?

If so, you could create a VLAN for the Windows server and isolate it at the VLAN level.

The only issue with doing this is that you need to have router to route between the two IP subnets.
0
 
LVL 2

Author Comment

by:Abilis
ID: 34374632
I don't have layer 3 switch yet. I'm going to monitor de traffic and see if it is a problem for now.
Maybe I'll use our internal router and use the VLAN schema. Probably it is better then having this "broadcast" all the time for every terminal connection.

Thanks for your help.
0

Featured Post

Back Up Your Microsoft Windows Server®

Back up all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
How to install and configure Citrix XenApp 6.5 - Part 1. In this video tutorial we have explained step by step installation of Citrix XenApp 6.5 Server on Windows Server 2008 R2 is explained in this video. We have explained the difference between…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

837 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