Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 4526
  • Last Modified:

Unicast v Multicast in Windows 2008 NLB

Hi All

I am setting up a Windows 2008 server NLB, and there is the option of setting up the cluster operation mode in Unicast or Multicast.

This is slightly complicated by the fact that both the cluster nodes are virtual servers (Vmware ESX guests) running on the same ESX host, which itself is an HP Blade server connected to our Cisco switches via Virtual Connect modules!

Can anyone advise which option is best in this case - Unicast, Multicast or IGMP Multicast?

Much appreciated!
0
kam_uk
Asked:
kam_uk
  • 2
1 Solution
 
blissbearCommented:
The question is best answered by another question.  How many machines are going to need the traffic?

If you only have 2 or 3 machines that will need the data then unicast is fine, as it targets the specified IP addresses directly and can easily migrate acrossed routers.

If you have many machines on the subnet that need access to the data, multicast is useful as it is picked up by every machine on the network and does not need to be sent multiple times, thus reducing the bandwidth overhead on your network.
0
 
kumarnirmalCommented:
I agree with blissbear, the cluster operation mode depends on the type of Application which the Cluster hosts.
0
 
kam_ukAuthor Commented:
This is for an IIS SMTP cluster, which will be used by about 100 machines?

What does unicast/multicast actually mean in layman's terms?
0
 
blissbearCommented:
unicast is traffic that is sent to one IP address.  multicast is a special method of sending data on a LAN that allows you to send it to ALL of the addresses in a subnet.

So, for instance wanted to say, send a video stream to every machine on a LAN, you could do it using multicast technology and every machine would get the data and it would only have to be sent once, thus minimizing the bandwidth usage on the network.
0

Featured Post

Who's Defending Your Organization from Threats?

Protecting against advanced threats requires an IT dream team – a well-oiled machine of people and solutions working together to defend your organization. Download our resource kit today to learn more about the tools you need to build you IT Dream Team!

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now