Solved

Windows 2003 NLB, not accessible from other subnet.

Posted on 2009-05-19
3
796 Views
Last Modified: 2012-05-07
Hi All,
Ive setup 2 web servers (each with 2 NICs) into one Windows NLB cluster.
Im able to access this cluster very well from same subnet front-end IP are, but not from other subnet.
Details-
ServerA-
Front-end-
IP 192.168.40.217
Subnet mask: 255.255.255.0
Gateway: 192.168.40.1

Backend
IP 192.168.13.49
Subnetmask 255.255.255.0
Gateway: Null

ServerB-
Front-end-
IP 192.168.40.218
Subnet mask: 255.255.255.0
Gateway: 192.168.40.1

Backend
IP 192.168.13.50
Subnet mask 255.255.255.0
Gateway: Null

NLB IP  192.168.40.219
Subnet mask 255.255.255.0

I need to load balance only Front-end NIC and back-end is only for SQL access.

Im able to access this NLB IP within 192.168.40.x subnet without any issues, and also able to see the NLB Manager showing all servers Converged. All settings default.
Cluster Operation Mode  Multicast
Defined Port rules: 0-65535
      Both,
      Multiple Host
      Affinity : Single


Please help me in this, not sure what am I missing.
0
Comment
Question by:sandeepkulkarnib
3 Comments
 
LVL 17

Expert Comment

by:Andres Perales
ID: 24423896
Do you have a router any where in your network to do this type of routing?
0
 
LVL 83

Accepted Solution

by:
oBdA earned 500 total points
ID: 24423903
Since you have two NICs in the nodes anyway, simply change the cluster mode to Unicast instead of Multicast. Most routers don't publish multicast addresses, so you'd have to manually create ARP entries for your NLB address.
Since you have two NICs, you'll still have inter-host communication even with the cluster in multicast.
Some links that might be of interest:

Unicast NLB nodes cannot communicate over an NLB-enabled network adaptor in Windows Server 2003
http://support.microsoft.com/kb/898867

Network Load Balancing: Configuration Best Practices for Windows 2000 and Windows Server 2003
http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/clustering/nlbbp.mspx

Network Load Balancing Frequently Asked Questions
http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/clustering/nlbfaq.mspx

How Network Load Balancing works
http://technet2.microsoft.com/windowsserver/en/library/3b98db33-e748-4a75-a0af-e445569655be1033.mspx?mfr=true

Network Load Balancing clusters
http://technet2.microsoft.com/windowsserver/en/library/98d46a24-96d8-412c-87d8-28ace62323d21033.mspx?mfr=true

Network Load Balancing Best practices
http://technet2.microsoft.com/windowsserver/en/library/fa6ef832-1aa7-472f-b492-0dd3c60bd46d1033.mspx?mfr=true

Using NLB with ISA Server - Part 2: Layer 2 Fun with Unicast and Multicast Modes
http://www.isaserver.org/articles/basicnlbpart2.html

Catalyst Switches for Microsoft Network Load Balancing Configuration Example
http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a0080a07203.shtml
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Organizations create, modify, and maintain huge amounts of data to help their businesses earn money and generally function.  Typically every network user within an organization has a bit of disk space to store in process items and personal files.   …
Recently, I had the need to build a standalone system to run a point-of-sale system. I’m running this on a low-voltage Atom processor, so I wanted a light-weight operating system, but still needed Windows. I chose to use Microsoft Windows Server 200…
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

919 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

20 Experts available now in Live!

Get 1:1 Help Now