Network Load Balancing (NLB) is a component in Windows Server operating systems that load balances network traffic (sent to a cluster virtual IP address) among multiple servers in an NLB cluster.

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Using Windows Network Load Balancing for one IP only?

When configuring NLB, you choose the cluster IP. This removes any other secondary IP addresses for the network adapter. How can I have one cluster IP shared by NLB while still having multiple ...
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Moving from a single IIS to a webfarm using NLB with minimal downtime?

Say the IP of our website is 1.1.1.1, and we want to set up NLB, is it best to set 1.1.1.1 as the virtual IP - could mess this up and cause downtime... Better to set the virtual IP as 1.1.1.2, then ...
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677 views

Newbie question on Windows 2008 NLB in unicast mode

I am doing some experiments in NLB using Windows Server 2008 R2 Standard. I have 2 windows machines, each with 2 nics. On each machine, only 1 NIC is used, the other one is not plugged into the ...
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Unable to add a second Windows Server 2008 to a NLB cluster

I am trying to setup a 2-node cluster with NLB on Windows Server 2008 R2 standard. One the first node (node A) I successfully create a cluster containing it. However, when from node A I attempt to ...
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Multiple web servers in a IIS web farm behind a single IP address

I have 4 web servers (Windows Server 2008 R2) and just one public IP address. They all need to be a part of web farm (so the requests for the site are spread over all servers). Two questions: 1) Is ...
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Is it possible to configure Windows Server 2008 Network Load Balancer to balance load based on HTTP methods

I am currently investigating Windows Server 2008 clustering features (for fail-over and load balancing purposes). I am thinking of using NLB to balance HTTP requests to 2 or more web application ...
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424 views

Network Load Balancer, between two standalone computers, user gets access denied on the second member of the cluster

I have set up a few NLB clusters without problems, so far they have been administered with the administrator user. Now I have created a few users who are identical on both members of the cluster, all ...
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821 views

Windows NLB detect dead IIS?

We're running 4 webservers through NLB, however every once in a while a single IIS dies on us (not the Windows, it still works, it's just the IIS returns 503 Service unavailable) Is it somehow ...
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659 views

Uneven load with Microsoft Network Load Balancing (Server 2003)

I am a network administrator at a small company that uses Network Load Balancing (NLB) to cluster our terminal servers together. Recently, we changed our network setup due to PCI-DSS compliance. ...
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Could SQL Server 2008 replication be used with NLB to allow unlimited scaling of reporting servers?

We are currently using transactional replication in SQL Server 2008 to keep a secondary reporting server synchronized with a primary database server. This has been working weel and keeps some of the ...
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NLB Accessed Denied from second server

Have NLB set up and working. Just two servers, web1 and web2. I set up NLB on web1 and can view both machines as Converged. (I had to specify a login/pass to connect to web2). On web2, looking at the ...
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How to replicate wwwroot over multiple IIS web servers with NLB without NAS?

We're adding a second server with Windows NLB for a bit of redundancy (ie the power goes on one of the servers - I know its not the best solution). How can we keep the data identical between the ...
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NLB Port Rules - Load Weight of 100

NLB allows admins to set up a node to handle 100% of the load for a particular port. If that node fails, will no other nodes handle the request because of the port rule?
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683 views

IIS/MSSQL HA on two servers? NLB + Mirroring

We currently have the one server doing MSSQL/IIS. Can use NLB with two servers running IIS for HA and can use database mirroring and put the failover partner in the connection string for HA. Can we ...
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Windows 2008 Server Standard Edition, supports NLB?

Windows 2008 Server Standard Edition, supports NLB?
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Network Load Balancing, intermittent port problem on Windows Server 2008

Trying to troubleshoot an intermittent problem on a Windows Server 2008 NLB. I think it might be related to an NLB issue. We are using Windows Network Load Balancing to balance load for our ...
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Windows Network Load Balancing on ESX Cluster with Dell PowerConnect stacks

We recently switched out our Cisco 6500 core switch for a pair of Dell PowerConnect 6248 stacks. Since then, our Network Load Balanced Sharepoint, which runs on two virtual machines on an ESX cluster ...
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Struggling to set-up NLB cluster

I'm trying to set up NLB on a couple of Windows 2008 R2 virtual servers running on top of Hyper V R2. The servers each have a single vNIC for LAN access (and a second vNIC for SAN access). I'm ...
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Good idea to use NLB for DNS servers?

Is it a good idea to use NLB to load balance DNS requests to primary and secondary dns servers on port 53?
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Updated: NLB 2 Windows Server 2003 Servers - Looking to Hire SysAdmin to solve!

I need to configure windows NLB on 2 dedicated servers I have. My main machine has been running for some time, with several domain names pointing to the servers primary IP address. Both servers have ...
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300 views

How do I know if I set up the network load balancing cluster correctly?

I'm working on a web conference where we are going to show about 12 videos for a total of about half a gig. Since all the participants are going to be watching (and also streaming/downloading) at ...
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229 views

How do I prevent a server from joining the NLB when it starts up?

I have a problematic Windows Server 2003 box (MOSS 2007) that caused problems so we shut it down. When we bring it back up it joins the NLB (one other server) and causes problems. We tried shutting ...
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563 views

SharePoint server planing for redundancy and load balancing

I am looking into SharePoint but have some problems to understand how to plan the servers in order to get good availability at the same time as using load balancing. I have basically planned for the ...
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431 views

Control how requests are distributed on a NLB cluster

We are testing an application on an NLB cluster. We notice that the requests are not being spread evenly between the servers in the NLB cluster. Is there anyway do configure the requests to be ...
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Stop single NLB node at command line

We have a NLB cluster set up for our public web servers. I'm trying to stop the "localhost" in the cluster from the command line using NLB.EXE. When I write "nbl stop" it seems that all nodes are ...
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NLB configuration

I have an NLB configured for two web servers. The NLB is a software NLB configured on Windows Server 2008 R2. The web servers are IIS servers. For a request of 5000 users, all my requests are going to ...
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Unable to access virtual IP after configuring NLB in windows 2008

I have Two webseervers(WS1, WS2). I have added NLB component on both the machines. In WS1, i have added a cluster with IP as (eg:xx.yy.zz.100) and added WS1, WS2 to the same cluster. Now i have ...
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840 views

ISP Load Balancing with ISA 2006

I understand that ISA 2006 has an integrated Network Load Balancing feature. We also recently acquired a second internet line through a second service provider. I know it is possible to purchase a ...
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238 views

Dynamically add Server 2008 NLB Nodes

I have a small NLB cluster for Terminal Servers. One of the things we're looking at doing for this particular project (this is for a college class) is dynamically creating Terminal Servers. What ...
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Can I use NLB to balance multiple sites on the same (n) servers?

I know this is probably a simple question, but I can't seem to find a definitive answer anywhere. We have two servers (Win2K3 SP1) running a single website on IIS 6.0 under NLB. Each server is ...
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Cannot add second host to a Network Load Balance cluster

I am using Network Load Balancing on Windows server 2008. (Servers have two NIC's and the cluster is configured to run in unicast mode) I can configure the cluster on either of the hosts and add the ...
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724 views

MS Network Load Balancing crashes Hyper-V virtual host?

We have a strange problem with an interaction between our Hyper-V virtual host and the hosted virtual servers. Both virtual hosts and virtual servers are running Windows Server 2008. When a virtual ...
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477 views

How much NICs for NLB (ISA-Server) / Best Practice?

I'm not familiar with Windows servers (I'm some kind of networking guy) but have to setup an ISA server from the networking point of view. It will connect an internal LAN to a DMZ. There will be a ...
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Maximum concurrent connections to a Microsoft NLB Cluster

We recently had a problem with maximum conncurrent connections on a Microsoft NLB cluster, that I got an answer to on stackoverflow: ...
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ISA Server NLB and HTTP 403 errors

I have an ISA Server 2006 Enterprise Edition NLB array and, intermittently, users connecting through one of the two servers get an ISA Server 403 (Forbidden) error message: Technical Information (for ...
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Linux equivalent of Windows NLB

With Windows, we can setup load balancing for arbitrary IP services just by installing NLB and selecting which nodes we want in the cluster. It does some MAC address changing, then has algorithms to ...