IIS Web Server NLB IP limitation

We are close to the limit of IP addresses on our IIS Webservers using Microsoft NLB load balancer.

(Server 2008 Std IIS7)

We can have 16 un-load balanced IP addresses on each of the webservers, and 16 load balanced IP address between them.


We have to use a new IP address per client site as SSL is required.

I am looking for a simple solution so we can add more IP addresses.

Can we add a second NIC to each webserver - not part of the load balancing and add additional IP addresses to the extra NIC?

Ideally I would like it to be on the same subnet? - is this possible?

E.g. .  Nic1  192.168.4.x  part of NLB        Nic2  192.168.4.x  not part of NLB.

Failing that we could add Nic2 to be on another subnet  e.g. 192.168.5.x and then add new sites on to this NIC?

is this possible?    The web servers are virtual and so adding additional resources and Nics is not an issue.

thanks in advance.
Spikeuk30Asked:
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Aaron TomoskySD-WAN SimplifiedCommented:
Are these bare metal or virtualized?
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Jian An LimSolutions ArchitectCommented:
yes, it is possible.

Adding additional NIC will not confuse the server.
the MAC address it the key and hopefully the virtual switch wont get confuse ( and i don't see why it will)


Regardless Which Mac address it return eventually, it will hit the same server so technically it won't be an issue
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MaheshArchitectCommented:
NLB can be bound to multiple network adapters, which allows you to configure multiple independent clusters on each host.

https://technet.microsoft.com/en-us/library/cc725691.aspx
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Spikeuk30Author Commented:
Hey there,  I have decided against dual NICs as we were getting DFS replication errors and some SQL reporting tools were failing too, too much of a headache.

Thanks for everyones help.
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Aaron TomoskySD-WAN SimplifiedCommented:
The reason I ask about virtualized is the free esxi from VMware can load balance easily with multiple nics
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