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Microsoft NLB cluster through Cisco VPN tunnel

Posted on 2007-11-22
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Last Modified: 2011-09-20
We have 2 Win 2003 servers in a Unicast NLB Cluster.
Each server has it's own IP address and the cluster has it's own IP address.
We have established a Cisco VPN tunnel between and 877 and an 878 router using the SDM interface.

Remotely, we can access each server individually but not by the cluster IP address.
Remotely, we can ping each server but not the cluster IP address.
Locally, everything works fine, and the cluster IP address responds fine.
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Question by:nmxsupport
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by:sabioit
ID: 20340589
Are you pointing the NAT in your firewall to the NLB IP ?
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Expert Comment

by:lrmoore
ID: 20340964
Check the default gateway setting on the cluster IP config
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nmxsupport earned 0 total points
ID: 20518286
I am requesting closure on this question.
After speaking with Cisco there was 2 main issues.
1) the mtu packet size needed to reduced from 1500 on the routers - apparently RDP is affeced by this?I've not heard of this but this got IP working.
2) because RDP was already being natted on the external interface it was not being passed back through the vpn tunnel, we had to add an exception to the natting rules/vpn tunnel to get rdp to return back through the vpn tunnel if it started there.
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by:Vee_Mod
ID: 20532036
Closed, 500 points refunded.
Vee_Mod
Community Support Moderator
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