Hi, I have created a NLB for 2 Exchange 2010 CAS/HT roles. I have enabled forwarding (forwarding = enabled) on the NLB network card. The Virutal IP pings only from it's own subnet, but not form outside the subnet. Any help to solve the issue would be greatly appriciated.

Hello, for Exchange question ask them here: http://social.technet.microsoft.com/Forums/en-US/category/exchangeserver For clustering questions, ask them here: http://social.technet.microsoft.com/Forums/en-US/winserverClustering/threads This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator Microsoft Certified IT Professional: Server Administrator

In Addition to Mr X suggestion. Did you try adding static ARP entry. Check this link. Thanks