Friday, January 23, 2015

Vmware – Cannot ping NLB IP from Different Subnet

Symptoms:-
You can ping all the NLB Host from any subnet but NLB IP cannot ping Different subnet (in same subnet you can ping all the IP including NLB IP)
Check MAC address, for sure you can see different MAC Address for each

How to get MAC Address
Log in different machine which is connected same subnet and ping all three IPs (Host 1 and Host 2 and NLB IP). You can ping all the IP’s without any issue.
After that you can run in same command prompt “ arp –a” (result are below)

How to fix it
Remove all existing NLB configuration
Create New NLB connection in Node 01, with multicasting and Add Node 02
Run        netsh interface ipv4 set interface "NLB" forwarding=enabled

Login Node 02 Server and Add existing NLB Connection (with NLB IP)

Run        netsh interface ipv4 set interface "NLB" forwarding=enabled