Hi all,

I met a problem when setup DNS server for Oracle RAC two nodes.

I have two machines, I called them is Server_A (node1) and Server_B (node2). OS is RHEL 5.8.

Based on the link :
http://chotustuff.wordpress.com/2012...for-11gr2-rac/

On the Server_A, I created 2 virtual machine - VM (used Oracle VirtualBox): 1 for DNS Server, 1 for Node1. I were setup DNS server and it worked fine. From Node1 VM, I can ping and nslookup to rac-scan on DNS Server.

On the Server_B, I also created 1 virtual machine for Node2. But from Node2, I can't ping to DNS server and use nslookup to rac-scan ! Also, I can't ping to Node1.

But when I copied Node2 VM from Server_B to Server_A (I mean the DNS server VM, Node1 VM and Node2 VM will run on Server_A). And now, from Node2 I can ping to dns server, node1 and use nslookup to rac-scan OK !

I did not knew why ! All of my VMs OS, I used
subnet mask : 255.255.255.0
default gateway: 192.168.1.1
dns server's IP: 192.168.1.30
Node1 and 2 have primary dns is : 192.168.1.30

I can't enough physical memory to run all of VM on Server_A, so I need run Node2 VM on Server_B, but I met some problems as above !

Note: I did not eidted any things after copied Node2 VM from Server_B to Server_A.

Please help me to solve it.

Thanks so much.

Regards,

This is not clear enough for me!

You made DNS server on a virtual environment on first physical server (or computer), and a host on second server (or computer)?

They both share network 192.168.1.0/24 right? what are the ip-addresses of the servers (you dont have to put public ip-addresses for security reasons, but if they use public but just mention it)? are they on the same network (192.168.1.0/24)? or they should communicate through NAT?

Check if they share 192.168.1.0/24 if not than they are not on the same network and should not communicate directly, it is a network design problem, you cant have two different networks with the same ip-se and not communicate between them by NAT.

Let me just let you know that 192.168.1.0/24 is a private network and they should not pas to public networks, but for lab purposes it is ok. if u do NAT and u want to reach your server on UDP port 53, you should do port mapping or something else like one on one NAT.