Cannot get 2 nodes VM talk to each other on OEL7

Greetings-

I intend to install RAC 11 GR 2 on OEL7. I got the Oracle VM operational machines. I can access the internet successfully without any problems. If I'm on the node-1 and ping its IP address, it also works very well.
But when I try to do a ping of virsa node-1 node-2 and vice, I get the message cannot.

Here is my configuration of hots of installation:

[oracle@racdev01 Desktop] $ cat/etc/hosts

Loopback #.

127.0.0.1 localhost.localdomain localhost

# Public

192.168.56.71 racdev01.localdomain racdev01

192.168.56.72 racdev02.localdomain racdev02

# Private

192.168.10.1 racdev01 - priv.localdomain racdev01-priv

192.168.10.2 racdev02 - priv.localdomain racdev02-priv

# Virtual

192.168.56.81 racdev01 - vip.localdomain racdev01-vip

192.168.56.82 racdev02 - vip.localdomain racdev02-vip

# SCAN

192.168.56.91 rac - scan.localdomain rac-scan

192.168.56.92 rac - scan.localdomain rac-scan

192.168.56.93 rac - scan.localdomain rac-scan

Rattling, public and private maintains for lack of node-1 node-2 IPs and vice versa:
$ ping racdev02
$ ping racdev02-priv


> > My network:
Node-1: Ethernet (enpOs8) = > 192.168.56.71 (public)

Node-1: Ethernet (enpOs9) = > 192.168.10.1 (private)

Node-2: Ethernet (enpOs8) = > 192.168.56.72 (public)

Node-2: Ethernet (enpOs9) = > 192.168.10.2 (private)


This is the configuration for my 3 adapters:

Adaptor-1.jpgAdaptor-2.jpgAdaptor-3.jpg


I tried for days to get these 2 nodes to talk with each other. I would really appreciate your help to solve this problem... I can't installing RAC, unless I get these machines talk to each other...

Thank you very much!

@AJ

First of all, thanks to you all for the heads up, I tried your suggestions, which was a good experience of troubleshooting since I am just a DBA not a network Admin however, I solved the problem and I share the solution below.

Initially after a successful installation of OEL7 on Node1, I did not perform a fresh install of OS OEL7 on Node2, instead, I took the short cut by saving Node1 via VM - Box > file > Export device and then reimported into a new host name & configured network connections accordingly. But, since a clone of Node1, Node2 machines will have the same MAC address and so they may never talk to each other because I understand is the address MAC is what distinguishes them from material level.  Now, you should have a good idea what is my problem...

There is a quick fix & fix liked - the longer fix would have been to install a new OEL7 on Node2, the miracle solution is below which I was working with success:

1 I changed my MAC address last 2 digits for all 3 node-2 and make unique cards and not the same addresses MAC on Node1 because they were copied from Node1.

2. to: VM - Box > settings > network > adapter 1 > advanced > change the 2 digits of the MAC address here also with the same 2 numbers I did on step 1

3 step 2 apply for Adapter 2 and 3 of the adapter, but make sure you use the same last 2 numbers you did on step 1 for Adapter 2 and 3 of the adapter

Exp: 1 MAC adapter: 08:00:27:96:72: 85 -adapter 2 MAC: 08:00:27:96:72:86 - 3 MAC adapter: 08:00:27:96:72:87 > Note: they must all be unique and different from MAC @ on Node1

4 on Node2 > Terminal > cd sysconfig / > , you should see, in my view, enp0s3, 8 and 9 may be different numbers according to your configuration. But once you change each of them, you should see a setting called [HWADDR] Exp: mine was: HWADDR = 08:00:27:96:72:84 - then I changed to the same number, I put it in step 1 above - to: HWADDR = 08:00:27:96:72:85.  Apply the same changes &

5 restart services network as follows: service network restart - may have to restart...

6 if everything is done correctly above, you should be able to ping both machines of vice versa - I could

7 nothing succeeds like success! It took me 2 days to understand this point, but it was worth. I learned so much by testing a few things around. The other way is to perform a new installation of OEL7 on Node2, modify the connections accordingly and you don't need to mess with MAC address at all...

I'll be happy to set up a small video or post screenshots so you can see it working.

Please note, I've looked all over youtube BOF CARS on OEL7, most 2 knots BECAUSE I fell on were on OEL6.5 and below. I've seen some autonomous 12 c on OEL7, but no 12 c CARS on OEL7. If there are out there, please post the link. Now, I had 2 machines to talk to each other, I will perform with installation 12 c CARS on OEL7.

See you soon

@AJ

Tags: Database

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