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[FATAL] [INS-44001] Reachability check failed from the local node node1 to the following nodes


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[FATAL] [INS-44001] Reachability check failed from the local node

[oragrid@node1 grid]$ ./gridSetup.sh  -ignorePrereq -waitforcompletion -silent -noconfig -responseFile si_gi_install.rsp
Launching Oracle Grid Infrastructure Setup Wizard...
[FATAL] [INS-44001] Reachability check failed from the local node node1 to the following nodes:
 []
 These nodes will be ignored and not participate in the configured Grid Infrastructure.
   ACTION: Check the network connectivity from the local node node1 to the remote nodes
 []

Solution

 Enter hostname in /etc/hosts
If entry in /etc/hosts is already present check if there is no typo and IP/Hostname is correct
If DNS is not configured  /etc/hosts should contain the entry for following 

 SCAN
Private Interconnect
Public Interconnect
VIPs

 Example /etc/hosts entries

 # Public
192.9.1.100                          node1.oracle.com                   node1
192.9.1.101                          node2.oracle.com                   node2
192.9.1.105                          storage.oracle.com                 storage
# Private
10.0.0.1                               node1-priv.oracle.com             node1-priv
10.0.0.2                               node2-priv.oracle.com             node2-priv
# Virtual IP
192.9.1.150                         node1-vip.oracle.com               node1-vip
192.9.1.151                          node2-vip.oracle.com              node2-vip
#SCAN
192.9.1.150                         scan.oracle.com                           scan
192.9.1.151                         scan.oracle.com                           scan
192.9.1.152                         scan.oracle.com                           scan

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