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RAC addnode.sh gives PRVG-12885 error when MTU size of 65520 is involved (Doc ID 2091782.1)

Last updated on MARCH 02, 2021

Applies to:

Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms


Customer was trying to add a RAC node back into the cluster using the command:

./addnode.sh -silent "CLUSTER_NEW_NODES={node3}" "CLUSTER_NEW_VIRTUAL_ HOSTNAMES={node3-vip}"

But was getting the error:

ERROR:
PRVG-12885 : ICMP packet of MTU size "65520" does not go through subnet "xxx.yyy.8.0".
The command executed was "/bin/ping xxx.yyy.10.5 -c 1 -w 3 -M do -s 65492 ". The output from the command was "PING xxx.yyy.10.5 (xxx.yyy.10.5) 65492(65520) bytes of data.
From xxx.yyy.10.5 icmp_seq=1 Frag needed and DF set (mtu = 16436)

Changes

 Output from

        # dcli -l root -g dbs_group ip addr list | grep ib

shows that all MTU sizes are 65520

 

Output from

        #  ifconfig -a

shows that the MTU size for the loopback interface was 16436

Cause

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